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Hypothetical plant hormones are
Options
(a) florigen
(b) vernalin
(c) florigen and vernalin
(d) auxin
Correct Answer:
florigen and vernalin
Explanation:
The commonly recognized classes of plant hormones are the auxins, gibberelins, cytokinins, abscisic acid, and ethylene, Circumstantial evidence suggest that flower initiation is controlled by hypothetical hormones called florigens, but these substances remain to be identified. Florigen means flower forming hormones. A German plant physiologist Georg Melchers had proposed the existence of a stimulus of vernalization and he termed it as vernalin. Vernalin has not been isolated so far so it still remains to be
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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
- In man the thoracic basket is composed of
- Megaspores are produced from the megaspore mother cells after
- One of the oldest, best preserved and most complete hominid fossil commonly
- In a mammalian cell the longest and the most active phase of the cell cycle
- During mitosis ER and nucleolus begin to disappear at:
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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