Human kidney is a complex organ. Kidneys receive blood through blood vessels which directly branch from the Aorta. Inside each kidney are tiny functional units which filter the blood.

(a) Name the blood vessels that supply blood to the kidneys.

(b) Which are the functional units that filter the blood?

Divya performed an experiment on photosynthesis. At the end of the experiment, she tested the experimental leaf for the presence of starch. During the starch test she first boiled the leaf in water and then in methylated spirit.

(a) Why did she boil the leaf in water?

(b) Mention the reason why she then boiled the leaf in methylated spirit.

Write the overall chemical equation for photosynthesis.

Name the structure responsible for each of the following:

(a) Conversion of mechanical sound waves to sound vibrations in the human ear.

(b) Maintaining equal air pressure on either side of the tympanum.