Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone :
Correct answer: A. Auxin
- A. Auxin
- B. Cytokinin
- C. Ethylene
- D. Abscisic Acid
Explanation
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 Indoleacetic acid in plants. It is an activator in the enzyme tryptophan synthetase. Tryptophan is the precursor of Indoleacetic acid.
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About Growth and Development
Embryonic development covers fertilization, cleavage, formation of the blastula and gastrula, germ layers, organ formation and differentiation. Regeneration describes the replacement of lost tissues or body parts, whereas ageing involves gradual cellular and physiological changes linked to reduced repair, altered metabolism and declining organ function.
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