Life Processes in Plants Class 7 Extra Questions and Answers Science Chapter 10

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Class 7 Science Chapter 10 Life Processes in Plants Extra Questions

Class 7 Science Chapter 10 Extra Questions on Life Processes in Plants

Life Processes in Plants Class 7 Very Short Question Answer

Question 1.
What happens to the height of a plant as it grows?
Answer:
It increases.

Question 2.
Where is starch produced in plants?
Answer:
Leaves.

Question 3.
What type of energy does chlorophyll capture?
Answer:
Sunlight.

Question 4.
Which gas do plants take in for photosynthesis?
Answer:
Carbon dioxide.

Question 5.
What is the main food produced in photosynthesis?
Answer:
Glucose.

Question 6.
Where do plants absorb water from?
Answer:
Soil.

Question 7.
What do farmers add to the soil for better plant growth?
Answer:
Manure (mineral nutrients).

Question 8.
Is starch a carbohydrate?
Answer:
Yes.

Question 9.
What are the tiny openings on leaves called?
Answer:
Stomata.

Question 10.
Name the raw materials required for photosynthesis.
Answer:
Carbon dioxide, water, sunlight, and chlorophyll.

Life Processes in Plants Class 7 Short Question Answer

Question 1.
Describe two changes you can observe in a growing plant.
Answer:
As a plant grows, new leaves and branches emerge, its height increases, and its stem thickens.

Question 2.
Why is sunlight important for plants?
Answer:
Sunlight is essential for plants to produce food through photosynthesis.

Question 3.
Explain what is starch and where it is produced in plants.
Answer:
Starch is a type of carbohydrate that plants produce and store as food, and it is produced in the leaves.

Question 4.
Write the word equation for photosynthesis.
Answer:
Carbon dioxide + Water → Glucose + Oxygen (in the presence of Sunlight and Chlorophyll).

Question 5.
Name the gas that plants take in from the airfor photosynthesis and the gas they release.
Answer:
Plants take in carbon dioxide and release oxygen.

Question 6.
What is glucose, and what happens to it after photosynthesis?
Answer:
Glucose is a simple carbohydrate (sugar) produced during photosynthesis, and it is later converted into starch for storage.

Question 7.
How do plants obtain nutrients from the soil?
Answer:
Plants absorb nutrients from the soil along with water through their roots.

Life Processes in Plants Class 7 Long Question Answer

Question 1.
Write the differences between photosynthesis and respiration.
Answer:

Feature	Photosynthesis	Respiration
Definition	The process by which green plants make their own food using sunlight.	The process by which all living organisms break down food to release energy.
Raw materials	Carbon dioxide + Water	Glucose (food) + Oxygen
Products formed	Glucose + Oxygen	Carbon dioxide + Water
Oxygen	Oxygen is produced	Oxygen is used.
Carbon dioxide	Carbon dioxide is used	Carbon dioxide is released.

Question 2.
Why is photosynthesis im¬portant for other living beings, not just plants?
Answer:
Photosynthesis is essential because it produces oxygen, which is required by all animals and humans for breathing. It also produces food (glucose). Without photosynthesis, there would be no food or oxygen, making life on Earth impossible.

Question 3.
How do plants exchange gases with the atmosphere?
Answer:
Plants exchange gases with the atmosphere through tiny openings mostly in their leaves, called stomata. Plants take in carbon dioxide through the stomata, which is used for photosynthesis, and release oxygen as a byproduct.

Question 4.
What did Rustom Hormusji Dastur contribute to our understand¬ing of photosynthesis?
Answer:
Rustom Hormusji Dastur, an Indian scientist, studied the process of photosynthesis. He investigated the effects of factors like water amount and temperature on photosynthesis.

Question 5.
What are the functions of roots in plant nutrition?
Answer:
Roots perform several impor¬tant functions:

• Absorb water and minerals from the soil.
• Anchor the plant in the ground.
• Store food in some plants like sweet potato, carrot and beetroot.
• Water and minerals absorbed by roots are transported to the leaves through xylem vessels, where they are used in photosynthesis.

Question 6.
A student says that plants get their food directly from the soil. Explain why this statement is only partially correct. What is the complete process by which plants obtain their food? (NCERT Exemplar)
Answer:

• The statement is partially correct because plants do absorb essential nutrients and water from the soil through their roots, which are vital for growth.
• However, plants do not get their food directly from the soil in the form that they use it.
• The complete process involves photosynthesis, which occurs in the leaves.
• During photosynthesis, plants use sunlight, water absorbed from the soil, and carbon dioxide from the air to produce glucose (sugar), their food.
• Therefore, while the soil provides necessary raw materials, plants manufacture their own food.

Question 7.
Design a simple experiment to show that sunlight is needed for starch production in leaves. Briefly describe the steps and the expected result. (NCERT Exemplar)
Answer:

• Steps: Take a potted plant and keep it in the dark for a day. Cover a part of one leaf with black paper. Place the plant in sunlight for a few hours. Test the leaf for starch using iodine.
• Expected Result: The part of the leaf exposed to sunlight will show the presence of starch (blue-black colour with iodine), while the covered part will not.

Question 8.
“Leaves are food factories of plants.” Justify this statement in your own words. (NCERT Exemplar)
Answer:

• Leaves are called food factories because they are the primary sites where photosynthesis occurs.
• During photosynthesis, leaves use sunlight, water, and carbon dioxide to produce glucose (food) for the plant.
• This process sustains the plant’s growth and energy needs.

