Question
State two factors within the seed and two outside the seed that cause dormancy.
(i) Within the seed
(ii) Outside the seed
(i) Within the seed
(ii) Outside the seed
Answer
(i)
- Presence of abscisic acid(ABA)
- Presence of germination inhibitors
- Embryo not fully developed/immature embryo
- Absence of hormones/enzymes that stimulate germination
Acc inactivity of hormones/enzymes inhibitors
- Impermeable seed coat
(ii) - Unsuitable temperatures/lack of suitable/unfavorable temperatures
- Absence of light
- Lack of Oxygen
- Lack of water
- Presence of germination inhibitors
- Embryo not fully developed/immature embryo
- Absence of hormones/enzymes that stimulate germination
Acc inactivity of hormones/enzymes inhibitors
- Impermeable seed coat
Acc for germination hormones such as cytokines, gibberellins
(ii) - Unsuitable temperatures/lack of suitable/unfavorable temperatures
- Absence of light
- Lack of Oxygen
- Lack of water
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