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  • Explain why sexual reproduction in angiosperms is said to take place through double fertilisation and triple fusion Also draw a labelled diagram of embryo sac to explain the phenomena

Explain why sexual reproduction in angiosperms is said to take place through double fertilisation and triple fusion. Also, draw a labelled diagram of embryo sac to explain the phenomena.

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In the process of double fertilisation in the case of angiosperms; one male gamete fuses with the female gamete, and the second male gamete fuses with the secondary nucleus. This fusion of the male and female gametes results in the outcome of the zygote. The fusion between the second male gamete and the secondary nucleus results in the outcome of the primary endosperm nucleus. Since the occurrences of fusion of two nuclei take place, thus it is called double fertilisation. The following figures show double fertilisation:

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