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प्रश्न
Salt is applied to tennis lawns to kill weeds. How does salting tennis lawns help in killing of weeds without affecting the grass?
उत्तर
Applying salt may not only lead to the death of weeds but also the grass. Applying salt to plants leads to osmosis and water comes out of the cell. It is a misconception that applying salt may lead to the death of only weed plants.
Plant cells losing excess water may lead to the death and later death of the plant. Some gardeners practised applying salt but it had drawbacks. The only solution to protect useful plants is to sprinkle weeds only, but it is not a full-proof method to avoid weeds without affecting useful plants.
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संबंधित प्रश्न
Differentiate between guttation and transpiration.
What role does root pressure play in water movement in plants?
Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to 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?
The process of guttation takes place ______.
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?
