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Who proposed cohesion theory of water movement in plants?
Options
(a) J C Bose
(b) Priestly
(c) Dixon and Jolly
(d) TV Engelmann
Correct Answer:
Dixon and Jolly
Explanation:
Cohesion-tension theory was proposed by Henry Dixon and Jolly in 1894. It is greatly supported and elaborated by Dixon (1914, 1924). It is also called transpiration pull theory and is based on the following assumptions.
1. Cohesive and adhesive properties of water molecules.
2. Continuous water column from root hairs through the stem to tip of leaves.
3. Strong transpiration pulls exerted by all the transpiring leaves on the stem.
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Topics: Transport and Nutrition in Plants
(163)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- During which phase(s) of cell cycle, amount of DNA in a cell remains at 4 C level
- Substrate for alcohol formation is
- A person is undergoing prolonged fasting. His urine will be found to contain
- Deforestation causes
- Which one of the following is vestigial organ in human beings
Topics: Transport and Nutrition in Plants (163)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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