OCR_AS Level Biology A_H020-01 Question Paper Oct 2021 Breadth in Biology

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1 Which of the options, A to D, describes the role of CITES? A making conservation a part of normal farming practices B restricting the trade in individuals of endangered species C stopping the mov... ement of endangered species D requiring countries to develop strategies for sustainable development Your answer [1] 2 Which of the options, A to D, would result in the formation of tissue fluid? A hydrostatic pressure 1 oncotic pressure B hydrostatic pressure = oncotic pressure C oncotic pressure 1 hydrostatic pressure D oncotic pressure H hydrostatic pressure Your answer [1] 3 Which of the options, A to D, on the diagram below shows the time at which the SAN sends out a wave of excitation to initiate a heartbeat? 0 Time (s) Left ventricle 4 The sounds of the heartbeat due to heart valves closing can be described as ‘lub-dub’. The ‘lub’ sound occurs at the beginning of ventricular systole. Which of the options, A to D, describes what is happening when the ‘lub’ sound is heard? A semilunar valves opening and blood entering the ventricles B semilunar valves closing and blood entering the ventricles C atrio-ventricular valves opening and blood leaving the ventricles D atrio-ventricular valves closing and blood leaving the ventricles Your answer [1] 5 The rate of transpiration of water can be estimated by recording the rate of water uptake using a potometer. Two potometers were set up, one with large leaves and one with small leaves. A calibrated capillary tube that had a diameter of 1 mm was used to introduce the bubble. Which of the options, A to D, shows the most appropriate units to compare the rate of transpiration of large leaves compared to small leaves? A mm2 cm–1 min–1 B mm3 cm–1 min C mm2 cm–2 min–1 D mm3 cm–2 min–1 [Show More]

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