Given below is a diagrammatic representation of the process of fertilization. Study the same and then answer the questions that follows :
(a) Name the parts labeled 1,2,3,4, 5 and 6.
(b) What happens to (i) Ovary (ii) Ovule after fertilization?
(c) What is the function of the synergids?
(d) What part does the stigma play in the process of fertilization?
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(a) The labelings are as follows :
1 – Style
2 – Pollen tube
3 – Polar nuclei
4 – Embryo sac
5 – Antipodal cells
6 – Micropyle
(b) The following are the changes that occur after fertilization :
(i) Ovary – It enlarges for the formation of fruit. The ovarian wall goes on to form the fruit wall.
(ii) Ovule – Develops to become the seed.
(c) Function of synergids –
* It nourishes the egg cell thereby guiding the pollen tube towards the egg.
* Ensures proper functioning of the pollen tube.
* Responsible for the release of the sperm nuclei.
(d) Role of stigma –
During pollination, pollen grain is transferred to the stigma. Pollen grains are germinated only in the event of it falling on the stigma. Post germination, the pollen tube grows through the stigma, reaching the ovary in order for the egg cell to be fertilized.
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