B1.5 Energy and biomass in food chains食物链中的能量与生物量.doc

B1.5 Energy and biomass in food chains食物链中的能量与生物量 2. The diagram shows a food chain. Use the information shown in the food chain to help you answer the questions. (a) This food chain can also be drawn as a pyramid of biomass. (i) Explain what is meant by the word biomass. ......................................................................................................................................................... [1] (ii) Finish the pyramid by writing the biomass at each stage. [1] (iii) Energy is passed on through the food chain. What is the source of energy for the plants? ...............................................................................................................................[1] (b) Energy is lost from each stage of the food chain. Write down two ways in which energy is lost. 1. ......................................................................................................................................... 2. ......................................................................................................................................... [2] [Total: 5] Answer: 2(a)i Mass of living material; 2(a)ii 15000; 83000; 850000; 2(a)iii Sun; 2(b) Any Two from: Respiration; Heat; Excretion; Moving; Uneaten parts; Death;  3 Look at the food chain found in Africa. Grass → zebras → lions (a) (i) Grass is the producer in this food chain. What does the word producer mean? ..................................................................................................................................... [1] (ii) The zebras and lions are consumers in this food chain. What does the word consumer mean? ........................................................................................................................................... [1] (b) The diagram shows how a lion transfers energy (i) For every 1000 kJ of food energy, how much energy does the lion use for growth?.........................................