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Regarding dormancy of seeds, the phytohormones that show antagonistic effect are

PLANT GROWTH REGULATORS
NEET
1

Cytokinin and gibberellin

2

Auxin and cytokinin

3

Gibberellin and abscisic acid

4

Ethylene and gibberellin

Solution:

Gibberellins (GA) are plant growth regulators that promote seed germination and break dormancy. Abscisic acid (ABA), on the other hand, acts as a growth inhibitor and promotes seed dormancy. Therefore, gibberellin and abscisic acid show an antagonistic effect regarding seed dormancy.