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Question

Seed dormancy can be broken by the following combination of chemicals

A
GA3, IAA and ABA
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B
KNO3,GA3 and Ethylene chlorohydrin
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C
NAA, 2, 4, 5-T and IAA
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D
ABA, BAP and GA3
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Solution

The correct option is A KNO3,GA3 and Ethylene chlorohydrin
Dormancy in plants is seen due to certain germination inhibitors. By applying some growth regulators like Gibberellins, Cytokinins and Ethylene, it is possible to break the dormancy. They break seed dormancy by promoting mobilization of reserve food material. KNO3 is also used to break the seed dormancy in 0.02 M concentration. Thus, GA3, ethylene chlorohydrin and KNO3 are involved in seed germination in certain plants.
Thus, the correct answer is option B.

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