Movement in and out of Cells
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Diffusion
SubtopicDiffusion under Movement in and out of Cells for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of these structures is adapted for diffusion by having a large surface area?
A.The root hair cell
B.The lens of the eye
C.The spinal cord
D.The esophagus
- 2.
Which process describes the movement of particles from a region of their higher concentration to a region of their lower concentration?
A.Diffusion
B.Osmosis
C.Active Transport
D.Phagocytosis
- 3.
What provides the kinetic energy for particles to diffuse?
A.Gravity
B.Thermal energy (heat)
C.Chemical bonds
D.Electricity
- 4.
Which part of a plant cell is fully permeable and does not act as a barrier to diffusion?
A.Cell membrane
B.Cell wall
C.Vacuole
D.Nucleus
- 5.
Which statement best summarizes the process of diffusion?
A.It is the net movement of particles from a region of their higher concentration to a region of their lower concentration.
B.It is the movement of water molecules through a semi-permeable membrane.
C.It is the process of cells taking in large particles by engulfing them.
D.It is the movement of molecules that requires a protein carrier and energy.
- 6.
What provides the energy for the diffusion of water vapor out of a leaf?
A.The plant's metabolic energy.
B.The kinetic energy of the water molecules.
C.The suction force from the roots.
D.The pressure of the air outside the leaf.
- 7.
A molecule is diffusing across a distance of . If the distance is reduced to , what happens to the time taken for a molecule to diffuse?
A.The time taken increases.
B.The time taken decreases.
C.The time taken stays exactly the same.
D.The time taken depends only on the volume of the cell.
- 8.
Which statement best describes the limitation of diffusion in a single-celled organism as it increases in size?
A.The distance to the center becomes too long, but the surface area remains sufficient.
B.The surface area becomes too small to supply the needs of the increasing volume.
C.The volume decreases, making diffusion unnecessary.
D.The cell membrane thickens as the cell grows, blocking diffusion.
- 9.
How does the 'solubility' of a gas in the moisture film of the alveoli affect its diffusion into the blood?
A.Gases must dissolve in the moisture film before they can diffuse across the alveolar and capillary walls.
B.The moisture film acts as a barrier that slows down diffusion significantly.
C.The moisture film only allows nitrogen to pass through.
D.Solubility has no effect; only the concentration in the air matters.
- 10.
Which of the following is a direct consequence of the kinetic theory of matter in the process of diffusion?
A.Molecules move from high pressure to low pressure only.
B.Heavier molecules diffuse faster than lighter molecules at the same temperature.
C.Increasing temperature increases the speed of molecular motion.
D.Diffusion requires the presence of a living membrane.
Download the worksheet for Movement in and out of Cells - Diffusion to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
What is the net movement of water when the water potential gradient is zero?
A.Very fast movement
B.Zero net movement
C.Movement into the cell only
D.Movement out of the cell only
- 2.
Which of the following describes the texture of a plant tissue that has lost a lot of water?
A.Turgid and crunchy
B.Soft and limp
C.Hard and brittle
D.Cold and wet
- 3.
If the concentration of solutes inside a cell is 2% and the concentration outside is 10%, in which direction will water move?
A.Into the cell
B.Out of the cell
C.No net movement
D.Solutes will move into the cell
- 4.
Which process explains why a wilted flower becomes upright again after being placed in a vase of water?
A.Respiration
B.Osmosis
C.Translocation
D.Active transport
- 5.
A plant cell is placed in a concentrated sugar solution. The diagram represents the change in the cell over time as water moves out of the cell. Which statement correctly describes the resulting change in the cell sap inside the vacuole?
A.The concentration of the cell sap increases and the water potential decreases
B.The concentration of the cell sap increases and the water potential increases
C.The concentration of the cell sap decreases and the water potential decreases
D.The concentration of the cell sap decreases and the water potential increases
- 6.
How do dissolved solutes affect the movement of water?
