BI-1682
Diffusion
Biology · Secondary 4 · Hard · Diffusion
A plant’s roots absorb four dissolved substances, P, Q, R and S. The masses absorbed in one hour are shown.
- In the presence of oxygen: P = 1.0 g, Q = 3.0 g, R = 4.0 g, S = 5.0 g
- In the absence of oxygen: P = 0.9 g, Q = 1.4 g, R = 3.7 g, S = 1.0 g
Which conclusion is best?
- In the presence of oxygen: P = 1.0 g, Q = 3.0 g, R = 4.0 g, S = 5.0 g
- In the absence of oxygen: P = 0.9 g, Q = 1.4 g, R = 3.7 g, S = 1.0 g
Which conclusion is best?
- P and R are mainly absorbed by active transport.
- Q and S are mainly absorbed by active transport.
- P, Q, R and S are absorbed only by diffusion.
- Q and S are absorbed only by diffusion.
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