photosynthesis class 7 icse mcq

reduced coelomic cavity

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• MCQ On Photosynthesis

MCQ on Photosynthesis

Photosynthesis is the process by which plants, algae and some bacteria use sunlight, carbon dioxide and water to prepare their food. This is a biogeochemical process in which light energy is converted into chemical energy.

Photosynthesis takes place in the chloroplast. The chlorophyll present in the chloroplast traps the light from the sun and carries out the process.

Photosynthesis MCQs

1. Photosynthesis occurs in

• Chloroplast
• Endoplasmic reticulum

2. The optimum temperature for photosynthesis is

Also Read: Photosynthesis

3. Photorespiration occurs in

• Four cell organelles
• Two cell organelles
• One cell organelle
• Three cell organelle

4. Reduction of NADP occurs in

• Oxidative photophosphorylation
• Cyclic photophosphorylation
• Non-cyclic photophosphorylation

5. Kranz anatomy is found in the leaves of

Also Read: Light Reaction

6. Peroxisomes are involved in which type of reactions

• Calvin cycle
• Glyoxylate cycle
• Glycolate cycle
• Bacterial photosynthesis

7. Photorespiration involves oxidation of

• Chlorophyll a
• Both a and b

8. C3 and C4 plants differ with respect to

• Number of ATP molecules consumed
• First product
• The substrate which accepts carbon dioxide

Also Read: Photorespiration

9. In Calvin cycle, 1 molecule of glucose is formed from

• 6CO 2 + 30ATP + 12NADPH
• 6CO 2 + 12ATP
• 6CO 2 + 18ATP + 12NADPH
• 6CO 2 + 18ATP + 30NADPH

10. Where does the light reaction takes place?

11. Electrons from the excited chlorophyll molecules of PS-II are first accepted by

• Cytochrome f
• Cytochrome b

Also Read: Electron Transport Chain

12. Non-cyclic photophosphorylation results in the production of

• ATP and NADPH

13. DCMU inhibits

• Oxidative phosphorylation
• It destroys chloroplast

Also Read: Glycolysis

14. Maximum photosynthesis occurs in

• White light
• Green light

15. The first acceptor of CO 2 in C4 plants is

• Aspartic acid
• Oxaloacetic acid
• Phosphoenolpyruvate

16. The first product of C4 pathway is

• Oxaloacetate

Also Read: TCA cycle

17. The two pigment system theory of photosynthesis was proposed by

18. H 2 donor during photosynthesis is

Also Read: Photosynthesis in Higher Plants

19. The minerals involved in splitting reaction during photosynthesis is

• Potassium and manganese
• Magnesium and chlorine
• Potassium and chlorine
• Manganese and chlorine

20. The water-soluble photosynthetic pigment is

• Xanthophyll
• Anthocyanin
• Chlorophyll b

Also Read: Calvin cycle

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Photosynthesis

Class 7 - living science biology ratna sagar, check your progress.

Green plants make their own food by the process of respiration.

Corrected statement — Green plants make their own food by the process of photosynthesis.

The glucose produced during photosynthesis is transported from the leaves to other parts of the plant.

Carbon dioxide is released as an end product during photosynthesis.

Corrected statement — Oxygen is released as an end product during photosynthesis.

Stomata are present mostly on the upper surface of leaves and on green stems.

The rate of photosynthesis increases with an increase in the concentration of carbon dioxide.

Tick the most appropriate answer

Plants make their own food by a process called

• respiration

photosynthesis

Reason — The process by which plants make their own food is called photosynthesis

During the process of photosynthesis, plants use energy from the

Reason — Plants convert the energy of sun into chemical energy of food (glucose)

The green pigment present in leaves is called

• chlorophyll
• chloroplast
• chromoplast
• anthocyanin

Reason — The green pigment present in leaves is called chlorophyll which is present in chloroplasts

Small pores on the lower surface of leaves are called

Reason — Stomata are small openings on the leaves present mostly on the lower surface of leaves and on green stems.

Each stoma has two bean-shaped cells called

guard cells

Reason — Each stomata has two bean-shaped cells called guard cells. They regulate the opening and closing of stomata.

When the guard cells lose water, they lose their turgidity and the stomata

• remains same

Reason — When the guard cells lose their turgidity, their inner walls come closer and the stomata closes.

If the colour of a leaf changes to blue-black when a few drops of iodine are added to it, then it shows the presence of

Reason — Iodine changes the colour of leaf to blue-black showing the presence of starch and thus shows the photosynthesis in that leaf.

The optimum temperature at which the photosynthesis occurs best is around

Reason — The optimum temperature range for photosynthesis is 20°C to 40°C.

