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प्रश्न
Give reason for the following:
It is better to transplant seedlings in a flower-bed in the evening and not in the morning.
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उत्तर
Transplantation causes stress on the seedlings. If the seedlings are transplanted in the morning, they would have to immediately bear the additional stress of excessive transpiration occurring during the hot afternoon. Transplantation in the evening helps the seedlings adjust for a longer time during the night (cooler temperatures) because the quantity of water absorbed exceeds the loss of water through transpiration. Therefore, it is better to transplant seedlings in a flower bed in the evening and not in the morning.
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संबंधित प्रश्न
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 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:
A plant cell, when kept in a hypertonic salt solution for about 30 minutes, turns flaccid.
The below diagram represents a plant cell after being placed in a strong sugar solution. Guidelines 1 to 5 indicate the following:
1. Cell wall
2. Plasma membrane.
3. Protoplasm
4. Large vacuole
5. Nucleus
Study the diagram and answer the questions that follow :
(i) What is the state of the cell shown in the diagram?
(ii) Name the structure which acts as a selectively permeable membrane.
(iii) If the cell had been placed in distilled water instead of a strong sugar solution which features: would not have been present?
(iv) If the cell in the diagram possessed chloroplasts where would these be present?
(v) Name any one feature of this plant cell which is not present in animal cells.
Give Technical Term for the following.
A cell in a fully extended condition.
Name the following:
The process by which wilting or drooping of leaves occurs.
Fill in the Blank
The condition opposite to turgid is ___________.
Fill in the Blank
Wilting and drooping of leaves is due to loss of ________.
When the cells of a plant are fully distended, the condition is called ______.
