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.

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
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   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
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   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
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   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
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   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
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   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.

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