The hormone(s) synthesised in the meristematic tissue of the plant shoot and root is/ areI. Abscisic acidII. AuxinIII. Cytokinin
Correct answer: D. II and III
- A. I only
- B. II only
- C. I and II
- D. II and III
Explanation
The correct answer is D. II and III. Both auxin and cytokinin are hormones synthesized in meristematic tissues of plants. Auxin is primarily responsible for cell elongation and is synthesized at the tips of shoots and roots. Cytokinin promotes cell division and differentiation and is also synthesized in these meristematic areas. Abscisic acid, on the other hand, is mainly involved in stress responses and is not typically synthesized in meristematic tissues, making options A, B, and C incorrect.
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About Plant Growth Regulators
Plant growth regulators are chemical messengers that control growth, development and responses to the environment. The topic covers auxins, gibberellins, cytokinins, abscisic acid and ethylene, including cell elongation, apical dominance, tropisms, seed germination, dormancy, fruit ripening and leaf fall, with growth promoters distinguished from inhibitors.
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