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Plant Growth and Development — BIO BOTANY STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYPlant Growth and Development3 Marks
Question
Mention the factors causing dormancy of seeds.
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Answer

  • Hard, tough seed coat causes barrier effect as impermeability of water, gas and restriction of the expansion of embryo prevents seed germination.
  • Many species of seeds produce imperfectly developed embryos called rudimentary embryos which promotes dormancy.
  • Lack of specific light requirement leads to seed dormancy.
  • A range of temperatures either higher or lower cause dormancy.
  • The presence of inhibitors like phenolic compounds which inhibits seed germination cause dormancy.

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