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प्रश्न
Give reasons for the following:
If you sprinkle some common salt on grass growing on a lawn, it is killed at that spot.
उत्तर
Common salt, when sprinkled on the grass, causes the plasmolysis of grass cells, ultimately leading to their death. Hence, if we sprinkle some common salt on grass growing on a lawn, it is killed on the spot.
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संबंधित प्रश्न
Explain Turgor pressure
Give the equivalent term for the following:
The condition in which the cell contents are shrunken.
What is the difference between ‘flaccid’ and ‘turgid’? Give one example of flaccid condition in plants.
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.
Differentiate between the following:
Plasmolysis and Deplasmolysis.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Flaccidity is the reverse of turgidity.
Fill in the Blank
The condition opposite to turgid is ___________.
Fill in the Blank
Wilting and drooping of leaves is due to loss of ________.
Excessive use of fertilisers in agricultural fields reduces the yield of crops. Justify the statement.
The figure given below is a diagrammatic representation of a part of the cross-section of the root in the root hair zone. Study the same and then answer the questions that follow:
- The parts labelled as 1, 2, 3 and 4 are:
- Root hair, Xylem vessel, Soil particles, Cortex respectively.
- Xylem vessel, Soil particles, Root hair, Cortex respectively.
- Root hair, Xylem vessel, Cortex, Soil particles respectively.
- Cortex, Soil particles, Xylem vessel, Root hair respectively.
- The process that enables the passage of water from soil into the root hair is:
- Diffusion
- Active transport
- Osmosis
- Passive absorption
- The kind of force which exists between a liquid and any surface is called as:
- Cohesive force
- Adhesive force
- Capillarity
- Suction force
- The kind of force between the same kind of liquid molecules is:
- Capillary force
- Transpirational pull
- Adhesive force
- Cohesive force
- Sometimes exudation of water occurs from the margin of the leaves in the early morning or night. It is termed as:
- Transpiration
- Guttation
- Bleeding
- Osmosis
