BI-1656
Diffusion
Biology · Secondary 4 · Hard · Diffusion
A student compares diffusion of oxygen in two agar blocks of the same material. Block X is 1 cm thick and Block Y is 0.5 cm thick. Both are placed in air with the same oxygen concentration.
Which statement explains why oxygen reaches the centre of Block Y faster than Block X?
Which statement explains why oxygen reaches the centre of Block Y faster than Block X?
- Block Y has a larger surface area so diffusion does not occur.
- Block Y has a shorter diffusion distance to its centre.
- Block Y has a higher oxygen concentration inside it.
- Block Y has more oxygen molecules in the air around it.
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