Water will be absorbed by the root hairs when:
- ✓Concentration of solutes in the cell sap is high
- BConcentration of solutes in the soil is high
- CThe plant is rapidly respiring
- DNone of the above
Answer: A.
View full solution →Question types
Absorption by Roots question types
116 questions across 7 question groups — pick any mix to generate a Biology paper with step-by-step answer keys.
116
Questions
7
Question groups
5
Question types
01
MCQ
11 Q→02Fill in the blanks.
10 Q→03[1 Mark Question Answer]
49 Q→04[2 Mark Question Answer]
20 Q→05[3 marks Question Answer]
17 Q→06[5 Mark Question Answer]
2 Q→07TRUE / FALSE
7 Q→Sample Questions
Absorption by Roots questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Osmosis involves diffusion of $.......$
- Asuspended particles from lower concentration to higher concentration.
- Bsuspended particles from higher concentration to lower concentration.
- ✓Molecules or ions from the more concentrated solution to the less concentrated solution.
- Dwater from the less concentrated solution to the more concentrated solution.
Answer: C.
View full solution →Marine fish when thrown under tap water bursts because of:
- ✓Endosmosis
- BDiffusion
- CExosmosis
- DPlasmolysis
Answer: A.
View full solution →Process of endosmosis stops:
- AWhen equal
- ✓When solution becomes isotonic
- CWhen the leaves fall.
- DWhen there is no light
Answer: B.
View full solution →Seeds when soaked in water imbibe in it because:
- AOsmotic pressure inside the seed is low
- BSeed coat contains lot of salts
- ✓The process of absorption works
- DThere are many vacuoles in the endosperm
Answer: C.
View full solution →Diffusion is the movement of molecules from a region of their ________ concentration to the region of their ________ concentration.
The condition opposite to turgid is ___________.
Water and mineral salts absorbed by root is known as ______.
Raisin swells up when kept in a __________ solution.
A plasmolysed cell has __________ protoplast.
A thin strip of epidermal cells of a leaf was observed in a drop of water. They all looked turgid and normal.
(a) Draw a diagram of such a cell.
(b) Draw a diagram of a cell if this strip is transferred to a strong concentrated solution of sugar. What is term used for the effect on the cells ?
(a) Draw a diagram of such a cell.
(b) Draw a diagram of a cell if this strip is transferred to a strong concentrated solution of sugar. What is term used for the effect on the cells ?
Draw a diagram of the root hair cell as it would appear when a concentrated solution of fertilizers is added near it.
What is the water potential?
Grapes shrink when immersed in a very strong sugar solution.” Explain.
What is toxicity ?
Draw a cross-section of root showing association of soil particles with root hairs.
What is the significance of diffusion?
Define the Cohesive and Adhesive forces.
What do you mean by transpiration pull ?
Root hairs become flaccid, when fertilizers are added to the moist soil around it. Explain.
Give a diagrammatic representation of plasmolysis in a cell.
Give at least three uses of water to green plants
How is root hair structurally adapted for absorption of water from the soil?
The apparatus arranged here signifies an important process.
(i) Name the process.
(ii) Where does this process occur in plants?
(iii) What solution is placed inside the dialysis tubing?
(iv) What happens to the level of the solution in the capillary tube?
(v) Define the process mentioned in Q. (i) above.
(i) Name the process.
(ii) Where does this process occur in plants?
(iii) What solution is placed inside the dialysis tubing?
(iv) What happens to the level of the solution in the capillary tube?
(v) Define the process mentioned in Q. (i) above.
A plant cell kept in a drop of water was examined under the low power magnification of a microscope, as shown:
(i) What would you do to bring this cell back to its original condition?
(ii) What scientific term is used for such condition?
(iii) Draw the same cell if it is kept in a strong sugar solution.
(i) What would you do to bring this cell back to its original condition?
(ii) What scientific term is used for such condition?
(iii) Draw the same cell if it is kept in a strong sugar solution.
A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decreased in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment:
(i) Give the technical terms of the solutions used in beakers, 1, 2 and 3.
(ii) In beaker 3, the size of the potato cube remains the same. Explain the reason in brief.
(iii) Write the specific feature of the cell sap of root hairs which helps in absorption of water.
(iv) What is osmosis?
(v) How does a cell wall and a cell membrane differ in their permeability?
(i) Give the technical terms of the solutions used in beakers, 1, 2 and 3.
(ii) In beaker 3, the size of the potato cube remains the same. Explain the reason in brief.
(iii) Write the specific feature of the cell sap of root hairs which helps in absorption of water.
(iv) What is osmosis?
(v) How does a cell wall and a cell membrane differ in their permeability?
The diagram below represents an experimental set up to demonstrate a vital process. Study the same and then answer the questions that follow:
(i) Name the process.
(ii) Define the above named process.
(iii) What would you observe in the experimental setup after an hour or so?
(iv) What control experiment can be set up for the above experiment?
(v) Keeping in mind the root hair cell and its surrounding name the part that corresponds to (1) Concentrated sugar solution, (2) Parchment paper, (3) Water in the beaker.
(vi) Name any other substance that can be used instead of parchment paper in the above experiment.
(vii) Mention two advantages of this process to the plant.
(i) Name the process.
(ii) Define the above named process.
(iii) What would you observe in the experimental setup after an hour or so?
(iv) What control experiment can be set up for the above experiment?
(v) Keeping in mind the root hair cell and its surrounding name the part that corresponds to (1) Concentrated sugar solution, (2) Parchment paper, (3) Water in the beaker.
(vi) Name any other substance that can be used instead of parchment paper in the above experiment.
(vii) Mention two advantages of this process to the plant.
Flaccidity is the reverse of turgidity.
Cells that have lost their water content are said to be deplasmolysed.
Plasmolysis makes the cell turgid.
During exosmosis, water moves from inside the cell to the outside of the cell.
The plasma membrane permits the passage of all solutes and water.
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