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Transport in Plants

Osmosis and Diffusion Practice Questions

19 free Osmosis and Diffusion practice questions for the NCERT Biology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 19 Medium

Diffusion is the movement of molecules from:

  1. A Low to high concentration
  2. B High to low concentration
  3. C Equal concentration
  4. D Inside to outside only

Correct answer: High to low concentration

Diffusion occurs from a region of higher concentration to lower concentration. It is a passive process.

Question 2 of 19 Medium

Which process requires a semi-permeable membrane?

  1. A Diffusion
  2. B Osmotic process
  3. C Active transport
  4. D Transpiration

Correct answer: Osmotic process

Osmosis specifically requires a semi-permeable membrane. Diffusion does not necessarily require one.

Question 3 of 19 Medium

Which type of transport does not require energy?

  1. A Primary active transport
  2. B Osmosis and diffusion
  3. C Endocytosis
  4. D Exocytosis

Correct answer: Osmosis and diffusion

Osmosis and diffusion are passive processes. They do not require ATP for movement.

Question 4 of 19 Medium

Water moves into a plant cell when it is placed in a:

  1. A Hypertonic solution
  2. B Isotonic solution
  3. C Hypotonic solution
  4. D Concentrated solution

Correct answer: Hypotonic solution

In a hypotonic solution, water enters the cell due to higher external water potential. This causes the cell to become turgid.

Question 5 of 19 Medium

Which factor does NOT affect the rate of diffusion?

  1. A Concentration gradient
  2. B Temperature
  3. C Surface area
  4. D DNA content

Correct answer: DNA content

DNA content does not influence diffusion. Diffusion depends on gradient, temperature, and surface area.

Question 6 of 19 Medium

Which term describes the movement of water into the cell?

  1. A Exosmosis
  2. B Diffusion
  3. C Translocation
  4. D Endosmosis

Correct answer: Endosmosis

Endosmosis is the movement of water into the cell. It occurs in hypotonic conditions.

Question 7 of 19 Medium

Which condition results in no net movement of water?

  1. A Hypertonic solution
  2. B Hypotonic
  3. C Isotonic solution
  4. D Concentrated

Correct answer: Isotonic solution

In isotonic conditions, water moves equally in both directions. There is no net movement.

Question 8 of 19 Medium

Which of the following is a passive transport process?

  1. A Active transport
  2. B Endocytosis
  3. C Pinocytosis
  4. D Osmotic process

Correct answer: Osmotic process

Osmosis is a passive process. It does not require energy and depends on water potential gradient.

Question 9 of 19 Medium

Diffusion can occur in:

  1. A Liquid solutions only
  2. B Gases only
  3. C Solids only
  4. D All states of matter

Correct answer: All states of matter

Diffusion occurs in solids, liquids, and gases. However, it is fastest in gases.

Question 10 of 19 Medium

Which membrane property is essential for osmosis?

  1. A Permeable to solute
  2. B Completely impermeable to water
  3. C Rigid structure
  4. D Semi-permeable to solvent

Correct answer: Semi-permeable to solvent

A semi-permeable membrane allows only solvent (water) to pass. It restricts solute movement.

Question 11 of 19 Medium

Which process helps in gas exchange in plant leaves?

  1. A Diffusion
  2. B Osmosis
  3. C Active transport
  4. D Transpiration

Correct answer: Diffusion

Gas exchange occurs by diffusion. Oxygen and carbon dioxide move along concentration gradients.

Question 12 of 19 Medium

Which factor increases the rate of diffusion?

  1. A High concentration gradient
  2. B Low temperature
  3. C Extremely small surface area
  4. D High viscosity

Correct answer: High concentration gradient

A higher concentration gradient increases diffusion rate. It provides a stronger driving force.

Question 13 of 19 Medium

Which type of solution has higher solute concentration than the cell?

  1. A Hypotonic
  2. B Isotonic
  3. C Hypertonic
  4. D Neutral solution

Correct answer: Hypertonic

Hypertonic solutions have higher solute concentration. They draw water out of the cell.

Question 14 of 19 Medium

Which type of solution has lower solute concentration than the cell?

  1. A Hypertonic
  2. B Isotonic
  3. C Hypotonic
  4. D Concentrated

Correct answer: Hypotonic

Hypotonic solutions have lower solute concentration. They cause water to enter the cell.

Question 15 of 19 Medium

Which of the following best describes osmosis?

  1. A Movement of water across a membrane
  2. B Movement of solutes
  3. C Only active transport of charged ions
  4. D Protein transport

Correct answer: Movement of water across a membrane

Osmosis is the movement of water across a semi-permeable membrane. It is driven by water potential difference.

Question 16 of 19 Medium

Which process is faster in gases compared to liquids?

  1. A Diffusion
  2. B Osmosis
  3. C Active transport
  4. D Translocation

Correct answer: Diffusion

Diffusion occurs faster in gases due to greater molecular movement. It is slower in liquids and solids.

Question 17 of 19 Medium

Which structure in plant cells regulates osmosis?

  1. A Plasma membrane
  2. B Cell wall
  3. C Nucleus
  4. D Chloroplast membrane

Correct answer: Plasma membrane

The plasma membrane is selectively permeable. It controls the movement of water and solutes.

Question 18 of 19 Medium

Which process is responsible for water uptake by plant roots?

  1. A Osmotic process
  2. B Diffusion
  3. C Active transport
  4. D Respiration

Correct answer: Osmotic process

Water enters root cells mainly by osmosis. It moves from soil (higher water potential) to root cells (lower).

Question 19 of 19 Medium

Which statement is true for diffusion?

  1. A Requires energy
  2. B Occurs against gradient
  3. C Occurs down the gradient
  4. D Requires membrane always

Correct answer: Occurs down the gradient

Diffusion occurs down the concentration gradient. It does not require energy input.

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