Class 11 Biology Plant Physiology Plant Growth and Development



Legume seeds exhibit dormancy because of
(a)
Undeveloped embryo
(b)
Hard seed coat
(c)
Absence of cytokinin
(d)
Absence of Gibberellic acid 
Correct answer: (b) 
Solution: Physical dormacy is caused by a hard and impermeable seed coat or fruit enclosure which prevents imbibition and sometimes also gaseous exchange. The phenomenon is sometimes referred to as 'hard seed', because the seed coats remain hard and impermeable during exposure to normal germination conditions. Physical dormacy is mostly known and described from Leguminosae, a family where the majority of the species exhibit this type of dormacy.
Thus, the correct answer is option B.

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plant growth and development
transport in plants
respiration in plants
mineral nutrition
morphology of flowering plants