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प्रश्न
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 :
(i) Name the parts indicated by guidelines ‘1’ to ‘5’
(ii) Is the root hair cell unicellular or multi-cellular?
(iii) Draw a labeled diagram of the root hair cell as it would appear if some fertilizer is added to the soil close to it.
(iv) Name the process responsible for the entry of water molecules from the soil into A1 and then A2.
(v) What pressure is responsible for the movement of water in the direction indicated by arrows?
(vi) How is this pressure set up?
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उत्तर
(i) 1. Vacuole (containing cell sap)
2. Soil particles
3. Xylem vessel
4. Cortex cells
5. Vacuole in cortical cells
(ii) Root hair cell is unicellular
(iii) See diagram alongside.
(iv) Osmosis
(v) Osmotic pressure
(vi) This pressure is set up due to the difference in osmotic gradient.
APPEARS IN
संबंधित प्रश्न
How does movement and absorption of water take place through the roots?
Differentiate between the following:
Guttation and bleeding
Choose the correct answer:
Swelling of wooden doors during rains is caused by ___________
Study the experimental setup in the figure and then answer the question that follow.
Explain the phenomenon mention in question 8.1 .
Root hairs become flaccid, when fertilizers are added to the moist soil around it. Explain.
A thin strip of epidermal cells from the fleshy scales of an onion bulb was examined in a drop of water, under a microscope. All the epidermal cells looked alike and the figure alongside represents one of them. The thin strip was then transferred to a drop of strong sugar solution and re-examined under the microscope after about five minutes.
(i) Make a sketch of one of the epidermal cells, as it might appear after immersion in a strong sugar solution. Label any two parts which have undergone a change.
(ii) Give the scientific term for the change shown in Q.(i) above.
(iii) What would you do to bring this cell back to its original condition?
(iv) Give the scientific term used for the recovery of the cell as a result of the step taken in Q.(iii) above.
Multiple Choice Question:
The most widely accepted theory for ascent of sap is ______.
In the zone of absorption, epidermal cells form unicellular hair-like extensions called ________.
Outer layer of root hair is made up of ________.
Draw a neat and labelled diagram of the Root tip showing the root hair zone.
