Name the process of loss of water in the form of vapour from the aerial parts of the plants.

Why is transpiration important for plants?

$(a)$ Draw a sectional view of the human heart and label on it Aorta,Pulmonary arteries,Vena cava,Left ventricle.
$(b)$ Why is double circulation of blood necessary in human beings?

List the three kinds of blood vessels of the human circulatory system and write their functions in tabular form.

Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

Explain why transportation of materials is necessary in animals.