10 questions🇬🇧English
🥔 Diffusion, Osmosis & Active Transport – GCSE
Biology · GCSE — how substances move in and out of cells, from concentration gradients to the potato osmosis practical
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Questions
Which of these is the correct definition of diffusion?
Net movement of particles from low to high concentration
Movement of particles that needs energy from respiration
Movement of particles that only happens across membranes
Net movement of particles from high to low concentration
20s
In osmosis, water moves across a partially permeable membrane in which direction?
From the cell to its surroundings using energy
From a concentrated solution to a more dilute one
From a dilute solution to a more concentrated one
Always into the cell, whatever the solution
20s
How is active transport different from diffusion?
It moves particles down a concentration gradient
It only happens in plant cells
It only moves water molecules
It needs energy from respiration
20s
Which change would increase the rate of diffusion across a membrane?
Increasing the diffusion distance
Increasing the temperature
Decreasing the concentration difference
Decreasing the surface area
20s
What is the surface area to volume ratio of a cube with sides of 2 cm?
1:3
6:1
3:1
4:1
30s
A plant cell is placed in pure water. What happens to it?
It becomes plasmolysed as water leaves
It bursts as water enters by osmosis
It becomes turgid as water enters by osmosis
It becomes flaccid as water leaves
20s
Which description matches a plasmolysed plant cell?
The membrane has pulled away from the cell wall
The cell wall has burst open
The cell has gained water and become firm
The vacuole has swollen and presses on the wall
30s
A potato cylinder's mass falls from 2.50 g to 2.00 g in a sugar solution. What is the percentage change in mass?
−0.5%
−25%
+20%
−20%
30s
In the potato practical, what does the sugar concentration that causes no change in mass tell you?
It equals the concentration inside the potato cells
It is the concentration at which osmosis is fastest
It is the concentration at which all water has left
It is the concentration at which the cells burst
30s
Why do root hair cells absorb mineral ions from the soil by active transport rather than diffusion?
The ion concentration in the soil is higher than in the cell
Water leaving the root carries the ions inward
The ion concentration in the soil is lower than in the cell
Mineral ions cannot pass through the cell membrane
30s