NCERT Solutions for Class 7 Science Curiosity Chapter 10: Life Processes in Plants by PW

Plants may appear stationary, but several essential processes continuously take place within them. Making food, exchanging gases, transporting water and nutrients, and releasing energy are all necessary for plant growth and survival.

Understanding these processes can be challenging when questions involve photosynthesis, respiration, starch formation, food transport through phloem or water movement through the plant. Experiments involving sunlight, iodine solution, sealed test tubes and temperature also require you to connect observations with the underlying concepts.

The  NCERT Solutions Class 7 Science Curiosity Chapter 10 provide clear answers to the multiple-choice questions from Life Processes in Plants. They explain photosynthesis, respiration, food storage and transport, the functions of leaves, starch testing, water transportation and the connection between photosynthesis and respiration.

Class 7 Science Curiosity Chapter 10 NCERT Solutions

The following solutions cover questions based on photosynthesis, respiration, food transport and other essential life processes in plants.

1. What are the raw materials required by plants for photosynthesis?

A) Glucose and Oxygen
B) Carbon dioxide, Water, and Sunlight (in the presence of chlorophyll)
C) Oxygen, Water, and Energy
D) Carbon dioxide and Glucose

Answer: B) Carbon dioxide, Water, and Sunlight (in the presence of chlorophyll)

Plants require carbon dioxide and water for photosynthesis. Sunlight provides the energy needed for the process, while chlorophyll helps capture light energy.

2. What are the end products of photosynthesis in plants?

A) Glucose and Oxygen
B) Carbon dioxide and Water
C) Glucose, Carbon dioxide, and Energy
D) Oxygen and Water only

Answer: A) Glucose and Oxygen

During photosynthesis, plants use carbon dioxide and water in the presence of sunlight and chlorophyll to produce glucose and release oxygen.

3. What are the raw materials used during cellular respiration in plants?

A) Carbon dioxide and Water
B) Sunlight and Chlorophyll
C) Glucose and Oxygen
D) Starch and Water

Answer: C) Glucose and Oxygen

Glucose reacts with oxygen during cellular respiration. This process releases energy for various activities within plant cells.

4. What products are generated during respiration in plant cells?

A) Glucose and Oxygen
B) Carbon dioxide, Water, and Energy
C) Oxygen and Energy
D) Starch and Water

Answer: B) Carbon dioxide, Water, and Energy

Respiration breaks down glucose in the presence of oxygen and releases energy. Carbon dioxide and water are produced during the process.

5. What would be the immediate impact on Earth if all photosynthetic organisms disappeared?

A) Carbon dioxide levels would drop to zero.
B) Food production and oxygen generation would stop, causing food chains to collapse.
C) Animals would produce their own glucose.
D) Respiration rates in animals would double.

Answer: B) Food production and oxygen generation would stop, causing food chains to collapse.

Photosynthetic organisms are major producers of food and oxygen. Their disappearance would seriously affect food chains and the availability of oxygen.

6. Food synthesised in the leaves as glucose is converted into which sugar form for transport through the phloem?

A) Starch
B) Sucrose
C) Cellulose
D) Fructose

Answer: B) Sucrose

Glucose produced during photosynthesis is converted into sucrose, which is transported through the phloem to different parts of the plant.

7. In storage organs like potatoes, in what form is food stored?

A) Glucose
B) Sucrose
C) Starch
D) Chlorophyll

Answer: C) Starch

Plants commonly store excess food in the form of starch. Potatoes are examples of storage organs containing stored starch.

8. Why does the broad and flat structure of leaves make photosynthesis more efficient?

A) It increases the surface area to absorb sunlight and contains stomata for gas exchange.
B) It helps the leaf store large amounts of starch directly.
C) It prevents water from evaporating during warm weather.
D) It converts carbon dioxide directly into proteins.

Answer: A) It increases the surface area to absorb sunlight and contains stomata for gas exchange.

The broad surface of a leaf allows it to receive more sunlight. Leaves also have stomata that allow gases such as carbon dioxide and oxygen to move in and out.

9. In the respiration equation: Glucose + Oxygen → Carbon dioxide + Z + Energy, what does Z represent?

A) Chlorophyll
B) Sunlight
C) Water
D) Sucrose

Answer: C) Water

Water is one of the products formed during aerobic respiration, along with carbon dioxide and energy.

10. What happens to the leaves of a plant kept in a completely dark room for several days?

A) They turn dark green and grow rapidly.
B) They become pale or yellow, and the plant grows weak.
C) They produce high amounts of starch.
D) They start releasing excess oxygen.

