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(vii) comes out of pollen grain to transfer male gametes to the ovary.
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Solution
Pollen tube comes out of pollen grain to transfer male gametes to the ovary.
Once the pollen grain lands on the stigma, one of the pollen grains forms a pollen tube and the pollen tube grows through the stigma and style to reach the ovary.
The pollen tube releases two sperm nuclei.
One of the sperm nucleus fuses with the egg cell to form the zygote.
Another, fuses with the two polar nuclei to form the endosperm.