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Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYSexual Reproduction in Flowering Plants3 Marks
Question
What does an interaction between pollen grains and its compatible stigma result in after pollination? List two steps in sequence that follow after the process.
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Answer

When the pollen grains fall on the stigma, the pollen tube enters one of the synergids and releases two male gametes.
  1. One of the male gametes moves towards the egg cell and fuses with it to complete syngamy to form the zygote.
  2. The other male gamete fuses with the two polar nuclei and forms triploid Primary Endosperm Nucleus (PEN).
This is termed as triple fusion.
  1. Since, two kinds of fusion-syngamy and triple fusion take place, the process is known as double fertilization and is charactedstic of flowering plants.

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