OCR A-Level Biology A (H420) · OCR H420
5 Communication, homeostasis and energy
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Communication, homeostasis and energy
- Explain why a large surface area to volume ratio makes it more difficult for an organism t… (4 marks, Explain)
- Explain why the concentration of urea in the blood supplying the liver is higher than the … (4 marks, Explain)
- Explain why the loop of Henle is essential for the production of concentrated urine in mam… (4 marks, Explain)
- A student investigating action potentials places two recording electrodes on the outer sur… (4 marks, Explain)
- A student investigates the effect of a toxin on nerve impulse transmission. The toxin bloc… (4 marks, Explain)
- Explain why the refractory period is essential for the transmission of nerve impulses alon… (4 marks, Explain)
- Explain why the rate of photosynthesis in a C3 plant decreases during a period of water st… (4 marks, Explain)
- Explain why the effects of adrenaline on target cells are short-lived compared with the ef… (4 marks, Explain)
- Explain why the hormonal response to a stressor is slower to begin but longer lasting than… (4 marks, Explain)
- Explain why auxin causes differential growth on the shaded side of a shoot tip when the sh… (4 marks, Explain)
- Explain how the closure of stomata in a leaf is brought about when a plant experiences wat… (4 marks, Explain)
- Explain why the rate of ATP production in a cell is significantly reduced when a metabolic… (4 marks, Explain)
- Explain why the rate of photosynthesis in a C3 plant does not continue to increase indefin… (4 marks, Explain)
- A student claims that the electron transport chain is responsible for most of the ATP prod… (4 marks, Explain)
- Explain why a muscle cell that is actively contracting continues to produce lactate even w… (4 marks, Explain)
- Explain why the rate of ATP production in a cell would decrease significantly if the inner… (4 marks, Explain)
- Explain why a muscle cell that is actively contracting requires a continuous supply of red… (4 marks, Explain)
- Explain why the rate of photosynthesis in a C3 plant does not continue to increase indefin… (4 marks, Explain)
- Explain why the rate of photosynthesis in a plant does not continue to increase indefinite… (4 marks, Explain)
- Explain why the rate of photosynthesis in a plant cell does not continue to increase indef… (4 marks, Explain)
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