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Movement of Substances
Quick questions on Osmosis: N(A)-Level Biology Movement of Substances
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the partially permeable membrane?Show answer
A partially permeable membrane has tiny holes that let small water molecules pass through but hold back larger solute molecules such as sugar. The cell membrane is partially permeable, so water can move in and out by osmosis while sugars and salts stay put. This is why osmosis only moves water.
What are animal cells in different solutions?Show answer
Animal cells have no cell wall, so they are easily damaged.
What is q1?Show answer
Define osmosis. [2 marks]
What is q2?Show answer
State the term used to describe a plant cell that is firm and full of water. [1 mark]
What is q3?Show answer
Explain why a red blood cell bursts in pure water but a plant cell does not. [2 marks]
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