Fill in the blanks

All organisms need ............... to live and grow.

All organisms need energy to live and grow.

Animals get their food from ............... and other animals.

Animals get their food from plants and other animals.

The ............... produced during photosynthesis is transported from the leaves to the other parts of the plant.

The glucose produced during photosynthesis is transported from the leaves to the other parts of the plant.

The inner walls of the guard cells are ............... than the outer walls.

The inner walls of the guard cells are thicker than the outer walls.

............... absorbs light.

Chlorophyll absorbs light.

The rate of photosynthesis ............... with an increase in the concentration of carbon dioxide.

Answer these questions in short

Where do living organisms obtain energy from?

The living organism obtain energy from the food they eat. Animals get their food from plants and other animals. Plants on the other hand, make their own food by the process of photosynthesis.

How do green plants make their own food?

Green plants make their own food by the process of photosynthesis. Plants convert carbon dioxide and water into glucose in presence of light and chlorophyll.

How is glucose stored in plants?

The glucose is converted into starch and stored in various storage organs within the plant.

What happens when the guard cells are full of water?

When the guard cells are full of water, they swell and bulge outwards and the stomata opens.

Can plants make food in the absence of light? Why?

Light is very important for photosynthesis. In the absence of light, plants cannot make their food. Light energy is required to convert raw materials of photosynthesis into glucose.

Answer these questions in detail

Explain photosynthesis. Represent photosynthesis using a word equation.

The process by which green plants use energy from the sun to convert carbon dioxide and water into glucose in the presence of green-coloured pigment (chlorophyll) is called photosynthesis. Plants obtain carbon dioxide from the atmosphere through stomata and water is absorbed by the roots from the soil. The process of photosynthesis involves following steps:

• Water taken up by the root system and carbon dioxide from the atmosphere reaches the leaves.
• Light is absorbed by chlorophyll, which splits water (called photolysis) and oxygen is released. This reaction depends on sunlight for activation energy. It takes place in the thylakoids of the chloroplasts.
• Carbon dioxide splits and this carbon is used to make sugars. This reaction does not require light energy. It occurs in stroma.
• Sugars are formed and they combine to form complex sugars. Glucose and fructose are formed as a result of photosynthesis.

Photosynthesis can be represented by the following word equation:

Carbon dioxide + water → chlorophyll sunlight \xrightarrow[\text{chlorophyll}]{\text{sunlight}} sunlight chlorophyll ​ Glucose + Oxygen

Write a short note on stomata.

Small openings on the leaves present mostly on the lower surface of leaves and on green stems are called stomata. Each stoma has two bean-shaped cells called guard cells. The inner walls of the guard cells are thicker than the outer walls. When the guard cells are full of water, they swell and bulge outwards and the stomata opens. When the guard cells lose water, they lose their turgidity and the stomata closes. Normally stomata remains open during the day and closes at night. Stomata have following functions:

• Exchange of gases (carbon dioxide and Oxygen)
• Transpiration (loss of water from the plant surface)

Explain any three factors that affect photosynthesis.

Following are the three factors that affect photosynthesis:

• Light — Light energy trapped by the chlorophyll is used to convert raw materials into sugar. The rate of photosynthesis also depends on the intensity of the light, higher the intensity of light higher is the rate of photosynthesis.
• Chlorophyll — It is found in structures called chloroplasts. It enables the plant to trap light energy.
• Temperature — The series of chemical reactions occurring during photosynthesis can take place only at a suitable temperature, the optimum being between 20°C to 40°C.

How will you test the presence of starch in green leaves?

To test the presence of starch in green leaves, following steps are followed:

• Pluck a leaf from a plant which has been exposed to sunlight for a few hours.
• Put it in a test tube containing alcohol. Place the test tube in a beaker containing water and heat the water. As the alcohol begins to boil, the chlorophyll dissolves in it and the leaf becomes pale.
• Remove the leaf from alcohol and wash it in warm water.
• Lay the leaf in a dish and put a few drops of iodine on it.

We will observe that the colour of the leaf changes to blue-black. This shows that starch is present in the leaf.

How will you show that chlorophyll is necessary for photosynthesis?

To show that chlorophyll is necessary for photosynthesis, we will conduct following experiment:

• Select a plant with variegated leaves. Chlorophyll is present in the green portion.
• Put the plant in sunlight for a few hours.
• Pluck any leaf and draw its rough outline indicating the green and non-green portions.
• put the leaf in dilute iodine solution.

We observe that the portion of leaf with chlorophyll turns blue-black showing the presence starch. This shows that photosynthesis took places only in the green part of leaf. Thus, chlorophyll is necessary for photosynthesis.

