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.

An outline sketch of a tree is shown in a diagram below. Study the same and answer the questions that follows.

(a) Name the phenomenon labelled A in diagram.

(b) Explain phenomenon 'A'.

(c) Give one significance of phenomenon 'A'.

Given the exact location of interstitial cells.

Give differences between passive transport and active transport.