Select the correct reason for seed dormancy.

Immature embryo

Hard seed coat

Presence of germinating inhibitors

All of the above

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Dormancy is the condition of a seed when it fails to germinate even when environmental conditions considered necessary for germination are available. The following are some main causes of seed dormancy:

1) Immature embryo: some seeds fail to germinate due to the partial development of the embryo at the time of their dissemination.

2) Hard seed coat: the presence of hard seed coat causes dormancy as it is impermeable to water and gases and mechanically restrict the growth of the embryo.

3) The presence of germinating inhibitors: Some plants produce certain chemical compounds which inhibit seed germination.

Thus option D is the correct answer.

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