Write a short note on the significance of photosynthesis.

The process of photosynthesis is of extreme importance as it is the source of food as well as oxygen for all animals directly or indirectly. Food is produced by the process of photosynthesis. Leaves capture light energy from the sun and use it to make food. Animals that feed on the plants get this energy. They pass it on further when they are eaten by other animals. The energy obtained from food is used by all organisms for various metabolic activities. All living organisms require oxygen. This oxygen is released by the plants during photosynthesis. In the absence of photosynthesis, the oxygen level in the atmosphere would decrease and life on earth would become impossible.

Look at the picture and answer the questions that follow

• What does this picture show?
• Where are these structures found in a plant?
• What are their functions?
• The given picture shows Stomata.
• They are found on the lower surface of leaves and on green stems.
• Their functions are exchange of gases (carbon dioxide and oxygen) and transpiration.
• Identify the activity for which this set is required.
• Which liquid is being added to the leaf?
• What happens to the part of leaf covered with black paper? What does this indicate?
• It is used to show that light is necessary for photosynthesis.
• Iodine solution is added to the leaf.
• The part of the leaf covered with the black paper does not turn blue-black after adding iodine solution. This indicate that there is no starch formed in that area since no photosynthesis took place because that area of leaf was kept devoid of light. Hence, this activity proves that light is essential for photosynthesis.

Think and answer

We make our own food in the kitchen. This means that humans are also autotrophs. Do you agree?

No, we are not autotrophs. Autotrophs are the organisms that are capable to convert solar energy into food. We can cook food produced by plants but cannot produce it like autotrophs.

Can animals make food from carbon dioxide, water and sunlight like plants do? Why?

No, animals cannot make food from carbon dioxide, water and sunlight like plants do because they do not have chlorophyll and the mechanism to trap light energy and convert it into food. Hence, animals are not capable of performing photosynthesis to make their own food.

Selina Concise Biology Class 7 ICSE Solutions – Photosynthesis and Respiration

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ICSESolutions.com provides step by step solutions for Selina Concise ICSE Solutions for Class 7 Biology. You can download the Selina Concise Biology ICSE Solutions for Class 7 with Free PDF download option. Selina Publishers Concise Biology for Class 7 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.

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Selina Concise ICSE Solutions for Class 7 Biology Chapter 4 Photosynthesis and Respiration

• The process of preparing or synthesising food using water from the soil and carbon dioxide from the air, together chlorophyll and sunlight is called photosynthesis .
• Photosynthesis occurs in the mesophyll cells of the leaf. These cells contain numerous plastids called chloroplasts.
• With in the plastids is present the green pigment called chlorophyll.
• On the lower surface of the leaf are numerous pores called stomata , which open into small air cavities inside the leaf.
• Stomata are tiny openings found mainly on the lower surface of leaves. These openings are surrounded by a pair of bean¬shaped cells called guard cells.
• All plants have a transport system called vascular system. It is composed of two types of tissues called xylem and phloem.
• Glucose (C 6 H 12 O 6 )
• The energy released during respiration is stored as chemical energy in the form of ATP — adenosine tri-phosphate.
• Aerobic respiration — C 6 H 12 O 6 +6O 2  →   6CO 2 +6H 2 O+38ATP Anaerobic respiration — C 6 H 12 O 6  →  2C 2 H 5 OH+2CO 2 +2ATP
• During vigorous exercise, the cells respire anaerobically and form lactic acid which accumulate in the muscle cells causing fatigue and pain.

• The respiratory organs of the fish are gills.
• Transpiration is the loss of water in the form of water vapour from the aerial parts of the plant.
• Transpiration occurs through stomata.
• Temperature
•  Maintain the concentration of the sap inside the plant body.
• Causes cooling effect

Review Questions

Multiple Choice Questions 1. Put a tick (✓ ) against the most appropriate alternative in the following statements. (i) Carbohydrates are stored by plants in the form of: (a) Vitamins (b) Proteins (c) Fats (d) Glucose 

(ii) Stomata are present on the surface of: (a) Leaves (b) Roots (c) Stem (d) Flower petals

(iii) Which one of the following is an end-product of photosynthesis ? (a) Fructose (b) Glucose (c) Cellulose (d) Lactose

Short Answer Questions

1. Why do leaves generally look green ? Answer: The green colour of a leaf is due to the presence of chlorophyll.

2. Which four of the following are needed for photosyn-thesis in a leaf: (i) Carbon dioxide: (ii) Oxygen: (iii) Nitrates : (iv) Water: (v) Chlorophyll: (vi) Soil: (vii) Light: Answer: (i) Carbon dioxide: from air (iv) Water: from soil (v) Chlorophyll: contained in leaf (vii) Light: from sunlight

3. What is the source of energy for photosynthesis ? Answer: Light is the ultimate source of energy in photosynthesis because plants take in the sunlight CO 2 and H 2 O and converts it into glucose.

