Question

Seed dormancy is due to the

(a) ethylene

(b) abscisic acid

(c) IAA

(d) starch.

Answer 1

Option b is correct

Explanation :

Some common causes of seed dormancy are:

(i) Mechanically hard seed coat, which does not allow proper growth of embryo inside it, e.g., Brassica campestris.

(ii) Presence of impermeable (impervious) seed coat to H20, e.g. many seeds of legumes.

(iii) Presence of impermeable seed coat to oxygen; e,. g. Xanthium (cocklebur).

(iv) Presence of germination inhibitors like ABA (abscisic acid) and phenolics, etc., in seed coat or fruit pulp, e.g., in tomoto, inhibitor is present in fruit pulp.