Draw the L.S of kidney and label the parts.

The Master chemists of our body are the kidneys. Justify.

i) Kidneys filter all chemicals in the body.

ii) Kidneys maintain the chemical composition of blood.

iii) Kidneys eliminate all chemicals absorbed by the body.

iv) Kidneys store the chemicals accumulated in the body.

Observe the chart depicting the structure of a nephron.

i) Mention the structures A to F

ii) Explain the main function of a nephron.

With a suitable diagram, describe the structure and functions of the human heart.

What is adaptation? Mention the adaptations found in the following mammals.

a) Whale b) Polar bear

c) Kangaroo d) Herbivorous mammals.