When a pollen grain falls on theâ¦Pâ¦of a flower of the same kind, it develops a long, narrow tube called â¦Qâ¦. It grows down wards through theâ¦Râ¦towards the ovary. Theâ¦Sâ¦are inside the pollen tube. When the tip of the pollen tube reaches the ovary, it opens and the male gametes enter the ovule. The male gamete then unites with theâ¦Xâ¦to form theâ¦Y...This is known asâ¦Zâ¦

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P - Stigma, Q â Male gametes, R - Pollen tube, S - Zygote, X - Style, Y - Egg, Z - Fertilisation

P - Pollen tube, Q - Zygote, R - Stigma, S - Style, X - Male gametes, Y - Egg, Z - Fertilisation

P - Pollen tube, Q - Stigma, R - Male gametes, S - Style, X - Zygote, Y - Egg, Z - Fertilisation

P - Stigma, Q â Pollen tube, R - Style, S - Male gametes, X - Egg, Y - Zygote, Z - Fertilisation

answer is A.

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Detailed Solution

When a pollen grain falls on the stigma of a flower of the same kind, it develops a long, narrow tube called pollen tube. It grows down wards through style towards the ovary. The male gametes are inside the pollen tube. When the tip of the pollen tube reaches the ovary, it opens and the male gametes enter the ovule. The male gamete then unites with the egg to form the Zygote. This is known as fertilisation.

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