Ecosystem and Food Chains

Grade 8 Science — Ecosystem and Food Chains: 25 practice questions with instant scoring and explanations.

1. Producers in an ecosystem are primarily:
2. Primary consumers in a food chain feed on:
3. Decomposers in an ecosystem include:
4. A food chain typically starts with:
5. In the food chain grass → rabbit → fox, the rabbit is a:
6. In the food chain grass → rabbit → fox, the fox is a:
7. The 10% energy rule in ecosystems states that:
8. If a plant has 10,000 units of energy, a primary consumer feeding on it will have approximately:
9. The number of organisms at each trophic level typically:
10. A food web is different from a food chain because it:
11. Biomagnification refers to:
12. Which level of a food chain stores the most energy?
13. Omnivores are organisms that:
14. In an ecosystem, the role of decomposers is to:
15. If a pesticide is used on crops, it will show highest concentration in:
16. The transfer of energy in an ecosystem is:
17. Trophic levels in an ecosystem are distinguished by:
18. Which statement about energy flow in ecosystems is correct?
19. Scavengers in an ecosystem feed on:
20. In a marine ecosystem, phytoplankton serves as:
21. A pyramid of energy always shows:
22. If all the herbivores in an ecosystem suddenly disappear, the primary effect would be:
23. The concept of a food web is important because it:
24. Apex predators in an ecosystem are:
25. Nutrients in an ecosystem, unlike energy, are: