Grain is eaten by cows, and cows are eaten by humans. If the ecological transfer
ID: 72651 • Letter: G
Question
Grain is eaten by cows, and cows are eaten by humans. If the ecological transfer efficiency between each trophic level is 10%, how much grain is required to produce 70 kg of human biomass? One would expect to find the greatest amount of biomass in a grassland or forest community in which of the following groups? Which of the following can cause a severe environmental problem through biological magnification? According to your textbook, the extinction of the dinosaurs about 65 million years ago was likely caused by a super volcano.Explanation / Answer
22. 7,000 kg. Ecological transfer efficiency is 10%, so 7,000 kg of grain makes a biomass of 700 kg of cows, and 700 kg of cows gives a biomass of 70 kg of human biomass.
23. Primary producers. The producers are always high in number and in terms of biomass also, to support the survival of other organisms that feed on the producers
24. PCBs. They are polychlorinated biphenyls which are synthetic chemicals used as pesticides. They accumulate in plants. When herbivores feed on these plants, the PCBs accumulate in them. Feeding on these herbivores leads to accumulation of PCBs in carnivores. In each trophic level, the concentration of PCBs increase due to accumulation of the compound. This is called biomagnification.
25. False. The dinosaurs became extinct possibly due to collision of a meteroid with the earth.
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