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Water reaches the top of a plant due to
Options
(a) root pressure
(b) capillarity
(c) transpiration
(d) diffusion
Correct Answer:
transpiration
Explanation:
Water is mainly absorbed by roots which goes upwards so as to replace water loss in transpiration and to be used in photosynthesis. This upward movement of water from roots to leaves through stem against force of gravity is called ascent of sap. Different theories have been put forward in support of ascent of sap. They include root pressure theory, capillary theory and transpiration pull theory . Root pressure is developed when rate of absorption is more than rate of transpiration and so water is pushed
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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
- The total gain of ATP from the break down of one molecule of glucose
- Dominant flora, 2.5 billion years ago was
- Animal requiring minimum amount of water to produce urine are
- Purines possess nitrogen at
- The rupture of urinary bladder is prevented by
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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