Guard cells are present outside the ____________.

Stomata

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Hydathode

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Lenticel

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Pneumatophore

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Solution

The correct option is A Stomata
Guard cells are the cells present outside the stomata and regulate the opening and closing of the stomatal pore.
Hydathode, lenticels and pneumatophores are unregulated openings.
Hydathodes are pores through which guttation occurs.
Lenticels are lens-shaped opening in woody trunks for gaseous exchange.
Pneumatophores are pores in negatively geotropic roots of halophytes plants growing in swamps like mangrove vegetation.
Thus, the correct answer is (A).

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