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Plant Growth and Development question

2003 · Q1
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Plant Growth and Development question

2003 · Q1

NEETBiologyPlant Growth and DevelopmentMCQ+4 / −1
Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone
  1. A
    auxin
  2. B
    cytokinin
  3. C
    ethylene
  4. D
    abscisic acid.
View written solutionFree

Correct answer: A

Zinc is available to the plants for absorption in the divalent form. It occurs in the form of minerals as hornblende, magnetite, biotite, etc., from where it is released by weathering. It is involved in the synthesis of Indole-acetic acid in plants. It is an activator in the enzyme tryptophan synthetase. Tryptophan is the precursor of Indole-acetic acid.

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