Advertisements
Advertisements
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.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
A plant cell may burst when :
Fig. represents aprocess in plants. The set up was placed in bright sunlight. Answer the following questions:
-
- 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’.
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.
What is the difference between ‘flaccid’ and ‘turgid’? Give one example of flaccid condition in plants.
Distinguish between the following:
Flaccid condition and turgid condition
Differentiate between the following:
Plasmolysis and Deplasmolysis.
Name the following:
The condition in which the contents of a cell exert pressure against the cell wall making it distended.
Multiple Choice Question:
When cell is fully turgid, which of the following will be zero?
When the cells of a plant are fully distended, the condition is called ______.
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
