A) \[\text{IAA}\]
B) Gibberellin
C) Cytokinin
D) Ethylene
Correct Answer: B
Solution :
Gibberellins are growth hormones. These are produced by fungus, Gibberella fujikuroi. Gibberellin is responsible for the synthesits of enzymes in seed germination and stimules the synthesis of several enzymes including amylase, proteases, lipase etc. These enzymes catalyse the breakdown of food reserves in the seeds. \[\text{IAA}\] is the natural auxin which helps in cells growth and tropic movements. Cytokinins are plant growth hormones which helps in cell division. Ethylene is gaseous plant hormone which helps in fruit ripening.
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