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osmosis
The definition concerns water and a water-potential gradient.
University admission · Other / specialist pathway · Biology
Biology for the selected science pathway
Interpret cellular and ecological mechanisms through an evidence-based answer.
Original Model Test for Exam unit. These questions and suggested practice times are independent Kidemy material, not an official or past paper. Choose modules for the target programme; all listed subjects are not required for every applicant.
Learn the idea
A biological explanation should connect cause and mechanism. Osmosis is net water movement across a selectively permeable membrane down a water-potential gradient. Population estimates and genetic predictions depend on model assumptions; a numerical result alone is not a diagnosis or a universal rule.
Worked example
In a simplified cell model without a wall, net water entry can increase cell volume. A plant cell wall resists expansion and supports turgor. Solute concentration alone needs care when pressure effects matter.
- Identify the system and membrane.
- Explain the direction with the appropriate gradient.
- State a limit of the model.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
Show model answer and explanation
cell wall
The wall supports turgor pressure.
Show model answer and explanation
15
30/2=15.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
The cell wall changes how volume and pressure respond to water entry.
Link a structural difference to the mechanism.
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Show model answer and explanation
Its location may overrepresent a dense or sparse patch.
Identify selection and spatial variation.
Biology model test
Draw a membrane model and critique a sampling plan.
Review with a guardian or teacher
- Label direction and conditions.
- Explain a mechanism.
- Separate a model from a personal health decision.
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