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.
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Which of the following interactions is an example of commensalism?
- Predator-prey
- Parasitism
- Mutualism
- Cattle egret and grazing cattle
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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.
Give an example of a parasite and its host.
- Lion and zebra
- Tick and dog
- Flower and bee
- Mycorrhizae and plant roots
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Answer: B. Tick and dog
A parasite benefits at the expense of its host. Ticks feed on the blood of dogs, harming the host.
Describe the effects of a keystone species on its ecosystem.
- Minimal effect.
- Negative effects only.
- Positive effects only.
- Significant effects disproportionate to its abundance.
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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.
Explain how interspecific competition can lead to character displacement.
- Interspecific competition has no effect on character displacement.
- Character displacement increases competition.
- Character displacement leads to increased overlap in niches.
- Character displacement leads to evolutionary divergence in traits to minimize competition.
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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.
Analyze the influence of environmental factors on the strength and outcome of interspecific competition.
- Environmental factors have no influence.
- Environmental factors influence competition only in extreme conditions.
- Environmental factors significantly modify competition's intensity and outcome.
- Environmental factors only affect intraspecific competition.
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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.