Organisms and Populations MCQs with answers

Dear candidates you will find MCQ questions of 12th Class - Biology | Chapter: Organisms and Populations here. Learn these questions and prepare yourself for coming examinations. You can check the right answer of any question by clicking the option or by clicking view answer button.
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Q. Animals from colder climates generally have shorter limbs. This is called
  • (A) Niche rule
  • (B) Arber’s rule
  • (C) Johnson’s rule
  • (D) Allen’s rule
💬 Discuss
✅ Correct Answer: (D) Allen’s rule
Q. Niche is defined as
  • (A) all plants and animals living at the bottom of a water body
  • (B) the physical position and functional role of a species within the community
  • (C) an ecologically adapted zone of a species
  • (D) a component of an ecosystem
💬 Discuss
✅ Correct Answer: (B) the physical position and functional role of a species within the community
Q. It natality is balanced by mortality in a population at a given time, there will be a/an
  • (A) decrease in the population size
  • (B) increase in the population size
  • (C) zero population growth
  • (D) population explosion
💬 Discuss
✅ Correct Answer: (C) zero population growth
Q. Mycorrhiza is an example of
  • (A) predation
  • (B) endoparasitism
  • (C) mutualism
  • (D) ectoparasitism
💬 Discuss
✅ Correct Answer: (C) mutualism
Q. The interspecific interaction in which one partner is benefitted and the other is unaffected (neutral), is called
  • (A) commensalism
  • (B) competition
  • (C) mutualism
  • (D) amensalism
💬 Discuss
✅ Correct Answer: (A) commensalism
Q. Individuals of one kind, i.e., one species occupying a particular geographic area, at a given time form a/an
  • (A) deme
  • (B) population
  • (C) biome
  • (D) community
💬 Discuss
✅ Correct Answer: (B) population
Q. What parameters are used for tiger census in our country’s national parks and sanctuaries?
  • (A) Pug marks only
  • (B) Pug marks and faecal pellets
  • (C) Faecal pellets only
  • (D) Actual head counts
💬 Discuss
✅ Correct Answer: (B) Pug marks and faecal pellets
Q. Which of the following would necessarily decrease the density of a population in a given habitat?
  • (A) Natality > mortality
  • (B) Immigration > emigration
  • (C) Mortality and emigration
  • (D) Natality and immigration
💬 Discuss
✅ Correct Answer: (C) Mortality and emigration
Q. A population has more young individuals compared to the older individuals. What would be the status of the population after some years?
  • (A) It will decline
  • (B) It will stabilise
  • (C) It will increase
  • (D) It will first decline and then stabilise
💬 Discuss
✅ Correct Answer: (C) It will increase
Q. Amensalism is an association between two species where
  • (A) one species is harmed and other is benefitted
  • (B) one species is harmed and other is unaffected
  • (C) one species is benefitted and other is unaffected
  • (D) both the species are harmed
💬 Discuss
✅ Correct Answer: (B) one species is harmed and other is unaffected
Q. Niche overlap indicates
  • (A) mutualism between two species
  • (B) two different parasites on the same host
  • (C) active cooperation between two species
  • (D) sharing of one or more resources between the two species
💬 Discuss
✅ Correct Answer: (D) sharing of one or more resources between the two species
Q. The formula of exponential population growth curve, is
  • (A) dN/dt = rN
  • (B) dt/dN rN
  • (C) dN/rN = dt
  • (D) rN/dN = dt
💬 Discuss
✅ Correct Answer: (D) rN/dN = dt

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Table of contents

  1. Animals from colder climates generally have shorter limbs. This is called
  2. Niche is defined as
  3. It natality is balanced by mortality in a population at a given time, there will be a/an
  4. Mycorrhiza is an example of
  5. The interspecific interaction in which one partner is benefitted and the other is unaffected (neutra
  6. Individuals of one kind, i.e., one species occupying a particular geographic area, at a given time f
  7. What parameters are used for tiger census in our country’s national parks and sanctuaries?
  8. Which of the following would necessarily decrease the density of a population in a given habitat?
  9. A population has more young individuals compared to the older individuals. What would be the status
  10. Amensalism is an association between two species where
  11. Niche overlap indicates
  12. The formula of exponential population growth curve, is

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