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प्रश्न
The process of guttation takes place ______.
विकल्प
When the root pressure is high and the rate of transpiration is low
When the root pressure is low and the rate of transpiration is high
When the root pressure equals the rate of transpiration
When the root pressure as well as rate of transpiration are high
उत्तर
The process of guttation takes place when the root pressure is high and the rate of transpiration is low.
Explanation:
The effect of root pressure is observable at night as well as the early morning when evaporation is low. Excess water gets collected in the form of droplets around special openings of veins near the tip of grass blades and leaves of many herbaceous parts of plants such as Tropaeolum, Balsam and grasses. Such water loss in its liquid phase is known as guttation.
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संबंधित प्रश्न
Differentiate between guttation and transpiration.
What role does root pressure play in water movement in plants?
The theory that suggests "water moves in a continuous column through stem and leaves" is known as
Root pressure is maximum, when :-
Match List - I with List - II.
| List - I | List - II | ||
| (a) | Cohesion | (i) | More attraction in the liquid phase |
| (b) | Adhesion | (ii) | Mutual attraction among water molecules |
| (c) | Surface tension | (iii) | Water loss in the liquid phase |
| (d) | Guttation | (iv) | Attraction toward polar surfaces |
Choose the correct answer from the options given below.
Which one of the following will not directly affect transpiration?
Water moves up against gravity and even for a tree of 20m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is ______.
From your knowledge of physiology can you think of some method of increasing the life of cut plants in a vase?
Salt is applied to tennis lawns to kill weeds. How does salting tennis lawns help in killing of weeds without affecting the grass?
We know that plants are harmed by excess water. But plants survive under flooded condition. How are they able to manage excess water?