4. Which gas is taken in and which one is given out by the leaf in bright sunlight ? (i) Taken in : (ii) Given out: Answer: (i) Carbon dioxide (ii) Oxygen

6. State whether the following statements are True or False: (i) Green plants prepare their food by using two raw materials, oxygen and water. False. Green plants prepare their food by using raw materials, CO, chlorophyll and water. (ii) The chlorophyll enables the plants to use light energy.  True (iii) The free oxygen in the atmospheric air is the result of photosynthesis.  True (iv) Photosynthesis occurs only in chlorophyll-containing parts of the plant. True

7. Differentiate between aerobic and anaerobic respiration. Write the overall chemical equations of the two kinds of respiration in plants. (i) Aerobic: (ii) Anaerobic: Answer: Aerobic respiration

• It occurs in the presence of oxygen.
• Here there is complete breakdown of glucose releasing carbon-di-oxide, energy. water and energy.
• More energy is released (38 ATP).

Anaerobic respiration

• It occurs in the absence of oxygen.
• There is partial breakdown of glucose into ethyl alohol, carbon-di-oxide and
• Lesser energy is released (2 ATP).

• Anabolic process
• Food is produced here.
• Oxygen is by-product.
• Chlorophyll and sunlight are required.
• Occur only during daytime.
• Occurs in green plants only.

Respiration

• Catabolic process
• Food is broken down form here to release energy
• Carbon-di-oxide is the by-product.
• Chlorophyll and sunlight are notrequired.
• Occurs all the time
• Occurs in all living beings including plants.

Respiration:

C 6 H 12 O 6 +6O→6CO 2 +6H 2 0+energy

Question 9.  Do the plants respire all day and night or only during the night ? Answer: The plants respire only during the night. Plants take in oxygen and give out carbon dioxide. Hence, there is some truth in the belief that one should not sleep under the trees at night.

Question 10.  What happens to the energy liberated during respiration? Answer: The energy liberated during respiration is utilised for carrying out various life processes. Some of the energy liberated during the breakdown of 03 the glucose molecule, is in the form of heat, but a large part of it is converted into chemical energy called Adenosine Triphosphate (ATP). Any activity inside the cell is carried out by the energy released by these ATP molecules.

Long Answer Questions

Question 1. In order to carry out photosynthesis, what are the substances that a plant must take in ? Also mention their sources. Answer: For preparing food, the plants require the following :

• Water (from soil)
• Carbon dioxide (from air)
• Chlorophyll (contained in the leaf)
• Energy (from sunlight)

Question 2.  What is the role of chlorophyll in photosynthesis ? Answer: This pigment is of utmost importance as it absorbs the sunlight which provides energy for the process of photosynthesis occurs inside the chloroplast of the leaf.

Question 3. Do plants need oxygen ? If so, what is its source ? Answer: Yes plants need oxygen, all the free oxygen in the atmospheric air is the result of photosynthesis. No animal can survive without oxygen as it is needed for respiration. Even the plants use the same oxygen in dark for their own respiration.

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Photosynthesis and Respiration ICSE Class-7th Concise Selina Biology Solutions

Photosynthesis and Respiration ICSE Class-7th Concise Selina Biology Solutions Chapter-4 .We Provide Step by Step Answer of Objective, True False , Fill in the blanks , Match the following , Short/Long Answer Type of Exercise-4 Photosynthesis and Respiration. Visit official Website  CISCE    for detail information about ICSE Board Class-7.

Photosynthesis and Respiration ICSE Class-7th Concise Selina Biology Solutions Chapter-4

Review Questions 

Multiple Choice Questions

1. put a tick (✓ ) against the most appropriate alternative in the following statements..

(i) Carbohydrates are stored by plants in the form of: (a) Vitamins (b) Proteins (c) Fats (d) Glucose .

(ii) Stomata are present on the surface of: (a) Leaves (b) Roots (c) Stem (d) Flower petals

(iii) Which one of the following is an end-product of photosynthesis ? (a) Fructose (b) Glucose (c) Cellulose (d) Lactose

Short Answer Questions ( Photosynthesis and Respiration ICSE Class-7th )

Question 1..

Why do leaves generally look green ? Ans. The green colour of a leaf is due to the presence of chlorophyll.

Question 2.

