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

The water proof layer that protects human skin.

Which one of the following is the by-product gas of photosynthesising ?

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

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

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

The respiratory system of insects is called:

Fish gills are covered by a bony flap called:

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

The branchioles end in millions of tiny interconnected cavities called: