BI-2257
Aerobic respiration
Biology · Secondary 4 · Hard · Aerobic respiration
A scientist measures the rate of nitrate ion uptake by roots of two batches of plants, Q and R. Batch R is treated with cyanide, which stops aerobic respiration. At 30 h, batch Q absorbs nitrate at 0.8 mg/h, while batch R absorbs at 0.2 mg/h. Which statement best explains this difference?
- Batch Q has more ATP for active transport because aerobic respiration is not inhibited.
- Batch Q absorbs nitrate by diffusion, which needs more energy than active transport.
- Batch R has a higher nitrate concentration in the soil, so uptake is slower.
- Batch R uses osmosis instead of active transport, so more nitrate enters.
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