Question

Ans with explanation

Answer 1

Answer : Pollen-pistel interaction ; L.S. Carpel during fertilisation.

Labelling :-

A - Pollen grain

B - Pollen tube

C - Ovary

D - Zygote

E - Ovule

Explanation : Pollen grains which fall on the stigma, which leads to growth of a tube called pollen tube which later leads to fusion.

Detailed Explanation : One of the male gametes move towards the egg cell and fuses, which leads to the formale or a diploid cell called the zygote and the phenomenon is called syngamy.

The other make gamete fuses with the two plar nuclei and thus produce PEN ( Primary Endosperm Nucleus ) which is triploid and this phenomenon is called triple fusion.

This phenomena which includes both syngamy and triple fusion is termed as double fertilisation and thus the zygote ( formed as a result of syngamy ) develops into an embryo and the central cell ( formed as a result of triple fusion ) develops into endosperm.

Note : The ovule which becomes the seed after fertilisation, contains both diploid parent tissue and haploid embryo sac tissue.

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