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?

Given the exact location of interstitial cells.

What is hydrotropism? Give one example.

Make a Punnett square for finding out the proportion of different genotypes in the progeny of a genetic cross between a pure tall (TT) pea plant with a pure dwarf (tt) pea plant.