Population Interactions Quiz - CBSE Class 12 Biology

Free practice quiz: Population Interactions (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 Population Interactions, 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. Which of the following interactions is an example of commensalism?

   1. Predator-prey
   2. Parasitism
   3. Mutualism
   4. Cattle egret and grazing cattle
   Show answer

   Answer: D. Cattle egret and grazing cattle

   Commensalism is a symbiotic relationship where one species benefits and the other is neither harmed nor benefited. Cattle egrets benefit by feeding on insects disturbed by grazing cattle, while the cattle are unaffected.

2. Give an example of a parasite and its host.

   1. Lion and zebra
   2. Tick and dog
   3. Flower and bee
   4. Mycorrhizae and plant roots
   Show answer

   Answer: B. Tick and dog

   A parasite benefits at the expense of its host. Ticks feed on the blood of dogs, harming the host.

3. Describe the effects of a keystone species on its ecosystem.

   1. Minimal effect.
   2. Negative effects only.
   3. Positive effects only.
   4. Significant effects disproportionate to its abundance.
   Show answer

   Answer: D. Significant effects disproportionate to its abundance.

   A keystone species plays a critical role in maintaining the structure and diversity of its ecosystem, despite its relatively low abundance.

4. Explain how interspecific competition can lead to character displacement.

   1. Interspecific competition has no effect on character displacement.
   2. Character displacement increases competition.
   3. Character displacement leads to increased overlap in niches.
   4. Character displacement leads to evolutionary divergence in traits to minimize competition.
   Show answer

   Answer: D. Character displacement leads to evolutionary divergence in traits to minimize competition.

   Character displacement occurs when competing species evolve to reduce niche overlap, minimizing competition through divergence in traits like beak size or foraging behavior.

5. Analyze the influence of environmental factors on the strength and outcome of interspecific competition.

   1. Environmental factors have no influence.
   2. Environmental factors influence competition only in extreme conditions.
   3. Environmental factors significantly modify competition's intensity and outcome.
   4. Environmental factors only affect intraspecific competition.
   Show answer

   Answer: C. Environmental factors significantly modify competition's intensity and outcome.

   Environmental variables like resource availability, climate, and disturbance events can alter the competitive abilities of species and influence the outcome of competition.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What type of interaction is depicted when a lion hunts a zebra?
2. Describe the relationship between two species competing for the same limited resource.
3. Explain the concept of competitive exclusion principle.
4. Differentiate between parasitism and predation.
5. Explain the concept of resource partitioning and provide an example.
6. How does mimicry contribute to species interactions?
7. Explain the concept of ecological niche and its relevance to species interactions.
8. Analyze the impact of invasive species on native populations.
9. Discuss the role of coevolution in shaping species interactions.
10. Describe the factors influencing the outcome of competition between two species.
11. Discuss the complexities involved in modeling population interactions.
12. Evaluate the role of mathematical models in predicting the dynamics of predator-prey interactions.
13. Critically evaluate the limitations of using laboratory experiments to study complex ecological interactions in natural settings.
14. Propose a research design to investigate the effects of habitat fragmentation on the population dynamics of a specific endangered species and its interactions with other species.
15. Discuss the challenges in predicting long-term consequences of altering species interactions within an ecosystem, considering factors like cascading effects and non-linear responses.

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