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Question : Give various causes for seed dormancy.

Answer»

Solution :Various Causes for Seed Dormancy :
UNDERDEVELOPED embryo.
Seed coats IMPERMEABLE to water.
MECHANICALLY hard and strong seed coats which do not permit germination.
Physiologically immature embryo.
Presence of some germination-inhibiting chemicals. Amongst them the main one is Abscisic acid.
Amongst hormones, Gibberrelins are absent in dormant seeds.
At this time, ABA remains ACTIVE. It INHIBITS the transcription of genes. As a result, proper enzymes are not synthesized.
Removal of Seed Dormancy


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