Osmosis in Selectively Permeable Membrane

Q.

Osmosis is the movement of water molecules from its region of higher concentration to its region of lower concentration through a _______ membrane.

1. non-permeable

2. semipermeable

3. permeable

4. impermeable

Q.

State two true or false:

In an experiment on Osmosis if external pressure is applied on a dilute solution less water will pass into the concentrated solution.

Q.

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

(a) When placed in a more concentrated solution, the cell contents will ............................. (shrink/ swell up)

(b) The pressure by which the ............................. molecules tend to cross the semi-permeable membrane is called osmotic pressure.(salt / water)

(c) Active transport is in a direction ............................. to that of diffusion. (opposite / same)

Q.

Movement of water molecules along their concentration gradient through a selectively permeable membrane is known as _______.

1. Plasmolysis

2. Osmosis

3. Hydrolysis

4. Diffusion

Q.

Raisins are soaked in water for determining the percentage of water absorbed. The formula for calculating the percentage of water absorbed, is

1. $\frac{Finalweight-Initialweight}{Initialweight}\times 100$

2. $\frac{Finalweight-Initialweight}{Finalweight}\times 100$

3. $\frac{Initialweight-Finalweight}{Initialweight}\times 100$

4. $\frac{Initialweight-Finalweight}{Finalweight}\times 100$

Q.

Osmosis is the process by which water moves ___ across a semi-permeable membrane.

1. from higher to lower solute concentration

2. from lower to higher solute concentration

3. from higher to lower water concentration

4. from lower to higher water concentration

Q.

The diffusion of water from an external solution into dry raisins is called

1. exosmosis

2. endosmosis

3. imbibition

4. plasmolysis

Q. Why osmosis does not occur in air?

Q.

Osmosis involves the diffusion of

1. Suspended particles from lower to higher concentration

2. Suspended particles from higher to lower concentration

3. Water from more concentrated solution to less concentrated solution

4. Water from the less concentrated solution to the more concentrated solution

Q.

Osmosis and diffusion are the same except that in osmosis there is

(a) a freely permeable membrane

(b) a cell wall in between

(c) a selectively permeable membrane in between

(d) an endless inflow of water into a cell

Q.

DIRECTIONS: Read the following statements carefully and choose the correct options.
Read the following statements Mark ‘O’ for Osmosis and ‘D’ for Diffusion & choose the correct option below:
A. Gases in roots are taken up and thrown by
B. Water is taken by plasma membrane
C. Water is expelled out of plasma membrane
D. Exchange of gases

1. OODD

2. ODOD

3. DDOO

4. DOOD

Q. Aquaporins are ___ which enable the movement of water across the cell membrane.

1. fats
2. proteins
3. minerals
4. vitamins

Q.

Assertion (A): Transpiration is a necessary evil for plants.​

Reason (R): Sometimes transpiration leads to excessive loss of water causing the wilting of leaves.​

Q. Define the following
(i) Osmosis
(ii) Diffusion
(iii) Turgor pressure
(iv) Hypertonic solution
(v) Plasmolysis

Q.

When does the osmotic flow of water occur through a semipermeable membrane?

Q.

Give reason why the phenomenon of osmosis cannot be demonstrated by using a boiled potato.

Q. Which of the following is true about Osmosis?

1. Transport of solute from higher concentration to lower concentration.
2. It requires energy
3. It needs a semipermeable membrane and is a movement process primarily for water
4. All of the above

Q. Name the following:
(i) The pressure with which the molecules of a substance diffuse.
(ii) Two solutions having same concentrations.
(iii) The force developing in shoot responsible for most of the absorption of water.
(iv) The uptake of mineral ions against concentration gradient.
(v) Tissue concerned with upward conduction of water.
(vi) Condition of cell in which the cell contents are shrunken.
(vii) The inward movement of solvent molecules through the plasma membrane of cell.
(viii) The process by which raisins swell up when placed in a beaker of water.
(ix) Movement of molecules from a region of high concentration to a region of low concentration.

Q. Which of the following is true about Osmosis?

1. It requires energy
2. Transport of solute from higher concentration to lower concentration.
3. All of the above
4. It needs a semipermeable membrane and is a movement process primarily for water

Q. Who gave protoplasmic streaming hypothesis for translocation?

1. De Vries
2. Blackman
3. Williams
4. Hart

Q. Explain the terms given below:
(i) Diffusion
(ii) Osmosis
(iii) Exosmosis
(iv) Hypertonic Solution
(v) Root Pressure

Q. Aquaporins are ___ which enable the movement of water across the cell membrane.

1. minerals
2. fats
3. proteins
4. vitamins

Q. Define the following
(i) Osmosis
(ii) Diffusion
(iii) Turgor pressure
(iv) Hypertonic solution
(v) Plasmolysis

Q. Transpiration is defined as:

1. The loss of water as water vapour from the aerial parts of a plant.
2. The elimination of water with dissolved minerals.
3. Release of water by plant into atmosphere
4. The rise of water upwards along the stem of a plant.