Environment and Ecosystems

Practice past-paper questions

Practise O/L exam questions on Environment and Ecosystems with worked solutions

1. 2020 · Paper II · 5 marks
   The diagram shows a food chain in a garden: Cabbage → Caterpillar → Frog → Snake → Hawk. (i) Identify the producer and the apex predator. (ii) What would happen to the frog population if all the snakes were removed? Explain. (iii) Define the term 'ecosystem'.
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   (i) Producer: Cabbage. Apex predator: Hawk. (ii) The frog population would INCREASE because the snake (frog's predator) is removed; fewer frogs are eaten. Over time caterpillar numbers would decrease because more frogs eat them. (iii) An ecosystem is a community of living organisms interacting with each other and with their non-living environment in a particular area.
   Source: NIE O/L Science 2020 Paper II Q10

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