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NTA Abhyas NEET2020BotanyPlant - Growth and DevelopmentPractice

The following statements are given about different plant growth hormones: I. Cytokinin suppresses the synthesis of chlorophyll. II. Auxins control apical dominance. III. Gibberellins promote shoot elongation. IV. Abscisic acid enables seeds to withstand desiccation. Which of the above statements are correct?

Options

  1. AI and II
  2. BII and III
  3. CI and III
  4. DII, III and IV

Correct answer

D. II, III and IV

Step-by-step solution

'Cytokinin' delays the senescence of leaves and prevents chlorophyll degradation. It can be shown by a rapid bioassay technique. Cytokinin treated leaf tips retard the process of chlorophyll degradation as compared to untreated leaf discs.

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