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प्रश्न
Excessive use of fertilisers in agricultural fields reduces the yield of crops. Justify the statement.
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उत्तर
The excessive use of fertilizers in agriculture increases the concentration of solvents outside of the root cells, which causes exosmosis. The state of the crops becomes plasmolysis/Flaccid, which results in a diminishing yield.
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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.
A plant cell may burst when :
Give scientific reasons : Balsam plants wilt during mid-day even if the soil is well watered.
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’.
Give the equivalent terms for the following:
Loss of water through a cut stem.
Give reasons for the following:
If you sprinkle some common salt on grass growing on a lawn, it is killed at that spot.
Give reason for the following:
It is better to transplant seedlings in a flower-bed in the evening and not in the morning.
Mention whether the following statement is true (T) or false (F) and give an explanation in support of your answer.
Soaked seeds burst into three seed coats.
Name the following:
The process by which wilting or drooping of leaves occurs.
The hydrostatic pressure of the cell sap on the cell wall is called ______.
