In plants, exchange of gases takes place through

A. Stomata

B. Palisade tissue

C. Spongy tissue

D. Mid rib

Answer: Option A

Solution(By Examveda Team)

The exchange of oxygen and carbon dioxide in the leaf (as well as the loss of water vapour in transpiration) occurs through pores called stomata (singular = stoma). Normally stomata open when the light strikes the leaf in the morning and close during the night.

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Ozone hole refers to

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C. decrease in thickness of ozone layer in stratosphere

D. increase in the thickness of ozone layer in troposphere