3 The natural environment and species survival

Practice questions on The natural environment and species survival

• A coral reef ecosystem contains the following food chain: phytoplankton → zooplankton → sm… (5 marks, Explain)
• Scientists have observed that some Arctic species, such as the polar bear, are facing thre… (5 marks, Explain)
• A population of wild wolves was once found across a vast continent. Around 10 000 years ag… (5 marks, Explain)
• A grassland ecosystem contains the following organisms: grass, grasshoppers, frogs, and ha… (5 marks, Explain)
• A species of freshwater fish lives in a large river. Due to a prolonged drought, the river… (5 marks, Explain)
• A species of ground-dwelling bird lives on a large island. The birds feed on seeds found o… (5 marks, Explain)
• A population of lizards lives on a large island. Over thousands of years, a mountain range… (5 marks, Describe)
• Explain how natural selection can lead to the formation of a new species (speciation). (5 marks, Explain)
• Methane and carbon dioxide are both greenhouse gases. Explain how an increase in the conce… (5 marks, Explain)
• Deforestation is one human activity that contributes to climate change. Explain how large-… (5 marks, Explain)
• A saltmarsh ecosystem contains the following food chain: cordgrass → marsh grasshoppers → … (5 marks, Explain)
• Carbon dioxide is a greenhouse gas released by human activities such as burning fossil fue… (5 marks, Explain)
• Climate change is causing global temperatures to rise. Explain how rising temperatures cou… (5 marks, Explain)
• A freshwater lake ecosystem contains the following food chain: aquatic plants → water flea… (5 marks, Explain)
• A woodland ecosystem contains oak trees, caterpillars, blue tits, and sparrowhawks arrange… (5 marks, Explain)
• A farmer grows two varieties of tomato plant in the same field. Variety A has broad, flat … (5 marks, Explain)
• A plant is kept in darkness for 48 hours and then moved into bright light. Explain what ha… (5 marks, Explain)
• Describe how the products of photosynthesis are used by a plant, and explain why photosynt… (5 marks, Describe)
• Photosynthesis is the process by which plants produce glucose. Explain how the raw materia… (5 marks, Explain)
• A student investigates the effect of light intensity on the rate of photosynthesis in pond… (5 marks, Explain)