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  4. Just before the process which produces zygote and primary endosperm nucleus, both the male gametes are present in

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Q. Just before the process which produces zygote and primary endosperm nucleus, both the male gametes are present in

NTA AbhyasNTA Abhyas 2020

Solution:

The pollen grain has a tube cell which forms the pollen tube after pollination. It also has a generative cell, which undergoes mitosis to produce two non-motile male gametes, which are then carried to the embryo sac, guided by the secretions from synergids. Once it reaches the embryosac, the pollen tube ruptures releasing the two male gametes in the embryo sac and cause double fertilization.