(i) The ...a... help in maintaining the press | vedclass

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(B) $(i)$ Companion cells are specialized parenchyma cells associated with sieve tube elements in the phloem. They maintain the pressure gradient in t

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$a$ - Companion cells,$b$ - Transpiration

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(B) $(i)$ Companion cells are specialized parenchyma cells associated with sieve tube elements in the phloem. They maintain the pressure gradient in the sieve tubes by loading and unloading sugars,which creates osmotic potential differences.$(ii)$ Stomata are small pores present on the epidermis of leaves. They regulate the process of transpiration (loss of water vapor) and the exchange of gases like $O_2$ and $CO_2$ between the plant and the atmosphere.

$(i)$ The ...$a$... help in maintaining the pressure gradient in the sieve tubes.
$(ii)$ Stomata regulate the process of ....$b$..... and gaseous exchange.

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$(i)$ The ...$a$... help in maintaining the pressure gradient in the sieve tubes.$(ii)$ Stomata regulate the process of ....$b$..... and gaseous exchange.