Answer: B) They become pale or yellow, and the plant grows weak.

Without light, the plant cannot carry out normal photosynthesis effectively. Over time, its leaves may become pale or yellow and the plant may become weak.

11. If a leaf from a plant kept in sunlight is tested with iodine solution, what result will be observed?

A) No colour change
B) It turns pale yellow
C) It turns blue-black due to the presence of starch
D) It turns bright red

Answer: C) It turns blue-black due to the presence of starch

Iodine solution turns blue-black when starch is present. A leaf exposed to sunlight can produce food through photosynthesis and store it as starch.

12. Which two conditions are strictly essential for a plant to generate starch and release oxygen during photosynthesis?

A) Darkness and Water
B) Sunlight and Carbon dioxide
C) Oxygen and Soil
D) Carbon dioxide and Dark room

Answer: B) Sunlight and Carbon dioxide

Sunlight provides the energy required for photosynthesis, while carbon dioxide is one of the substances used by plants during the process.

13. In an experiment with a sealed test tube containing only a water snail in light, why does the carbon dioxide level increase?

A) The snail carries out photosynthesis.
B) The snail respires and releases carbon dioxide.
C) Water turns into carbon dioxide automatically.
D) The snail absorbs oxygen to convert it to glucose.

Answer: B) The snail respires and releases carbon dioxide.

The snail carries out respiration and releases carbon dioxide. In a sealed test tube, the released carbon dioxide accumulates, causing its level to increase.

14. How does temperature affect the rate of water transportation in plants?

A) Water transport is faster in cold conditions.
B) Water transport is faster in warm conditions.
C) Temperature has no effect on water transport.
D) Water transport stops completely in sunlight.

Answer: B) Water transport is faster in warm conditions.

In warmer conditions, water loss through transpiration generally increases, which can increase the movement of water through the plant.

15. How do photosynthesis and respiration together maintain the balance of oxygen and carbon dioxide in the atmosphere?

A) Both processes release carbon dioxide into the air.
B) Photosynthesis consumes oxygen and respiration produces oxygen.
C) Photosynthesis uses carbon dioxide and releases oxygen, while respiration uses oxygen and releases carbon dioxide.
D) Respiration produces glucose, which absorbs carbon dioxide from plants.

Answer: C) Photosynthesis uses carbon dioxide and releases oxygen, while respiration uses oxygen and releases carbon dioxide.

Photosynthesis and respiration have complementary roles in the movement of oxygen and carbon dioxide. Photosynthesis takes in carbon dioxide and releases oxygen, while respiration uses oxygen and releases carbon dioxide.

NCERT Solutions for Class 7 Science Curiosity Chapter 10 PDF

Revising plant processes becomes easier when important questions and answers are available together. The Class 7 Science Curiosity Chapter 10 Solutions PDF includes questions on photosynthesis, respiration, starch, food transport, water movement and plant-based experiments.

NCERT Class 7 Science Chapter 10 Solutions by PW: What Can You Learn?

From making food in leaves to moving water through different parts, plants carry out several processes that are essential for their growth and survival. The NCERT Class 7 Science Chapter 10 Solutions by PW helps you understand these concepts through clear explanations and question-based learning. Key areas covered include:

• Understand Photosynthesis: Learn how plants prepare food using carbon dioxide, water and sunlight.

• Explore Plant Respiration: Understand how glucose and oxygen help release energy in plant cells.

• Learn About Food Transport: Understand how sucrose moves through the phloem to different parts of the plant.

• Understand Food Storage: Learn how excess food is stored as starch in parts such as potatoes.

• Explore the Role of Leaves: Understand how leaf structure, including its broad surface and stomata, supports photosynthesis and gas exchange.

• Learn About Starch Testing: Understand how iodine solution helps identify starch in leaves.

• Understand Water Transport: Learn how water moves through plants and how temperature can affect this process.

• Connect Photosynthesis and Respiration: Understand how these two processes contribute to the exchange of oxygen and carbon dioxide.

A closer look at plants reveals how each process contributes to keeping them alive and functioning. The NCERT Class 7 Science Chapter 10 Solutions make these ideas easier to revise by covering textbook questions on food formation, respiration, transport and storage. Regular practice can help children connect these concepts and answer application-based questions with greater clarity.

Related Resources

• CBSE Class 7 Science Syllabus

• CBSE Class 7 Science NCERT Solutions

• CBSE Class 7 Science Sample Papers

• CBSE Class 7 Science Notes