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Movement of Substances
Quick questions on Diffusion: N(A)-Level Biology Movement of Substances
4short 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 concentration gradient?Show answer
A concentration gradient is the difference in concentration between two regions. The bigger the difference, the steeper the gradient, and the faster diffusion happens. When the concentrations become equal, there is no longer a gradient, so there is no more net movement, although the particles keep moving randomly.
What is q1?Show answer
Define diffusion. [2 marks]
What is q2?Show answer
State whether diffusion needs energy from the cell, and give a reason. [2 marks]
What is q3?Show answer
Explain why the alveoli in the lungs have a very large surface area. [2 marks]
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