Class 11 Biology Plant Physiology Plant Growth and Development



The major causes of seed dormancy are
(a)
Impermeable seed coats
(b)
Presence of some inhibitory substances
(c)
Presence of ABA
(d)
All of the above
Correct answer: (d) 
Solution: Under the unfavorable condition, seeds stop metabolic activity and undergo the inactive or resting stage is called as seed dormancy. Seed dormancy can be caused by various  factors such as temperature, light, water, permeability of the seed coat, hormones like ABA and external inhibitors. Dormancy prevents germination during unsuitable ecological conditions when the probability of seedling survival is low.
Thus, the correct answer is option D.

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plant growth and development
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