Which four of the following are needed for photosyn-thesis in a leaf: (i) Carbon dioxide: (ii) Oxygen: (iii) Nitrates : (iv) Water: (v) Chlorophyll: (vi) Soil: (vii) Light:

Ans. (i) Carbon dioxide: from air (iv) Water: from soil (v) Chlorophyll: contained in leaf (vii) Light: from sunlight

Question 3.

What is the source of energy for photosynthesis ? Ans. Light is the ultimate source of energy in photosynthesis because plants take in the sunlight CO 2  and H 2 O and converts it into glucose.

Question 4.

Which gas is taken in and which one is given out by the leaf in bright sunlight ? (i) Taken in : (ii) Given out: Ans. (i) Carbon dioxide (ii) Oxygen

Question 5.

Suppose we compare the leaf with a factory, match the items in Column A with those in Column B. Column A          Column B

Question 6.

State whether the following statements are True or False: (i) Green plants prepare their food by using two raw materials, oxygen and water. False.  Green plants prepare their food by using raw materials, CO, chlorophyll and water. (ii) The chlorophyll enables the plants to use light energy.  True (iii) The free oxygen in the atmospheric air is the result of photosynthesis.  True (iv) Photosynthesis occurs only in chlorophyll-containing parts of the plant. True

Question 7.

Differentiate between aerobic and anaerobic respiration. Write the overall chemical equations of the two kinds of respiration in plants. (i) Aerobic: (ii) Anaerobic:

Aerobic respiration

• It occurs in the presence of oxygen.
• Here there is complete breakdown of glucose releasing carbon-di-oxide, energy. water and energy.
• More energy is released (38 ATP).

Anaerobic respiration

• It occurs in the absence of oxygen.
• There is partial breakdown of glucose into ethyl alohol, carbon-di-oxide and
• Lesser energy is released (2 ATP).

(i) Aerobic respiration:

Question 8.

 Explain how photosynthesis is different from respiration.

 different between Photosynthesis and respiration.

photosynthesis

• Anabolic process
• Food is produced here.
• Oxygen is by-product.
• Chlorophyll and sunlight are required.
• Occur only during daytime.
• Occurs in green plants only.

Respiration

• Catabolic process
• Food is broken down form here to release energy
• Carbon-di-oxide is the by-product.
• Chlorophyll and sunlight are notrequired.
• Occurs all the time
• Occurs in all living beings including plants.

Photosynthesis :

Question 9.

 Do the plants respire all day and night or only during the night ? Answer: The plants respire only during the night. Plants take in oxygen and give out carbon dioxide. Hence, there is some truth in the belief that one should not sleep under the trees at night.

Question 10.

 What happens to the energy liberated during respiration? Answer: The energy liberated during respiration is utilised for carrying out various life processes. Some of the energy liberated during the breakdown of 03 the glucose molecule, is in the form of heat, but a large part of it is converted into chemical energy called Adenosine Triphosphate (ATP). Any activity inside the cell is carried out by the energy released by these ATP molecules.

Long Answer Questions ( Photosynthesis and Respiration ICSE Class-7th )

In order to carry out photosynthesis, what are the substances that a plant must take in ? Also mention their sources.

For preparing food, the plants require the following :

• Water (from soil)
• Carbon dioxide (from air)
• Chlorophyll (contained in the leaf)
• Energy (from sunlight)

The process of preparing or synthesising food using water from the soil and carbon dioxide from the air, together chlorophyll and sunlight is called photosynthesis. This entire process is a series of complex chemical reactions Photosynthesis is represented as follows:

What is the role of chlorophyll in photosynthesis ? Answer: This pigment is of utmost importance as it absorbs the sunlight which provides energy for the process of photosynthesis occurs inside the chloroplast of the leaf.

Do plants need oxygen ? If so, what is its source ? Answer: Yes plants need oxygen, all the free oxygen in the atmospheric air is the result of photosynthesis. No animal can survive without oxygen as it is needed for respiration. Even the plants use the same oxygen in dark for their own respiration.

— : end of Photosynthesis and Respiration Solutions :–

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Selina solutions for Concise Biology Class 7 ICSE chapter 4 - Photosynthesis and Respiration [Latest edition]

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Solutions for chapter 4: photosynthesis and respiration.

Below listed, you can find solutions for Chapter 4 of CISCE Selina for Concise Biology Class 7 ICSE.

Selina solutions for Concise Biology Class 7 ICSE Chapter 4 Photosynthesis and Respiration Review questions

Put a tick (✓ ) against the most appropriate alternative in the following statement.

Carbohydrates are stored by plants in the form of:

Put a tick (✓ ) against the most appropriate alternative in the following statement. 

Stomata are present on the surface of:

Flower petals 

Which one of the following is an end-product of photosynthesis?

Lactose 

Short answer question.

