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प्रश्न
Give scientific reasons : Balsam plants wilt during mid-day even if the soil is well watered.
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उत्तर
In case of balsam plants, the rate of transpiration during mid-day exceeds the rate of absorption of water by the roots. The cells therefore lose turgidity. In the evening or during the night, the stomata are constricted and the temperature is not very high; therefore, there is no loss of water through transpiration, and the turgidity of the leaves is re-acquired.
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संबंधित प्रश्न
The diagram given below represents a plant cell after being placed in a strong sugar solution. Study the diagram and answer the questions that follow:
- What is the state of the cell shown in the diagram?
- Name the structure that acts as a selectively permeable membrane.
- Label the parts numbered 1 to 4 in the diagram.
- How can the above cell be brought back to its original condition? Mention the scientific term for the recovery of the cell.
- State any two features of the above plant cell which is not present in animal cells.
The diagram below represents a process in plants. The setup was placed in bright sunlight. Answer the following questions:
a) Name the physiological process depicted in the diagram.
Why was oil added to the water?
b) When placed in bright sunlight for four hours, what do you observe with regard to the initial and final weight of the plant? Give a suitable reason for your answer
c) What happens to the level of water when this setup is placed in:
- Humid conditions?
- Windy conditions?
d) Mention any three adaptations found in plants to overcome the process mentioned in (i).
e) Explain the term ‘Guttation’.
Differentiate between the following:
Turgidity and Flaccidity
Mention whether the following statement is true or false Correct the false statement by altering the last word only.
Cells that have lost their water content are said to be deplasmolysed.
Give suitable biological reasons for the following statement:
Root hairs become flaccid and droop when excess fertilizers are added to the moist soil around them.
Differentiate between:
Turgid and Flaccid.
Multiple Choice Question:
When cell is fully turgid, which of the following will be zero?
Deplasmolysis occurs when a plasmolysed cell is placed in ______.
The hydrostatic pressure of the cell sap on the cell wall is called ______.
When the cells of a plant are fully distended, the condition is called ______.
