Seed dormancy may be due to
Seed dormancy may be due to
The correct option is D Hard impermeable seed coat
Reasons of seed dormancy:
1.
Immaturity
of embryo: Embryo is immature at the time of seed shedding. The seed
will remain dormant till the embryo becomes mature, e.g.,
Anemone nemorosa, Ranunculus ficaria.
2. After-Ripening: The seeds require a period of dry storage
for developing the ability to germinate, e.g., Wheat, Oat, Barley.
3.
Impermeable seed coat: The seed coat is impermeable to water and gases,
e.g., Apple, Chenopodium.
4.
Hard
seed coat: The seed coat is mechanically resistant and does not
allow the embryo to grow, e.g., Amaranthus,
Lepidium.
5. Germination Inhibitors: They occur in the seed coats and
cotyledons of the embryos. The important germination inhibitors causing seed
dormancy are abscisic acid, phenolic acid, ferulic acid, coumarin, short fatty
acids and cyanogenic chemicals, e.g., Apple, Peach, Ash, Cucurbita, Iris,
Xanthium.
So, the correct answer is ‘Hard impermeable seed coat’.
Reasons of seed dormancy:
1. Immaturity of embryo: Embryo is immature at the time of seed shedding. The seed will remain dormant till the embryo becomes mature, e.g., Anemone nemorosa, Ranunculus ficaria.
2. After-Ripening: The seeds require a period of dry storage for developing the ability to germinate, e.g., Wheat, Oat, Barley.
3. Impermeable seed coat: The seed coat is impermeable to water and gases, e.g., Apple, Chenopodium.
4. Hard seed coat: The seed coat is mechanically resistant and does not allow the embryo to grow, e.g., Amaranthus, Lepidium.
5. Germination Inhibitors: They occur in the seed coats and cotyledons of the embryos. The important germination inhibitors causing seed dormancy are abscisic acid, phenolic acid, ferulic acid, coumarin, short fatty acids and cyanogenic chemicals, e.g., Apple, Peach, Ash, Cucurbita, Iris, Xanthium.
So, the correct answer is ‘Hard impermeable seed coat’.
