Gas Exchange in plants

From summary questions

two similarities between an insect and a leaf

both rely on specialised RESPIRATORY surfaces eg. the stomata and the spiracles. This provides large surface area for gas exchange.

Secondly both processes are driven by diffusion

Two differences between an insect and a leaf

they differ anatomically, insects have spiracles on their exoskeleton, plants have stomata on the underside of the leaf

Secondly, the mode of transport differs. In plants gases diffuses through the air spaces within the leaf and the surrounding atmosphere.

Whereas in insects, oxygen enters form the spiracles transported through the network of trachael tubes to reach internal tissues. This network directly delivers oxygen and removes co2 by diffusion through external surfaces.

Advantage of plants able to close their stomata

reducing excessive water loss especially in water limiting areas.

secondly defence against pathogens.

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