Level: JHS, Basic 8 | Subject: Integrated Science | Strand: Systems | Topic: Ecosystem (Energy Flow, Food Chains and Food Webs)
Read the summary notes first, then try these questions. Go back to the summary notes for this topic.
Part A has 20 tick-box questions. Part B has 5 essay questions with a marking guide at the bottom.
Test Yourself: 20 Objective Questions
Tick one answer for each question, then press Review answer. If your answer is wrong, it will be marked first, then the correct answer will show in green.
1. Every food chain begins with a
2. Which of these is a producer?
3. An organism that eats plants only is a
4. An animal that eats other animals only is a
5. An animal that eats both plants and animals is an
6. Which organisms break down dead plants and animals?
7. In the chain grass, grasshopper, frog, snake, the primary consumer is the
8. In the chain grass, grasshopper, frog, snake, the secondary consumer is the
9. The arrow in a food chain points
10. The main source of energy in an ecosystem is the
11. Many food chains joined together make a
12. Why are food webs more useful than single food chains?
13. About how much energy is passed from one feeding level to the next?
14. Food chains are usually short because
15. If all the snakes in a farm were killed, the number of rats would probably
16. In the chain algae, tilapia, catfish, fish eagle, the top consumer is the
17. The energy in the bodies of dead organisms is released by
18. Which of these is NOT a trophic level?
19. A pyramid of numbers is wide at the bottom because
20. Which of these shows a correct food chain?
Essay Questions
- Define the following: (a) producer (b) consumer (c) decomposer. Give one example of each. (6 marks)
- Write a food chain with four organisms found in a Ghanaian farm or forest and name the role of each. (5 marks)
- Draw a simple food web with at least six organisms from a grassland. (5 marks)
- Explain why energy decreases along a food chain. (4 marks)
- Describe what could happen to other organisms if all the frogs in a pond were removed. (3 marks)
Essay Questions: Marking Guide for Teachers and Parents
- Producer: a green plant that makes its own food, e.g. grass (2). Consumer: an organism that feeds on other organisms, e.g. goat (2). Decomposer: breaks down dead matter, e.g. a mushroom (2). One mark for each meaning and one for each example.
- A correct chain beginning with a producer, e.g. maize, rat, snake, hawk (2). Arrows in the right direction (1). Roles named correctly: producer, primary consumer, secondary consumer, tertiary consumer (2).
- At least six organisms shown (2). Arrows correct (2). Starts with producers and ends with a top consumer (1).
- Organisms use much of the energy for movement, growth and keeping warm (1). Some energy is lost as heat (1). Some parts are not eaten or digested (1). Only about 10% passes to the next level (1).
- Animals that eat frogs would have less food (1). Insects that frogs eat would increase (1). The balance in the pond would be disturbed (1).
Education Always (education.inspiringalways.com). Original practice questions, not official WAEC or BECE questions.
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