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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.
Related Questions: - The phenomenon ‘ontogeny repeats phylogeny’ is explained by
- The largest quantity of air that can be expired, after maximal inspiration effort
- The terga, sterna and pleura of cockroach body are joined by :
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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
- The phenomenon ‘ontogeny repeats phylogeny’ is explained by
- The largest quantity of air that can be expired, after maximal inspiration effort
- The terga, sterna and pleura of cockroach body are joined by :
- The organelle of plant cell that does not contain functional DNA is
- Cristae are associated with which of the following
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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