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Byju's Answer
Standard VII
Biology
Modifications of Leaf
From the foll...
Question

From the following statement, select the correct statements.
A. Carbon dioxide taken in through stomata is used in photosynthesis.
B. Oxygen taken in through stomata is used in respiration.
C. Water vapour taken in through stomata is used in transpiration.

A
A and B
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B
A and C
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C
B and C
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D
A, B and C
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Solution

The correct option is A A and B
Photosynthesis is a process in which green plant forms their food in presence of light and during this process oxygen gas is evolved. Respiration is a process in which living organism take oxygen from the atmosphere and in the cell, this oxygen is used for oxidation of food to produce energy and carbon dioxide is evolved through this mechanism. Transpiration is the evaporative loss of water by plants. it occurs mainly through the stomata in the leaves. Thus, the correct answer is option A.

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Q. Case: Transpiration is the evaporative loss of water by plants. It occurs mainly through the stomata in the leaves. Besides the loss of water vapour in transpiration, exchange of oxygen and carbon dioxide in the leaf also occurs through pores called stomata. Normally stomata remain open during the day and close at night.

Based on the above case answer the following question:

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options.
Q. Case: Transpiration is the evaporative loss of water by plants. It occurs mainly through the stomata in the leaves. Besides the loss of water vapour in transpiration, exchange of oxygen and carbon dioxide in the leaf also occurs through pores called stomata. Normally stomata remain open during the day and close at night.

Based on the above case answer the following question:

Which of the following statements is not true for stomatal apparatus?

Q. Case: Transpiration is the evaporative loss of water by plants. It occurs mainly through the stomata in the leaves. Besides the loss of water vapour in transpiration, exchange of oxygen and carbon dioxide in the leaf also occurs through pores called stomata. Normally stomata remain open during the day and close at night.

Based on the above case answer the following question:

Which of the following is not a purpose of transpiration?
Q.

Assertion : Less than 1% of the water reaching the leaves is used in photosynthesis and plant growth.

Reason: Most of the water is lost through the stomata in leaves by transpiration


Q.

Which of the following options is correct based on the statements given?

Statement 1: Gaseous exchanges in plants usually occur on the top side of leaves.

Statement 2: Tiny pores called stomata to facilitate this exchange.

Statement 3: The exchange of water vapour and carbon dioxide takes place through stomata.


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