Osmosis

Q.

The plants absorb water from the soil with the help of root hair through osmosis.

1. True

2. False

Q.

The process by which roots absorb water from soil is known as ___.

Q.

What is turgid

Q.

1. Cell gains water by osmosis.

2. Cell membrane dissolves in water

3. Cell membrane becomes weak

4. The force of outside water is more than the force of cytoplasm.

Q.

Differentiate between asexual and sexual reproduction. [5 MARKS]

Q.

Which of the following is an example of osmosis?

1. uptake of water by root hair

2. exchange of gases in stomata

3. opening of stomata

4. swelling of seed when put in soil

Q.

Fresh grapes shrink when placed in:

1. Concentrated salt solution

2. Hot water

3. Cold water

4. Starch water

Q.

Transpiration does not help the plant to maintain optimum osmotic balance.

1. True

2. False

Q.

Which of the following is not a use of water in a plant?

1. I & III

2. III, IV & V

3. III & II

4. II only

Q. Explain why water gathers in the hollowed portion of B and C.

1. There is the difference in the concentration of water in the through and water in the cup (Potato).
2. Exosmosis takes place as the potato cells act as a semipermeable membrane.
3. Both A and B.
4. None of these

Q.

Water from the soil enters the root xylem by the process

1. Diffusion

2. Active transport

3. Osmosis

4. Diffusion and Active transport

Q.

Which of the following processes involve osmosis?

1. I & III

2. III, IV & V

3. III & II

4. II only

Q. Why is potato A necessary for this experiment?

1. It acts as a control.
2. It acts as a accessory.
3. Both A and B
4. None of these

Q.

Which of the following processes takes place in plants?

1. Conduction

2. Transpiration

3. Osmosis

4. All of the above

Q. Transpiration mainly occurs through ________ .

1. flowers
2. roots
3. shoots
4. leaves

Q.

What is plasmolysis?

1. Multiplication of cell

2. Expansion of cell protoplast

3. Cell death

4. Contraction of cell protoplast

Q. Define plasmolysis.

Q. If a cell shrinks when placed in a solution, this solution is

1. Hypotonic
2. Hypertonic
3. Isotonic
4. Pure solvent

Q.

What will happen to the grapes if they are kept in honey?

1. They will burst.

2. They will remain the same.

3. They will swell up.

4. They will shrink.

Q. Incipient plasmolysis occurs, when the osmotic concentration of a solution in which the tissue is suspended is

1. Hypertonic
2. Hypotonic
3. Near isotonic
4. Near hypotonic

Q.

Name the following:
The process by which root hairs absorb water from the soil.

Q.

A plant cell shrivels when put these in __________

1. Isotonic solution

2. Hypertonic solution

3. Hypotonic solution

4. None of the choices

Q.

Why do plants need water?

Q. Movement of water from an area of higher concentration to lower concentration through a semi-permeable membrane is called ____.

1. active transport
2. osmosis
3. diffusion
4. filtration

Q.

Fill in the blanks by choosing the correct alternative from those given in the brackets.

e. Absorption of water in plants takes place through the roots by the process of _________. (osmosis/diffusion)

Q.

________________ involves expenditure of energy

1. Diffusion

2. Osmosis

3. Active transport

4. Imbibition

Q. When a plant cell is placed in a hypotonic solution, which of the following will not apply?

1. Wall pressure is decreased
2. The cell become turgid
3. Water potential of the cell sap will increase
4. Suction pressure of the cell sap will decrease

Q. In hypertonic solution, water potential of a cell

1. Increases
2. Decreases
3. First increases then decreases
4. No change

Q. differentiate between transpirational pull and capillary action

Q. When a plant cell is placed in a hypertonic solution it becomes plasmolysed. What shall be present between cell wall and plasmalemma at this stage?

1. Water and air
2. Cell sap
3. Hypertonic solution
4. Solutes