Why do leaves generally look green?

Which four of the following are needed for photosynthesis in a leaf: (i) Carbon dioxide: (ii) Oxygen: (iii) Nitrates : (iv) Water: (v) Chlorophyll: (vi) Soil: (vii) Light: 

What is the source of energy for photosynthesis?

Which gas is taken in and which one is given out by the leaf in bright sunlight?  

(i) Taken in : (ii) Given out:

Suppose we compare the leaf with a factory, match the items in Column A with those in Column B.

State whether the following statement is True or False: 

Green plants prepare their food by using two raw materials, oxygen and water.

The chlorophyll enables the plants to use light energy.

The free oxygen in the atmospheric air is the result of photosynthesis.

State whether the following statement is True or False:  

Photosynthesis occurs only in chlorophyll-containing parts of the plant. 

Differentiate between aerobic and anaerobic respiration. 

Write the overall chemical equations of the two kinds of respiration in plants. 

(i) Aerobic: (ii) Anaerobic: 

Explain how photosynthesis is different from respiration.  

Do the plants respire all day and night or only during the night?

What happens to the energy liberated during respiration?

Long answer question.

In order to carry out photosynthesis, what are the substances that a plant must take in? Also mention their sources.

What is the role of chlorophyll in photosynthesis?

Do plants need oxygen? If so, what is its source?

Selina solutions for Concise Biology Class 7 ICSE Chapter 4 Photosynthesis and Respiration Additional questions

Answer this question.

What is external respiration?

Write the equation showing the process of respiration.

In what form is the energy released during respiration stored?

Name the two types of respiration.

Name the organ of respiration in fishes.

What are the holes on the sides of the body of insects called?

Answer the following in one word.  

What is the muscular sheet below the lungs called?

Answer the following in one word. 

Which organ is called the voice box?

Which membrane covers the lungs? 

Answer the following in one word.

Where does the exchange of gases take place? 

What is formed when oxygen combines with hemoglobin?

What is carbamino hemoglobin?

Selina solutions for Concise Biology Class 7 ICSE Chapter 4 Photosynthesis and Respiration Exercises

Tick the most appropriate answer. 

 The products of respiration are :

carbon dioxide and oxygen

oxygen and energy

carbon dioxide, water, and energy

carbon dioxide, oxygen, and energy.  

Glucose is oxidized to produce ethyl alcohol during

aerobic respiration

anaerobic respiration

photosynthesis 

In insects like grasshopper, there is a well-developed system of air tubes called

alveoli 

Frogs breathe through the

mouth cavity

all of these 

Inside the chest, the trachea divides into two branches called

bronchioles

alveolus 

Tick the most appropriate answer.  

In humans beings, during inhalation the diaphragm.

remains at its position

moves down moves up 

Exhaled air contains

more carbon dioxide

more oxygen

more nitrogen

more hydrogen 

Plants have these for the exchange of gases.

spiracles and stomata

lenticels and spiracles

lenticels and stomata 

buds and flowers

Fill in the blank.  

The two respiration of respiration are ................ and................... 

Fill in the blank. 

Muscles of human beings switch to anaerobic ...................... in the absence of oxygen.

 In .................. respiration, food is completely oxidized into carbon dioxide, water, and energy.

Below the lungs is a muscular sheet called ........................

Bronchi divide into smaller tubes called .....................

In human beings, the exchange of gases takes place in .................... (lungs).

State if the following statement is true or false. Correct the statement if it is false. 

The oxidation of food to release energy and water is called breathing.

Anaerobic respiration takes place in our bones. 

State if the following statement is true or false. Correct the statement if it is false.

The microscopic air sacs present in the lungs are called bronchi. 

State if the following statement is true or false. Correct the statement if it is false.   

Respiration that takes place through the skin is called pulmonary respiration.  

Stomata are present on mature roots and woody stems. 

In photosynthesis, oxygen is released as a by-product

Match the following. 

Differentiate between 

External respiration and Internal respiration 

Photosynthesis and Respiration

Answer the following in short.

Define respiration. 

What is the full form of ATP? 

What is the respiratory tract? 

Define cutaneous respiration?

What is the function of pleural fluid? 

What is the role of the diaphragm in breathing mechanism?

Answer the following in detail.

How is the process of cellular respiration different from breathing?

Explain the process of Cellular Respiration.

In human beings, what happens to oxygen after it is inhaled through the nose? 

Show the mechanism of breathing in human beings.

Explain the process of the exchange of gases in plants. 

