Ecosystem Quiz - CBSE Class 11 Biology

Free practice quiz: Ecosystem (CBSE Class 11 Biology). 38 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 11 Biology practice quiz has 38 multiple-choice questions on Ecosystem. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is an ecosystem?

   1. A community of living organisms and their physical environment
   2. Only the living organisms in a particular area
   3. The abiotic components of the environment
   4. A group of similar species
   Show answer

   Answer: A. A community of living organisms and their physical environment

2. What is the primary difference between a food chain and a food web?

   1. A food chain is simpler and shows one path of energy flow
   2. A food chain includes producers and consumers only
   3. A food web is shorter than a food chain
   4. There is no difference
   Show answer

   Answer: A. A food chain is simpler and shows one path of energy flow

3. Which of the following is a result of climate change affecting ecosystems?

   1. Increased photosynthesis in all plants
   2. Changes in species distributions
   3. Uniformity of ecosystems
   4. Stability in food webs
   Show answer

   Answer: B. Changes in species distributions

4. What is the main source of energy for almost all ecosystems on Earth?

   1. Wind
   2. Water
   3. Sunlight
   4. Soil
   Show answer

   Answer: C. Sunlight

5. Which type of succession occurs on previously inhabited regions after a disturbance?

   1. Primary succession
   2. Secondary succession
   3. Climatic succession
   4. Geological succession
   Show answer

   Answer: B. Secondary succession

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following is an example of a biotic component in an ecosystem?
2. What term describes the maximum population size that an environment can sustain?
3. Which process involves the conversion of nitrogen gas into a form usable by plants?
4. What is the primary source of energy for nearly all ecosystems?
5. What is the role of decomposers in an ecosystem?
6. Which of the following best describes a food chain?
7. In a trophic pyramid, which level has the most available energy?
8. Which of the following ecosystems has the highest biodiversity?
9. What is the main consequence of habitat destruction?
10. How does bioaccumulation differ from biomagnification?
11. What role do keystone species play in an ecosystem?
12. Which concept refers to the variety of different species within an ecosystem?
13. What is the purpose of ecological succession?
14. Which process describes the interaction that occurs when two species compete for the same resource?
15. What is the main outcome of ecological interactions among organisms in an ecosystem?
16. What phenomenon describes the gradual change in species composition in an ecosystem over time?
17. In terms of energy flow, what is the significance of trophic cascades?
18. What term describes the role of an organism in its environment, including what it eats and how it interacts with other organisms?
19. Which of the following is primarily a producer in an ecosystem?
20. An interaction where both species benefit is known as:
21. In a food web, what do the arrows indicate?
22. Which of the following processes is a part of the carbon cycle?
23. Which level of ecological organization includes both biotic and abiotic components?
24. What is meant by 'trophic levels' in an ecosystem?
25. Which of the following organisms is an example of a primary consumer?
26. What is a consequence of biomagnification in a food chain?
27. In a stable ecosystem, a decrease in one species population will likely affect:
28. How does biodiversity enhance the resilience of an ecosystem?
29. The relationship between an oxpecker bird and a rhinoceros is an example of:
30. Which process in an ecosystem does NOT contribute to nutrient cycling?
31. What is the key factor determining the distribution of terrestrial biomes?
32. What is the primary cause of desertification?
33. Which of the following has a significant impact on global climate patterns?

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