15.9.5 Sexual Reproduction in Flowering Plants (Structured Question 1 & 2)

Question 1:
Diagram below shows a longitudinal section of the reproductive parts of a flower during fertilization.

On the Diagram, name the structures J, K, L and M.

In the space below, draw a section through the ovule, showing all the cells in M.
(b)(ii) What is the significance of having two K structures in the fertilization?

In the Diagram, the structure Y has to be kept dormant for future research purposes.
(i) Explain how Y can be prevented from germinating.
(ii) If Y is to be germinated, suggest one method to stimulate the germination of Y.

J : Pollen tube
K : Male gamete
L : Ovary
M : Embryo sac


– One K/ male gamete fertilizes an egg cell to form a diploid zygote.
– One more K fuses with two polar nuclei to form a triploid zygote.

– Keep Y in a dry place
– Moisture initiates germination

Spraying a sugary solution onto Y

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