NEET Biology question
The following statements are given about plant growth hormones: I. Kinetin is a degradative substance from DNA molecule. II. ABA is present in all the plants. III. Low ratio of cytokinins to auxins favours root formation only. IV. ABA is synthesized catabolically through mevalonate pathway. The correct combination is
Answer: (C)
Solution
Statement I is true: kinetin was discovered as a degradation product of autoclaved herring-sperm DNA (a modified adenine derivative), not as a naturally occurring plant cytokinin. Statement III is true: in tissue culture, a low cytokinin : auxin ratio favours root formation (a high ratio favours shoot formation).
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