The experimental set-up that is used MAINLY to demonstrate positive geotropism in plants is
Correct answer: B. B
- A. A
- B. B
- C. C
- D. D
Explanation
Only option B shows positive geotropism as pea seedling growing in a porous pot and sand, with roots growing downwards demonstrates Positive Geotropism. The image clearly shows the roots of the pea seedling growing vertically downwards, following the pull of gravity, which is the definition of positive geotropism. The setup ensures the plant is growing in a condition where the root's response to gravity can be easily observed.
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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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