Advertisements
Advertisements
प्रश्न
Plants show temporary and permanent wilting. Differentiate between the two. Do any of them indicate the water status of the soil?
Advertisements
उत्तर
| Temporary Wilting | Permanent Wilting |
| (i) There is a temporary loss of turgidity in cells. | (i) There is permanent loss of turgidity in cells. |
| (ii) This happens when the rate of | (ii) This happens when the rate of transpiration is more than the rate of water supply Then the rate of water supply. But the difference is below a critical level. |
| (iii) Wilting disappears as soon as the water supply resumes to normal. | (iii) Wilting does not disappear even after the water supply resumes to normal. |
| (iv) Plant recovers its normal activity. | (iv) Plant eventually dies. |
APPEARS IN
संबंधित प्रश्न
An apparatus, as shown below, was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
- Name the process being studied.
- Explain the process named above in Q.3(a)(i).
- Why was the pot covered with a plastic sheet?
- Suggest a suitable control for this experiment.
- Mention two ways in which this process is beneficial to plants.
- List three adaptations in plants to reduce the above mentioned process.
The loss of water in the form of water vapour through stomata on leaves is known as ___________.
Name the process by which water loss takes place through the leaves.
How does transpiration help in the uptake of water from the soil?
(a) State whether the following statement are True or False.
(b) Rewrite the false statement in the correct form by changing either the first or the last word only.
Most transpiration occurs at midnight.
Give suitable explanation for the following:
Cork and bark of trees help in preventing loss of water
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in front of a fan?
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in sunlight.
Choose the correct answer:
More water loss in plants is the cause of wilting. This can be checked by ____________
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
Name the process being studied.
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
Mention two ways in which this process is beneficial to plants.
What causes the opening and closing of guard cells of stomata during transpiration?
Why is transpiration called a necessary evil?
Which one is not related to transpiration?
How can plants be grown under limited water supply without compromising on metabolic activities?
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
Keep some freshly cut flowers in a solution of food colour. Wait for sometime for the dye to rise in the flower, when the stem of the flower is held up in light, coloured strands can be seen inside. Can this experiment demonstrate which tissue is conducting water up the stem?
ABA (Abscisic acid) is called a stress hormone. From where does this hormone get released in leaves?
Observe the diagram and answer the following;
 (i) |
 (ii) |
- Are these types of guard cells found in monocots or dicots?
- Which of these shows a higher water content (i) or (ii)?
- Which element plays an important role in the opening and closing of stomata?
