Ecological Balance Quiz - CBSE Class 12 Biology

Free practice quiz: Ecological Balance (CBSE Class 12 Biology). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Biology practice quiz has 20 multiple-choice questions on Ecological Balance, and 20 of them come with an explanation. 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 does ecological balance refer to?

   1. Equal populations of different species
   2. Stable populations of organisms
   3. High biodiversity
   4. None of the above
   Show answer

   Answer: B. Stable populations of organisms

   Ecological balance refers to the stable populations of organisms within an ecosystem, ensuring a sustainable environment.

2. What is a keystone species?

   1. A species that has little impact on its environment
   2. A species that has a disproportionately large effect on its ecosystem
   3. A species that is invasive
   4. All of the above
   Show answer

   Answer: B. A species that has a disproportionately large effect on its ecosystem

   A keystone species plays a critical role in maintaining the structure of an ecological community, affecting many other organisms.

3. Which of the following statements about ecological succession is true?

   1. It always leads to climax communities
   2. Only occurs in terrestrial ecosystems
   3. Is a slow process where one set of plant communities replaces another
   4. Has no effect on biodiversity
   Show answer

   Answer: C. Is a slow process where one set of plant communities replaces another

   Ecological succession is the gradual process where ecosystems evolve over time, with one community gradually replacing another.

4. What is the consequence of overfishing in aquatic ecosystems?

   1. Increased fish populations
   2. Loss of biodiversity
   3. Enhanced water quality
   4. Improved ecosystem stability
   Show answer

   Answer: B. Loss of biodiversity

   Overfishing can lead to a decline in fish populations and a loss of biodiversity, disrupting the ecological balance in aquatic ecosystems.

5. What does 'carrying capacity' refer to?

   1. The maximum population size an environment can sustain
   2. The number of different species in an ecosystem
   3. The resources available in a habitat
   4. The number of predatory species present
   Show answer

   Answer: A. The maximum population size an environment can sustain

   'Carrying capacity' is the largest number of individuals an environment can support sustainably, important for maintaining ecological balance.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following is essential for maintaining ecological balance?
2. How does deforestation affect ecological balance?
3. Which of the following actions can help restore ecological balance?
4. What role do predators play in an ecosystem?
5. Which factor is NOT a direct contributor to ecological imbalance?
6. What is the impact of an invasive species on an ecosystem?
7. Why is biodiversity important for ecological balance?
8. Which term describes the variety of life in the world or in a particular habitat?
9. How do climate changes affect ecological balance?
10. What is ecological sustainability?
11. Which of the following is a characteristic of a stable ecosystem?
12. What happens when a predator is removed from an ecosystem?
13. What is the primary cause of climate change?
14. Which of the following is an example of a trophic cascade?
15. How can habitat fragmentation lead to ecological imbalance?

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