Pollen grain germinates when it lands on the stigma of the flower of the same species, A pollen tube grows as enzymes are produced to break down the tissues of the stigma and style., The pollen tube enters the ovary of the flower via an opening called the micropyle., The male gamete will be released within the ovule. The nucleus of the male gamete then fuses with the nucleus of the female gamete to form a zygote (fertilisation)..

Pollination and fertilisation

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