Question 9.
What is Neera, and who conducted research on it?
Answer:
Neera is a nutritive drink made from the sap of the coconut palm, and Kamla Sohonie research highlighted Neera as a cheap and nutritious drink, helping improve the health of poor communities.

Life Processes in Plants Class 7 Case Based Questions

I. Some plants have leaves that are not entirely green; they may have red, yellow, or purple patches.

Answer the following questions:

Question 1.
Do these leaves still perform photosynthesis ?
Answer:
Yes, these leaves can still perform photosynthesis.

Question 2.
Explain your answer.
Answer:
Even though they have other colours, these leaves often contain chlorophyll, the green pigment necessary for photosynthesis. The other pigments may mask the green colour, but chlorophyll is still present and functional.

II. A farmer observes that his crop is growing slowly and the leaves are pale.
He wants to improve the growth of his plants.

Answer the following questions:

Question 1.
What are the two main things the farmer could add to the soil to help his plants?
Answer:
The farmer could add manure and fertilizers to the soil.

Question 2.
Why would adding these things help?
Answer:
Manure and fertilizers provide essential nutrients to the soil, which plants absorb through their roots. These nutrients are necessary for healthy growth and can improve the colour and vigour of the plants.

Life Processes in Plants Extra Questions for Practice

Very Short Answer Type Questions

Question 1.
What is the function of stomata in leaves?

Question 2.
What happens to the colour of a leaf when iodine is added to it, if starch is present?

Question 3.
Which tissue helps water and minerals travel from roots to leaves?

Question 4.
Which part of the plant is known as the ‘food factory’?

Question 5.
Which tissue helps transport of food in plants?

Short Answer Type Questions

Question 1.
In which part of the plant does photosynthesis primarily occur?

Question 2.
What do farmers add to the soil, and why?

Question 3.
What is photosynthesis?

Question 4.
What happens when a green leaf

Long Answer Type Questions

Question 1.
Why is water important for plants? Give at least three reasons.

Question 2.
How does the structure of a leaf * help in photosynthesis?

Question 3.
What would happen if all plants stopped performing photo-synthesis?

Question 4.
A plant is growing tall but has yellow leaves. What two things could you do to help it become healthy again? Explain why these actions would be helpful. (NCERT Exemplar)

Question 5.
Explain why a plant in a dark room will eventually die, even if it is watered regularly.

Case/ Source Based Questions

Question 1.
A teacher sets up an experiment with a green plant in a sealed jar. Inside the jar is a small container with a substance that absorbs carbon dioxide. The jar is placed in sunlight. After a few hours, the teacher tests a leaf from the plant for the presence of starch.
(a) Why was the substance that absorbs carbon dioxide placed in the jar?
(b) What would be the result of the starch test on the leaf, and what does it indicate?

Question 2.
A student, Priya, is growing two potted plants. She waters both plants regularly. However, one plant is kept in a sunny location on the windowsill, while the other is kept in a dark closet. After a few weeks, Priya finds that the plant in the closet has developed yellow leaves, while the plant on the windowsill remains green and healthy.

(a) Why did the plant in the closet develop yellow leaves?
(b) What process was affected in the plant kept in the dark?
(c) What does the healthy green colour of the plant on the windowsill indicate?

Multiple Choice Questions (MCQs)

Choose the correct option in the following questions:

Question 1.
What is the role of xylem in plants?
(a) Transport of food
(b) Transport of water and minerals
(c) Production of oxygen
(d) Reproduction

Question 2.
Which of the following is not required for photosynthesis?
(a) Sunlight
(b) Water
(c) Oxygen
(d) Chlorophyll

Question 3.
Plants make food through a process called:
(a) Digestion
(b) Respiration
(c) Germination
(d) Photosynthesis

Question 4.
What is the green pigment in leaves called?
(a) Haemoglobin
(b) Chlorophyll
(d) Starch
(d) Iodine

Question 5.
Which part of the plant prepares food?
(a) Roots
(b) Stems
(c) Leaves
(d) Flowers

Assertion-Reason Questions

Directions: Each of the questions (i) and (ii) contain two statements – first ‘Assertion’ and second ‘Reason’. Select the correct answer to these questions from the codes (a), (b), (c) or (d) as given below:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

(i) Assertion (A): Plants take in oxygen for photosynthesis.
Reason (R): Photosynthesis produces glucose.

(ii) Assertion (A): Stomata help in the exchange of gases.
Reason (R): Stomata are present in the roots.

Fill in the blanks

(i) Farmers add __________ to the soil to replenish nutrients.

(ii) __________ is produced in the leaves of a plant.

(iii) Plants take in __________ from the air for photosynthesis.

(iv) The presence of starch in a leaf can be tested using __________ solution.

(v) The process of food making in plants requires sunlight, water, carbon dioxide, and __________.

True or False

State whether True or False and answer with reason

(i) Plants need oxygen to perform photosynthesis.
(ii) Photosynthesis produces car¬bon dioxide as a by product.
(iii) During respiration, plants take in oxygen and release carbon dioxide.
(iv) Plants make their own food using carbon dioxide, water, and sunlight.
(v) A plant kept in the dark for several days will not produce starch.

Match the following:

Question 1.
Match the following items given in Column A with that in Column B:

Column A	Column B
(a) Photosynthesis	(i) Carbon dioxide, water, sunlight
(b) Respiration	(ii) Makes food in leaves
(c) Starch	(iii) Energy release process
(d) Raw materials for photosynthesis	(iv) Stored food in plants