Seed dormancy can be broken by

ABA and

{G A}_{3}

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{G A}_{3}

and ethylene

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IAA and ABA

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ABA and IPA

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Solution

The correct option is A ${G A}_{3}$ and ethylene
During unfavourable environmental condition, dormancy of seed takes place with the help of abscisic acid hormone. When favourable condition returns, seed dormancy is broken. However, seed dormancy can be broken by application of various growth regulators like gibberellin, cytokinin and ethylene.
Thus, the correct answer is option B.

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