Cell Membrane, Diffusion & Osmosis Quiz for Class 9

The cell membrane controls what enters and leaves a cell. It helps the cell take in useful substances and remove waste. The cell wall gives extra support and protection to plant cells. This 30-question Class 9 Science quiz will help you revise these important concepts and check how well you understand the movement of substances across cells.

Cells also move substances from one place to another. Diffusion moves particles from a region of higher concentration to a region of lower concentration. Osmosis is the movement of water through a selectively permeable membrane.

Quiz Time

Cell Membrane, Diffusion, Osmosis & Cell Wall Quiz

Test your knowledge of cell membrane, diffusion, osmosis, and cell wall with 30 multiple-choice questions. Revise how substances and water move across cells and understand the role of the cell wall in plant cells.

Identify the key fact or definition described in the question.

1 / 30

1. What is the genetic-material region of a prokaryotic cell called?

a) Nucleolus

b) Chromoplast

c) Nucleoid

d) Nucleus

Identify the key fact or definition described in the question.

2 / 30

2. What is the movement of water through a selectively permeable membrane called?

a) Photosynthesis

b) Osmosis

c) Diffusion

d) Respiration

Identify the key fact or definition described in the question.

3 / 30

3. What are the functional segments of DNA called?

a) Ribosomes

b) Cristae

c) Genes

d) Vesicles

Identify the key fact or definition described in the question.

4 / 30

4. What model explains the structure of the cell membrane?

a) Fluid-mosaic model

b) Cell theory model

c) Lock-and-key model

d) Chromosome model

Identify the key fact or definition described in the question.

5 / 30

5. What is the main function of ribosomes?

a) Waste storage

b) Lipid storage

c) Protein synthesis

d) DNA storage

Identify the key fact or definition described in the question.

6 / 30

6. What is the net movement of particles from higher to lower concentration called?

a) Mitosis

b) Respiration

c) Diffusion

d) Osmosis

Identify the key fact or definition described in the question.

7 / 30

7. Why is the model called 'mosaic'?

a) It contains only one type of molecule

b) The membrane is made of glass

c) Different molecules are arranged like tiles in a mosaic

d) It has a square shape

Identify the key fact or definition described in the question.

8 / 30

8. What does a virus contain according to the chapter?

a) Cellulose and DNA

b) Only proteins

c) Genetic material with a protein coat

d) Only lipids

Identify the key fact or definition described in the question.

9 / 30

9. What does the cytoskeleton provide?

a) Only DNA synthesis

b) Structural support, cell shape, movement and internal transport

c) Only waste removal

d) Only food storage

Identify the key fact or definition described in the question.

10 / 30

10. What is the endoplasmic reticulum best described as?

a) A network-like organelle spread through the cytoplasm

b) A DNA storage body

c) A rigid outer wall

d) A pigment-containing plastid

Identify the key fact or definition described in the question.

11 / 30

11. Why does the potato piece in concentrated solution lose weight?

a) Proteins enter the potato

b) Water moves out toward the more concentrated solution

c) Salt is converted into water

d) Water moves into the potato from the solution

Identify the key fact or definition described in the question.

12 / 30

12. What do chromosomes contain that carries hereditary information?

a) ATP only

b) Lipids

c) Cellulose

d) DNA

Identify the key fact or definition described in the question.

13 / 30

13. Why is the membrane described as fluid?

a) Its molecules can move sideways, flip and rotate

b) It continuously dissolves

c) It has no proteins

d) It is made entirely of water

Identify the key fact or definition described in the question.

14 / 30

14. Why does the absence of a nucleus in mature human RBCs provide an advantage?

a) It produces more chromosomes

b) It stops oxygen transport

c) It provides more space for haemoglobin

d) It creates a cell wall

Identify the key fact or definition described in the question.

15 / 30

15. When extracellular solute concentration is higher than intracellular concentration, the extracellular solution is what?

a) Dilute

b) Isotonic

c) Hypotonic

d) Hypertonic

Identify the key fact or definition described in the question.

16 / 30

16. How does water enter plant root cells from soil?

a) By protein synthesis

b) By osmosis

c) By mitosis

d) By photosynthesis

Identify the key fact or definition described in the question.

17 / 30

17. Which infectious agents are described as acellular?

a) Protozoa, algae and animals

b) Viruses, viroids and prions

c) Bacteria, fungi and plants

d) RBCs, WBCs and platelets

Identify the key fact or definition described in the question.

18 / 30

18. In osmosis, water moves from an area with what condition toward an area with what condition?

a) More water and less solute to less water and more solute

b) More solute to less solute without water movement

c) Equal water to unequal temperature

d) Less water and less solute to more water and more solute

Identify the key fact or definition described in the question.

