Plants exchange water with environment through structures by two cells

Lenticles

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Hydathodes

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Stomata

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Solution

The correct option is B Stomata
Plants exchange gas and water vapour with the environment through tiny pores in the epidermal layer of leaf called stomata. Each stoma is guarded by a pair of specialized cells called guard cells, that regulates the opening and closing of stomata based on various environmental conditions. Here, CO $_{2}$ and O $_{2}$ diffuses in and out of leaves through stomata. Through this, water can evaporate as well and this process is known as transpiration.
So, the correct answer is option C.

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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.

Assertion (A): Avicennia roots are erect, peg like structures with numerous pores through which air circulates.
Reason (R): These roots are seen above the ground for the purpose of gaseous exchange called as breathing roots, or pneumatophores.

Which structures in the leaves of plants are responsible for exchange of oxygen and carbon dioxide?

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