Advertisements
Advertisements
प्रश्न
We know that plants are harmed by excess water. But plants survive under flooded condition. How are they able to manage excess water?
उत्तर
Some varieties of rice are adapted to survive in the flooded condition also. These types of plants can show quick growth in their stem during floods and ensure that some foliage parts are always above the water. They have hollow stems which help in gaseous exchange and hence we can see some rice plant varieties survive even 1 month in the flood.
APPEARS IN
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 ______.
Salt is applied to tennis lawns to kill weeds. How does salting tennis lawns help in killing of weeds without affecting the grass?