A.They attract water molecules, effectively lowering the water potential.
B.They push water molecules away, increasing the water potential.
C.They occupy the pores in the membrane, stopping water movement.
D.They provide energy for water to move by active transport.
- 7.
Which of these solutions has the lowest water potential?
A.of salt in water
B.of salt in water
C.of salt in water
D.of salt in water
- 8.
Why does a piece of wilted lettuce become crisp again when placed in cold water?
A.Water enters the cells by osmosis, increasing the turgor pressure against the cell walls.
B.Cold water causes the cell walls to contract and become thicker.
C.The lettuce cells absorb solutes from the water, which strengthens the membrane.
D.Active transport moves water into the vacuoles to restore structure.
- 9.
A plant cell with kPa and kPa is placed in a solution with kPa. What will happen?
A.Water will enter the cell because the cell's is kPa.
B.Water will leave the cell because the cell's is kPa.
C.Water will enter the cell because the cell's is kPa.
D.No net movement will occur.
- 10.
Which of the following best describes the 'water potential' of a solution?
A.The total amount of water present in the solution.
B.The ability of water molecules to move freely in a system.
C.The pressure exerted by the solvent against the container walls.
D.The rate at which water evaporates from the solution.
Download the worksheet for Movement in and out of Cells - Osmosis to practice offline. It includes additional chapter-level practice questions.
Active transport
SubtopicActive transport under Movement in and out of Cells for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of the following is moved by active transport in the root hair cells of plants?
A.Nitrate ions
B.Starch grains
C.Oxygen molecules
D.Chlorophyll
- 2.
In which process does the cell use energy to 'pick up' molecules?
A.Active transport
B.Evaporation
C.Diffusion
D.Osmosis
- 3.
What are the specialized proteins in the cell membrane used for active transport called?
A.Enzymes
B.Antigens
C.Carrier proteins or pumps
D.Structural lipids
- 4.
If a cell's respiration rate increases, what is likely to happen to the rate of active transport?
A.It will decrease
B.It will increase
C.It will stop
D.It will be unaffected
- 5.
Why is active transport essential for plants growing in soil with low mineral content?
A.It allows them to lose excess water.
B.It allows them to take up minerals against a concentration gradient.
C.It prevents minerals from leaving the roots by diffusion.
D.It helps the plant to produce its own minerals through energy use.
- 6.
In a laboratory experiment, a tissue is treated with a chemical that denatures proteins. Which process will stop?
A.Diffusion of oxygen
B.Active transport of glucose
C.Osmosis of water
D.Evaporation of water
- 7.
Which of the following is a characteristic of active transport?
A.It only occurs in dead cells.
B.It requires a high concentration of the substance outside the cell.
C.It can only take place across a living cell membrane.
D.It is driven by the kinetic energy of the particles being transported.
- 8.
Why does increasing the concentration of glucose in the blood (within normal limits) increase the rate of active transport in the small intestine?
A.It provides more substrate for the respiration that powers the pumps.
B.It increases the concentration gradient for glucose absorption.
C.It makes the mucus in the intestine less viscous.
D.It signals the carrier proteins to work faster via hormones.
- 9.
Which of the following is a direct consequence of active transport failing in a human cell?
A.Accumulation of toxic waste products inside the cell.
B.Inability to maintain correct osmotic pressure and ion balance.
C.Rapid increase in the rate of photosynthesis.
D.The cell membrane becoming thicker and more rigid.
- 10.
A cell is treated with a chemical that makes the cell membrane 'leaky' to ions. How will the cell respond to maintain its internal ion concentration?
A.It will stop all active transport to save energy.
B.It will increase the rate of active transport, provided it has enough ATP.
C.It will decrease the rate of respiration to prevent further leakage.
D.It will change its shape to reduce its surface area.
Download the worksheet for Movement in and out of Cells - Active transport to practice offline. It includes additional chapter-level practice questions.