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प्रश्न
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.
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उत्तर
Due to excessive application of fertilizers in the agricultural fields it damage the roots by plasmolysis process which results into flaccidity of root hairs.
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संबंधित प्रश्न
Explain Turgor pressure
Fig. represents aprocess in plants. The set up was placed in bright sunlight. Answer the following questions:
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- Name the physiological process depicted in the figure.
- Why was oil added to the water?
- 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.
- What happens to the level of water when this setup is placed in:
- Humid conditions?
- Windy conditions?
- Mention any three adaptations found in plants to overcome the process mentioned in (a).
- Explain the term ‘Guttation’.
The state of a cell in which the cell wall is rigid and stretched by the increase in volume due to the absorption of water is called.
Give the equivalent term for the following:
The condition in which the cell contents are shrunken.
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 reason for the following:
It is better to transplant seedlings in a flower-bed in the evening and not in the morning.
A leaf cell of a water plant was placed in a liquid other than pond water. After sometime, it assumed a shape as shown below:
- Give the term for the state of the cell it has acquired.
- Name the structure which acts as a selectively permeable membrane.
- Comment on the nature (tonicity) of the liquid surrounding the cell.
- Name any one feature of this plant cell which is not present in an animal cell.
- Redraw in the space provided, the diagram of the cell if it is soon placed in ordinary water for some time.
Differentiate between the following
Turgor pressure and Root pressure
When the cells of a plant are fully distended, the condition is called ______.
Addition of salt to pickles is a method of killing the bacteria by ______.