Number the following organs in the correct order to show the path taken by fresh air at the time of inhalation. trachea, nose, bronchioles, bronchi, larynx, alveoli, pharynx, lungs

Selina solutions for Concise Biology Class 7 ICSE chapter 4 - Photosynthesis and Respiration

Shaalaa.com has the CISCE Mathematics Concise Biology Class 7 ICSE CISCE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Selina solutions for Mathematics Concise Biology Class 7 ICSE CISCE 4 (Photosynthesis and Respiration) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.

Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. Selina textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.

Concepts covered in Concise Biology Class 7 ICSE chapter 4 Photosynthesis and Respiration are Photosynthesis: Food-Making Process in Plants, Chlorophyll: The Vital Plant Pigment, Regulation of Stomatal Opening for Letting in Carbon Dioxide, Process of Photosynthesis, Factors Affecting Photosynthesis, End Result of the Products of Photosynthesis, Significance of Photosynthesis, Plastid, Autotrophic Nutrition, Mode of Nutrition in Plant, Respiration and Photosynthesis, Respiration, Types of Respiration: Aerobic and Anaerobic Respiration, Respiration in Plant.

Using Selina Concise Biology Class 7 ICSE solutions Photosynthesis and Respiration exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Selina Solutions are essential questions that can be asked in the final exam. Maximum CISCE Concise Biology Class 7 ICSE students prefer Selina Textbook Solutions to score more in exams.

Get the free view of Chapter 4, Photosynthesis and Respiration Concise Biology Class 7 ICSE additional questions for Mathematics Concise Biology Class 7 ICSE CISCE, and you can use Shaalaa.com to keep it handy for your exam preparation.

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Selina Concise Biology Class 7 ICSE Solutions Chapter 4 Photosynthesis and Respiration

Selina publishers concise biology class 7 icse solutions chapter 4 photosynthesis and respiration.

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• Concise Biology Class 7 ICSE Solutions for Chapter 4 - Photosynthesis and Respiration

ICSE Class 7 Biology Chapter 4 Selina Concise Solutions - Free PDF Download

Updated ICSE Class 7 Biology Chapter 4 - Photosynthesis and Respiration Selina Solutions are provided by Vedantu in a step-by-step method. Selina is the most famous publisher of ICSE textbooks. Studying these solutions by Selina Concise Biology Class 7 Solutions which are explained and solved by our subject matter experts will help you in preparing for ICSE Exams. Concise Biology Class 7 ICSE Solutions can be easily downloaded in the given PDF format. These solutions for Class 7 ICSE will help you to score good marks in ICSE Exams 2024-25.

The updated solutions for Selina textbooks are created following the latest syllabus. These are provided by Vedantu in a chapter-wise manner to help the students get a thorough knowledge of all the fundamentals.

ICSE Class 7 Biology Chapter 4 Selina Concise Solutions

A summary of class 7 chapter 4: photosynthesis and respiration.

Chapter 4 of class 7 biology aims to educate students about the method and process by which plants produce their foods and take in oxygen to give out carbon dioxide i.e., photosynthesis and respiration respectively. The chapter focuses on teaching the students about the definition, factors affecting, significance, etc. of the two above-mentioned processes. The chapter engages in various illustrations and demonstrative exercises to teach the students of class 7 Photosynthesis and the difference between the process of breathing and the process of making food in plants. The chapter discusses the end products of the process of photosynthesis i.e., glucose and oxygen and introduces students to the types of respiration that plants undergo: Anaerobic and Aerobic respiration.

 The second part of the chapter focuses on the concept of respiration and how different animals have adapted to different methods of breathing air in and out of their bodies. The students are also taught about the factors which affect the rate of transpiration such as sunlight, temperature, wind, and humidity. The last part of the chapter briefly discusses transpiration which is the process of respiration in plants.

The Syllabus for Class 7 ICSE Biology

Biology can be a tough subject for students who are not able to understand the concepts behind the topics being taught. However, it is a subject that is important to be learned by the students of class 7 as it teaches them about the environment that they live in. Therefore, to make the subject a bit easier to study, students must plan and be aware of the topics that they will be studying. To do so, knowing the subject can be very helpful. The syllabus for class 7 ICSE board Biology is divided into 8 chapters. The concepts of these seven chapters can be broadly classified into four units: Tissues, Kingdom Classification, Plant Life, and Human Body. The names of the eight chapters that are a part of the Class 7 Biology Syllabus are:

Plant and Animal Tissues

Classification of Plants

Classification of Animals

Photosynthesis and Respiration

Life Processes: Ingestion, Digestion, Absorption, and Assimilation

Excretion in Humans

Nervous System

FAQs on Concise Biology Class 7 ICSE Solutions for Chapter 4 - Photosynthesis and Respiration

1. What is the difference between Photosynthesis and Respiration?

The primary difference which is there between the process of photosynthesis and transpiration is that photosynthesis is the process by which plants acquire energy for other processes while transpiration can be defined simply as the process by which plants breathe. Photosynthesis can be defined more broadly as the process by which plants take in atmospheric carbon dioxide and then convert it into a more complex form of an organic compound such as sugar by using energy from the sunlight and releasing oxygen. 

