The branchioles end in millions of tiny interconnected cavities called:

The respiratory system of insects is called:

Insects have a protective layer that covers their skin called:

Percentage of oxygen present in the atmosphere.

Gases are diffused in and out of leaves through small openings called stomata. A stomata is surrounded by two cells called:

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

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

Name the openings in the tracheal system of insects.

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 ?