In a stem which is covered by periderm and in which stomata are absent, gaseous exchange takes place

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6.Anatomy of Flowering Plants

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In a stem which is covered by periderm and in which stomata are absent, gaseous exchange takes place through

Bulliform cells

Lenticels

Pneumatophores

Trichomes

Solution

Lenticels are lens-shaped breathing pores.
Bulliform cells are modified epidermal cells which reduce transpirational loss during water stress in monocots.
Pneumatophores are negatively geotropic roots of marsh plants for oxygen intake.
Trichomes are multicellular stem hairs which reduce transpiration by covering the surface.

Standard 11

Biology