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how do organisms reproduce ? — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencehow do organisms reproduce ?4 Marks
Question
Explain sexual reproduction in flowering plants.
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Answer

  • Sexual reproduction in flowering plants:
  • Pollen grains are produced in anther of a stamen while female gamete (egg cell) is produced in each ovule of an ovary.
  • Pollination:
  • A process of transfer of pollen from anther of stamen to the stigma of pistil is called pollination.
  • Fertilisation:
  • Pollens stick to stigma.
  • Pollen grain germinates to give rise to pollen tube which develops in style and reaches upto ovule.
  • The male germ cell produced by pollen grain fuses with female gamete (egg cell) present in the ovule.
  • This fusion of the germ cells is called fertilisation.
  • Zygote is formed due to the process of fertilisation.
  • Zygote is capable of growing into a new plant.
  • Post fertilisation events:
  • After fertilisation, zygote divides several times to form an embryo within the ovule.
  • The ovule develops a tough coat and is gradually converted into a seed.
  • The ovary grows rapidly and ripens to form a fruit.
  • The seed contains the future plant or embryo which develops into a seedling under favourable condition.
  • This process is called seed germination.

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