Question. 1) The seed of___ Can remain dormant up to 30 years span.
1. Argemone
2. Acacia
3. Amaranthus
4. Anona
Answers
Answer:
2 is your answer
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’.
Answer:
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’.