19 / 30

19. How does osmosis differ from diffusion as defined in the chapter?

a) Osmosis is diffusion of water across a selectively permeable membrane

b) Osmosis is movement of proteins without a membrane

c) Diffusion requires a nucleus

d) Diffusion is movement of water only through membranes

Identify the key fact or definition described in the question.

20 / 30

20. How does the cell wall help plant roots?

a) It destroys minerals

b) It produces food directly

c) It prevents all water entry

d) It helps roots absorb water and nutrients from soil along with the membrane's selective permeability

Identify the key fact or definition described in the question.

21 / 30

21. Why are organelles useful in eukaryotic cells?

a) They prevent all chemical reactions

b) They replace the cell membrane

c) They make cells non-living

d) They allow different life processes to occur independently at the same time

Identify the key fact or definition described in the question.

22 / 30

22. What role do proteins in the membrane play?

a) They produce chromosomes

b) They store starch

c) They act like gatekeepers for substances

d) They form cell walls

Identify the key fact or definition described in the question.

23 / 30

23. What do viroids lack?

a) All proteins

b) A protein coat around their genetic material

c) Any infectious ability

d) Genetic material

Identify the key fact or definition described in the question.

24 / 30

24. Where are ribosomal subunits synthesized?

a) In the lysosome

b) In the vacuole

c) In the chloroplast stroma

d) In the nucleolus

Identify the key fact or definition described in the question.

25 / 30

25. When extracellular solute concentration is lower than intracellular concentration, the extracellular solution is what?

a) Hypotonic

b) Hypertonic

c) Isotonic

d) Neutral

Identify the key fact or definition described in the question.

26 / 30

26. Why can mature human RBCs not repair or divide themselves?

a) They lack a membrane

b) They lack a nucleus

c) They lack cytoplasm

d) They lack haemoglobin

Identify the key fact or definition described in the question.

27 / 30

27. What do pores in the nuclear membrane allow?

a) Transfer of material between nucleus and cytoplasm

b) Cell division only

c) Water storage

d) Photosynthesis

Identify the key fact or definition described in the question.

28 / 30

28. What does the lipid bilayer contain on its outer side?

a) Water-attracting heads

b) Water-repelling heads

c) DNA strands

d) Ribosomes

Identify the key fact or definition described in the question.

29 / 30

29. What happens to chromatin when a cell is about to divide?

a) It changes into ATP

b) It disappears

c) It becomes a cell wall

d) It becomes organised into chromosomes

Identify the key fact or definition described in the question.

30 / 30

30. When extracellular and intracellular solute concentrations are equal, the solution is called what?

a) Saturated

b) Isotonic

c) Hypotonic

d) Hypertonic

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The average score is 0%

What This Quiz Covers

This quiz covers:

Structure and function of the cell membrane
Selectively permeable membranes
Movement of substances across the cell membrane
Diffusion
Osmosis
Concentration differences
Movement of water into and out of cells
Effects of different solutions on cells
Role of the cell wall
Structure and function of the plant cell wall
Cellulose in the cell wall
How the cell wall supports and protects plant cells
Differences between the cell membrane and cell wall
Everyday examples of osmosis and diffusion

Why Take This Quiz?

This quiz can help Class 9 students:

Revise important cell concepts
Understand diffusion and osmosis more clearly
Learn how the cell membrane controls movement
Understand the role of the plant cell wall
Practise multiple-choice questions
Prepare for school tests and exams
Find topics that need more revision
Test their understanding with real-life examples

The quiz includes questions that test both basic knowledge and understanding, so read each question carefully before choosing your answer.

Key Points

Keep these points in mind before you start:

Cell membrane: Controls the movement of substances into and out of the cell.
Selectively permeable: Allows some substances to pass through while restricting others.
Diffusion: Moves particles from higher concentration to lower concentration.
Osmosis: Moves water through a selectively permeable membrane.
Concentration: Shows how much of a substance is present in a particular space.
Cell wall: Provides support, strength and protection to plant cells.
Cellulose: Forms an important part of the plant cell wall.
Plant cells: Have both a cell membrane and a cell wall.
Animal cells: Have a cell membrane but do not have a cell wall.
Water movement: Osmosis can cause cells to gain or lose water depending on the surrounding solution.

Explore More Cell Quizzes

Finished this quiz? Continue your Class 9 Cell: The Building Block of Life revision with the other quizzes:

Cell Basics, Origin of Life, Cell Theory & Microscopes
Cell Types, Nucleus, DNA, ER, Ribosomes & Golgi
Lysosomes, Mitochondria, Plastids, Vacuoles & Organelles
Cell Growth, Division, Mitosis, Meiosis, Cancer & Applications

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Cell Membrane, Diffusion, Osmosis & Cell Wall Quiz for Class 9

Quiz Time

What This Quiz Covers

Why Take This Quiz?

Key Points

Explore More Cell Quizzes

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