Which part of the organism across around which the gas exchange takes place ?

In large organisms, such as humans, the ratio of surface area to volume is:

The respiratory system of insects is called:

Give an example of small organism in which the ratio of surface area to volume is high.

Name the openings in the tracheal system of insects.

Carbon dioxide and oxygen diffuse in and out of leaves through small openings called:

Write the name of the process of stomatal opening and closure.

Large amount of water vapour are lost from leaves by which of the following process ?

The most numerous cells in the epithelium of the bronchus and bronchioles are called:

Insects have a protective layer that covers their skin called: