Solutions to these questions can be found here 1) Identify TWO responses of a named endotherm to a decrease in body temperature. (2 marks) 2) Outline the role of the nervous system of an endotherm in maintaining homeostasis when its body temperature changes. (2 marks) 3) As altitude increases, the partial pressure of oxygen (pO2) in air decreases. Species A and B are closely related endotherms that live in different habitats in Asia. The minimum pO2 required for 100% blood oxygen saturation differs in these species because of differences in their haemoglobin structure. Data related to these two species are shown below. Explain how the differences in these species could have arisen, using the Darwin/ Wallace theory of evolution and your understanding of the adaptive advantage of haemoglobin. (8 marks) 4) Name an Australian ectotherm and describe its response to a decrease in ambient temperature. (2 marks) 5) Some students investigated the response of a plant cutting to an increase in ambient air temperature. Their data are shown below. The benefit for the plant of this response would be a decrease in the: A) rate of transpiration. B) rate of photosynthesis. C) temperature of the plant. D) amount of water in the plant 6) Sunken stomata can be found in the leaves of some Australian plants. A section of such a leaf is shown. How do sunken stomata assist the plant to conserve water in a dry environment?
A) They trap moist air, reducing humidity B) They prevent entry of gases into the leaf. C) They accumulate moist air, reducing transpiration. D) They increase the surface area available for transpiration. 7) Why do some ectotherms bask in the sun? A) To absorb vitamin D B) To increase their activity C) To decrease their metabolic rate D) To constrict blood vessels close to the skin
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