42. Wheat grains before germination absorb water by
(a) Endosmosis (b) Exosmosis
(c) Plasmolysis (d) Imbibition
Ans. (d) Breaking of the seed coat in germinating seeds is due to greater imbibitional swelling of the seed kernel (starch and protein) as compared to seed coverings. Seedling is able to come out of soil due to development of imbibition pressure.
(46)
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