MCQ

MCQ 11 Mark

Water will be absorbed by the root hairs when:

✓
Concentration of solutes in the cell sap is high
B
Concentration of solutes in the soil is high
C
The plant is rapidly respiring
D
None of the above

Answer

Correct option: A.

Concentration of solutes in the cell sap is high

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MCQ 21 Mark

Osmosis involves diffusion of $.......$

A
suspended particles from lower concentration to higher concentration.
B
suspended particles from higher concentration to lower concentration.
✓
Molecules or ions from the more concentrated solution to the less concentrated solution.
D
water from the less concentrated solution to the more concentrated solution.

Answer

Correct option: C.

Molecules or ions from the more concentrated solution to the less concentrated solution.

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MCQ 31 Mark

Marine fish when thrown under tap water bursts because of:

✓
Endosmosis
B
Diffusion
C
Exosmosis
D
Plasmolysis

Answer

Correct option: A.

Endosmosis

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MCQ 41 Mark

Process of endosmosis stops:

A
When equal
✓
When solution becomes isotonic
C
When the leaves fall.
D
When there is no light

Answer

Correct option: B.

When solution becomes isotonic

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MCQ 51 Mark

Seeds when soaked in water imbibe in it because:

A
Osmotic pressure inside the seed is low
B
Seed coat contains lot of salts
✓
The process of absorption works
D
There are many vacuoles in the endosperm

Answer

Correct option: C.

The process of absorption works

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MCQ 61 Mark

The space between the cell wall and plasma membrane in a plasmolysed cell is filled with ______.

A
isotonic solution
B
hypotonic solution
✓
hypertonic solution
D
water

Answer

Correct option: C.

hypertonic solution

The space between the cell wall and plasma membrane in a plasmolysed cell is filled with hypertonic solution.
Explanation:
When a cell is put in a hypertonic solution (where the concentration of solutes is higher outside than that inside the cell); the water molecules move more outside the cell than inside, this results in cell shrinkage which is called plasmolysis i.e., shrinkage of protoplasm.

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MCQ 71 Mark

Plasma membrane controls:

A
Passage of water only
✓
Passage of water and solutes in and out of the cell
C
Passage of water and solutes into the cell
D
Movement of cell contents out of the cell

Answer

Correct option: B.

Passage of water and solutes in and out of the cell

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MCQ 81 Mark

Osmosis involves:

A
Cell to cell movement of water
B
Movement of water through cortical cells
C
Adiva absorption of water through roots
✓
All of the above

Answer

Correct option: D.

All of the above

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MCQ 91 Mark

When cell is fully turgid, which of the following will be zero?

A
Osmotic pressure
B
Turgor pressure
C
Wall pressure
✓
Suction pressure $(SP)$ or diffusion pressure deficit $\ce{(DPD)}$

Answer

Correct option: D.

Suction pressure $(SP)$ or diffusion pressure deficit $\ce{(DPD)}$

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MCQ 101 Mark

When a plant wilts, the sequence of events will be as follows:

A
Exosmosis, plasmolysis, deplasmolysis, temporary wilting
B
Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting
✓
Exosmosis, plasmolysis, temporary and permanent wilting
D
None of the above

Answer

Correct option: C.

Exosmosis, plasmolysis, temporary and permanent wilting

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MCQ 111 Mark

In the process of osmosis in a cell:

A
Both protoplasm and cell wall act as a membrane
B
Only cell wall acts as a membrane
C
Only outermost layer of protoplast acts as a membrane
✓
The entire protoplast acts as a membrane

Answer

Correct option: D.

The entire protoplast acts as a membrane

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Biology MCQ

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