19 Organisms and their environment

Practice questions on Organisms and their environment

• A population of bacteria is introduced to a nutrient-rich culture medium. Initially the po… (4 marks, Explain)
• Describe how food supply affects the rate of population growth of a species. (4 marks, Describe)
• Describe how nitrogen from a dead animal is returned to the atmosphere as nitrogen gas. (4 marks, Describe)
• A farmer decides to grow wheat and sell it directly for human consumption rather than usin… (4 marks, Explain)
• Explain why energy is lost as it passes from one trophic level to the next in a food chain… (4 marks, Explain)
• Describe how biomass changes at each trophic level in a food chain, and give two reasons w… (4 marks, Describe)
• A food chain in a woodland ecosystem has three trophic levels: oak trees → caterpillars → … (4 marks, Explain)
• A food chain has four trophic levels: grass → rabbit → fox → eagle. Suggest why there are … (4 marks, Suggest and Explain)
• Explain why energy is lost as it passes along a food chain, and state one consequence of t… (4 marks, Explain)
• A food web in a grassland ecosystem contains the following organisms: grass, grasshoppers,… (4 marks, Describe)
• A pond ecosystem contains the following organisms: phytoplankton, water fleas, small fish,… (4 marks, Describe)
• A woodland ecosystem contains oak trees, caterpillars, blue tits, and sparrowhawks. When h… (4 marks, Describe)
• A hedgerow ecosystem contains the following organisms: bramble plants, aphids, ladybirds, … (4 marks, Describe)
• Describe the role of microorganisms in the nitrogen cycle, including the names of the spec… (4 marks, Describe)
• Describe how carbon is cycled between the atmosphere and living organisms, including the r… (4 marks, Describe)
• Explain how carbon stored in fossil fuels is returned to the atmosphere and why this contr… (4 marks, Explain)
• Describe how nitrogen in the proteins of a living plant becomes available to other plants … (4 marks, Describe)
• Describe how predation affects the size of a prey population, and explain what happens to … (4 marks, Describe)
• A population of rabbits colonises a new area of grassland. At first the population grows s… (4 marks, Describe)
• A population of grey squirrels was introduced to a woodland where resources were limited. … (4 marks, Describe)