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Which hormones promote the flowering in long day plants and also control sex expression in certain species?
Options
(a) ethylene
(b) gibberellin
(c) cytokinins
(d) auxin
Correct Answer:
gibberellin
Explanation:
Gibberelins are growth promoting phytohormones. Some of plant species flower only if the light period exceeds a critical length, and others flower only if this period is shorter than some critical length. Gibberelins can substitute for the long-day requirement in some species, showing an interaction with light. Gibberelins also promote the formation of male flowers on genetically female plants, e.g., Cannabis. They also replace female flowers with ,male flowers on monoecious plants of cucurbits.
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Topics: Plant Growth and Development
(126)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Energy enters ecosystem through
- Cell organelles common in Monera and Protista is
- Which is used in production of insulin by genetic engineering
- The similarity of bone structure in the forelimbs of many vertebrates is an
- A plant cell becomes turgid due to
Topics: Plant Growth and Development (126)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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