GCSE Biology – Osmosis – Primrose Kitten

GCSE Biology – Osmosis

Last updated: 14/04/2021

Edexcel GCSE Science – Biology higher Key concepts in biology GCSE Biology – Osmosis

Learning Objectives

-I can define the term osmosis
-I can describe the process of osmosis

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Question 1 of 25

1. Question
What is the definition of osmosis?
- Net movement of water molecules from an area of higher to lower concentration across a partially permeable membrane
- Net movement of water molecules from an area of lower to higherr concentration
- Net movement of water molecules from an area of higher to lower concentration
- Net movement of water molecules from an area of higher to lower concentration across a membrane
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Question 2 of 25

2. Question
What is the definition of isotonic?
- Concentration of solutes outside cell is same as inside cell
- Concentration of solutes outside cell is higher than inside cell
- Concentration of solutes outside cell is lower than inside cell
- A sugary solution
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Question 3 of 25

3. Question
What is one definition of hypertonic?
- Concentration of solutes outside cell is higher than inside cell
- Concentration of solutes outside cell is same as inside cell
- A cell which is extremely sugary or salty
- All of these answers
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Question 4 of 25

4. Question
What is one definition of hypertonic?
- Concentration of solutes outside cell is lower than inside cell
- All of these answers
- Concentration of solutes outside cell is same as inside cell
- An outside solution which is very sugary or salty
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Question 5 of 25

5. Question
What is the definition of a partially permeable membrane?
- A membrane with very small holes
- An elastic-type membrane
- A membrane with no holes
- A membrane which lets all substances through
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Question 6 of 25

6. Question
Osmosis involves the movement of which molecules?
- Water molecules
- Carbon Dioxide molecules
- Oxygen molecules
- Glucose molecule
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Question 7 of 25

7. Question
How do water molecules move in osmosis?
- From an area of higher concentration to an area of lower concentration.
- Into the ribosomes of the cell
- From an area of lower concentration to an area of higher concentration
- Into the mitochondria
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Question 8 of 25

8. Question
What do water molecules move through in osmosis?
- A partially permeable membrane
- A permeable membrane
- An impermeable membrane
- Through the nuclear membrane
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Question 9 of 25

9. Question
What piece of equipment is used to show us water movement?
- An osmometer
- An anemometer
- An Ohmmeter
- A manometer
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Question 10 of 25

10. Question
Which substance cannot move through a partially permeable membrane?
- Protein molecules
- Water molecules
- Very small sugar molecules
- Simple sugars
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Question 11 of 25

11. Question
What happens when a cell has lots of water?
- Cytoplasm becomes more dilute, water leaves the cell
- Glucose
- Cytoplasm becomes more dilute, water enters the cell
- Cytoplasm becomes less dilute, water enters the cell
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Question 12 of 25

12. Question
What happens when a cell is short of water?
- Cytoplasm becomes more concentrated, water moves into the cell
- Cytoplasm becomes less concentrated, water leaves into the cell
- Cytoplasm becomes less concentrated, water moves into the cell
- Cytoplasm becomes more concentrated, water leaves the cell
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Question 13 of 25

13. Question
What is a similarity between osmosis and diffusion?
- Both have movement from higher to lower concentrations
- Both require energy
- Both have movement from lower to higher concentrations
- All of these answers
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Question 14 of 25

14. Question
What is the main difference between osmosis and diffusion?
- Osmosis is with water particles, diffusion is with other particles
- Osmosis does not require energy but diffusion does
- Osmosis is with other particles, diffusion is with water particles
- All of these answers
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Question 15 of 25

15. Question
What happens when plant cells lose too much water by osmosis?
- The cells become flaccid and the plant wilts
- The cells become turgid
- The plant cells completely die and the plant falls over
- The cells do not change as they are not affected by water loss
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Question 16 of 25

16. Question
If a gummy bear is left in water, what will happen?
- The gummy bear will expand
- The gummy bear will get smaller
- Nothing as osmosis does not occur
- The gummy bear
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Question 17 of 25

17. Question
Why does the gummy bear do this?
- Concentration of water is higher outside the gummy bear so water moves in
- Concentration of water is lower outside the gummy bear so water moves in
- Concentration of water is higher outside the gummy bear so water moves out
- Concentration of water is lower outside the gummy bear so water moves out
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Question 18 of 25

18. Question
What process is this?
- Osmosis
- Active Transport
- Diffusion
- Reverse osmosis
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Question 19 of 25

19. Question
If a potato sample is placed in an extremely sugary solution, what will happen?
- The potato will shrink
- There will be no change in potato size
- The potato will change colour
- The potato will expand
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Question 20 of 25

20. Question
Why does the potato sample do this?
- Concentration of water is lower outside the potato sample so water moves out
- Concentration of water is higher outside the potato sample so water moves out
- Concentration of water is higher outside the potato sample so water moves in
- Concentration of water is lower outside the gummy bear so water moves in
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Question 21 of 25

21. Question
A potato sample is placed in another solution and has no change in mass. What does this mean?
- The potato cells and the solution are isotonic
- Water could not enter the potato cells because the membrane was not partially permeable
- The potato cells and the solution are hypertonix
- The potato cells and the solution are hypotonic
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Question 22 of 25

22. Question
If plant cells lose water and the plant wilts, what will happen?
- Less photosynthesis will occur
- More photosynthesis will occur
- The plant will have faster growth
- No change in photosynthesis
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Question 23 of 25

23. Question
What word means a plant’s cells are bulging?
- Turgid
- Wilting
- Plasmolysed
- Strong
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Question 24 of 25

24. Question
How does turgor help a plant?
- Keeps leaves in best position for photosynthesis
- Provides an antimicrobial secretion
- Prevents organisms from feeding on the plant
- Allows the plant to survive low temperatures
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Question 25 of 25

25. Question
When a plant wilts, what stops it falling over?
- The cell wall of plant cells
- The cell membrane of plant cells
- Mitochondria in plant cells
- Glucose supports the plant
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