2. How many Chapters are there under the Human Physiology Unit in the Class 7 ICSE Syllabus for Biology?

Under Unit 3 of class 7 Biology syllabus for the ICSE board, there are a total of 4 chapters, making it the largest unit containing the most of the marks for the final exam. These four chapters included in the Human Physiology unit are Excretion in Humans, Nervous System, Life Processes, and Allergy. This unit is important as it helps students to get to understand their bodies better and know how certain systems of the bodywork perform the daily activities that we do such as eating food and excreting. 

3. Where can I download the ICSE Class 7 Solutions for Chapters of Biology?

Students can download the class 7 ICSE Solutions for all chapters of class 7 biology from the Vedantu website or the app. The solutions provided on the Vedantu website not only cover all subjects of all classes from class 6 to 12 but also include the complete syllabus and therefore all the chapters. These solutions can help students save some time if they are stuck on a question with doubt and also help them understand the topic a bit better. All the students have to do is register on the Vedantu website and then download any solutions they want. 

4. What are the benefits of referring to Vedantu’s Solutions for Class 7 ICSE Selina Concise Biology?

The solutions provided by the Vedantu website or the app have several advantages that work in the favor of the students and help them score better in their exams. A few benefits of referring to the Vedantu solutions for ICSE Concise Selina publishers are given below:

The answers are very precise and to the point, therefore making it extremely easy for the students to understand. 

These solutions are accurate and therefore reliable for the students to refer to for their exam preparations.

Vedantu solutions are laid out in a systematic step-by-step method so that students can easily follow the answers without getting confused. 

The answers are created by subject matter experts who follow the latest guidelines by the ICSE board and the CISCE. 

5. What are the most important concepts in Chapter 4 of Class 7 ICSE Biology ‘Photosynthesis and Respiration?

The chapter Photosynthesis and Respiration from the class 7 ICSE syllabus is an important one that discusses the essential processes by which plants give out oxygen and breathe respectively. Some of the most important concepts of this chapter are given below:

Difference between photosynthesis and transpiration

Significance and need for photosynthesis

Products of photosynthesis

Difference between anaerobic and aerobic respiration

Diagram of stomata and chlorophyll with labeling

These topics hold the most importance in chapter 4 of the Biology syllabus and therefore it is very likely that they might appear in the final exam. 

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Photosynthesis mcq test - Class 7

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Biology - Photosynthesis & Respiration i...

5th - 7th grade.

Biology - Photosynthesis & Respiration in plants (Class 7th)

10 questions

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Which process takes place during day time in plants ?

Photosynthesis

Respiration

Exotheremic

All of the above

What is needed for the process of photosynthesis ?

CO2, H2O, sunlight and chlorophyll.

What is not required during respiration in plants ?

Where does respiration in plants takes place ?

Cytoplasm and mitochondria

Which of these respiration takes place in plants ?

Aerobic respiration

Anaerobic respiration

Where can be lenticels present ?

When does stomata close and opens ?

When sunlight needed

When lack of Glucose

When it loses water it closes and when it is filled with water it opens

When it is cut

How many ATP molecules are released during aerobic respiration ?

What you will do to proof that Carbon dioxide is released during respiration?

Take conical flask with boiled seeds inside and a lime water filled brake and put the rubber cork on flask and a glass tube and wait until it turns gelatinous white.

Take a conical flask with germinating seeds inside and a limewater filled beaker and put the rubber cork on flask and put a glass tube and wait until it turns milky white.

Take a conical flask with dry leaf inside and a water filled beaker and put a rubber cork on flask and put a glass tube and wait until it smells like rotten eggs.

Name the structure ?

None of the above

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Classification of Animals Class 7 ICSE Biology MCQ Questions

a) Vertebrates b) Invertebrates

a) Porifera b) Platyhelminthes

a) Nematoda b) Coelenterata

a) Tapeworms b) Ascaris

11.) ____ is a segmented worm.

a) Hydra b) Earthworm

14.) ____ have three pairs of jointed legs.

a) Insecta b) Arachnida

a) Arachnida b) Insecta

20.) ____ move with the help of a muscular foot.

26.) Fishes swim with the help of ____.

28.) Toad is an example of ____.

a) Snakes b) Lizards

a) Reptilia b) Aves

39.) The body of ____ is covered with feathers.

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