Explanation:
Seed dormancy is a condition where a seed fails to germinate even when external conditions (water, oxygen, temperature) are favorable. This can happen due to multiple reasons, including:
Mechanical resistance of the seed coat → (A)
- Some seeds have hard seed coats that physically prevent the embryo from growing out.
Impermeability of the seed coat to oxygen → (B)
- Certain seeds do not allow oxygen to penetrate, which is crucial for cellular respiration and germination.
Impermeability of the seed coat to water → (C)
- Seeds with a thick or waxy seed coat may not absorb water, delaying the activation of enzymes required for growth.
Since all these factors contribute to delayed seed germination, the correct answer is (D) all of the above.
Explanation by: Mr. Dubey
Seed dormancy is a condition where a seed fails to germinate even when external conditions (water, oxygen, temperature) are favorable. This can happen due to multiple reasons, including:
Mechanical resistance of the seed coat → (A)
- Some seeds have hard seed coats that physically prevent the embryo from growing out.
Impermeability of the seed coat to oxygen → (B)
- Certain seeds do not allow oxygen to penetrate, which is crucial for cellular respiration and germination.
Impermeability of the seed coat to water → (C)
- Seeds with a thick or waxy seed coat may not absorb water, delaying the activation of enzymes required for growth.
Since all these factors contribute to delayed seed germination, the correct answer is (D) all of the above.