Question

Given alongside is a diagrammatic sketch of the sectional view of a plant part relating to reproduction.
(a) Identify the plant part as a whole.
(b) Name the structural parts numbered 1-5.
(c) Where would it be found as a stage as shown?
(d) What is the function of part 4?
(e) What immediately next happens to the part 5?

Answer 1

a) The given diagram shows generating pollen.

b) 1-Exine

2-Intine

3-Pollen Tube

4-Vegetative nucleus

5-Generative nucleus

c) The stage is found when the pollen reaches a stigma of a flower and the chemical reaction stimulate the tube elongation and subsequent fertilisation.

d) The vegetative nucleus synthesizes the pollen tube.

e) The Generative nucleus bifurcates into two male gametes out of which one fuses with the polar nuclei in triple fusion to form endosperm and the other male nuclei fuse with the egg cell to form the zygote and subsequent embryo.