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  4. Read the following information about a phytohormone and then identify it. I. They cause fruits like apple to elongate and improve their shape. II. They are used to speed up the malting process in the brewing industry. III. They are used to convert genetically dwarf plants into tall plants.

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Q. Read the following information about a phytohormone and then identify it.
I. They cause fruits like apple to elongate and improve their shape.
II. They are used to speed up the malting process in the brewing industry.
III. They are used to convert genetically dwarf plants into tall plants.

NTA AbhyasNTA Abhyas 2022

Solution:

Gibberellins are growth promoter phytohormones. They are denoted as GA1, GA2 and GA3, and so on. Gibberellic acid (GA3) was one of the first gibberellins to be discovered and remains the most intensively studied form. Gibberellins cause fruits like apple to elongate and improve its shape. They also delay senescence. GA3 is used to speed up the malting process in the brewing industry. They also cause internode elongation, and hence, they can be used to convert a dwarf plant into a tall plant.