Gibberellin was isolated from:
Correct answer: B. A fungus
- A. An algae
- B. A fungus
- C. A bacterium
- D. A virus
Explanation
The correct answer is that gibberellins were first isolated from a fungus, specifically Gibberella fujikuroi. This fungus is known for causing the 'foolish seedling' disease in rice, which results in excessive elongation of the plant. Algae, bacteria, and viruses do not produce gibberellins and are therefore incorrect choices for this question.
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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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