'A' forms the outer portion of the kidney and 'B' form the inner portion of the kidney. Name A and B.

Study the diagram given below and answer the questions that follows.

(a) Name the parts labelled 1, 2 and 3 in the diagram.

(b) Mention the collective terms for the membranes covering the brain.

(c) What is the function of cerebrospinal fluid?

Give differences between passive transport and active transport.

What is hydrotropism? Give one example.