Organisms and Populations MCQ Questions for Class 12 Biology Chapter 13 with Answers

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NCERT MCQ Chapters for Class 12 Biology


Q1. 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


(B) Pug marks and faecal pellets


Q2. Two different species cannot live for long duration in the same niche or habitat. This law is called

(A) Allen’s law
(B) Glogerrule
(C) Competitive exclusion principle
(D) Weisman’s theory.


(B) Glogerrule


Q3. A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

(A) 128
(B) 24
(C) 64
(D) 32.


(C) 64


Q4. In a population, unrestricted reproductive capacity is called

(A) Biotic potential
(B) Birth rate
(C) Fertility
(D) Carrying capacity


(A) Biotic potential


Q5. The rate of individuals born per 1,000 individuals per year is called

(A) Mortality rate
(B) Growth rate
(C) Vital rate
(D) Natality rate


(D) Natality rate


Q6. According to Allen’s Rule, the mammals from colder climates have:

(A) shorter ears and longer limbs
(B) longer ears and shorter limbs
(C) longer ears and longer limbs
(D) shorter ears and shorter limbs.


(D) shorter ears and shorter limbs.


Q7. Characteristics of a terrestrical biome are strongly influenced by its

(A) flora
(B) climate
(C) fauna
(D) all of these.


(B) climate


Q8. The interspecific interaction in which one partner is benefitted and the other is unaffected (neutral), is called

(A) amensalism
(B) mutualism
(C) competition
(D) commensalism


(D) commensalism


Q9. 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


(C) Mortality and emigration


Q10. Competitive exclusion principle stating that inferior species is eliminated eventually after prolonged competition was given by

(A) Allen
(B) Pearl-Verhulst
(C) Gause
(D) Darwin.


(D) Darwin.


Q11. What parameters are used for tiger census in our country’s national parks and sanctuaries?

(A) Pugmarks only
(B) Pug marks and faecal pellets
(C) Faecal pellets only
(D) Actual head counts.


(B) Pug marks and faecal pellets


Q12. When the number of immigration and births is more than emigration and deaths, the growth curve of the population will show

(A) Declining phase
(B) Steady phase
(C) Exponential phase
(D) Lag phase


(C) Exponential phase


Q13. The number of births in polygamous population is often directly related to :

(A) number of males
(B) number of females
(C) both (A) and (B)
(D) none of these


(B) number of females


Q14. Ecological niche is:

(A) the surface area of the ocean
(B) a an ecologically adapted zone
(C) the physical position and functional role of a species within the community
(D) formed of all plants and animals living at the bottom of a lake.


(C) the physical position and functional role of a species within the community


Q15. Several plant and animal species present together at a place constitute a

(A) genus
(B) population
(C) biome
(D) community.


(D) community.


Q16. Mycorrhiza is an example of

(A) ectoparasitism
(B) mutualism
(C) endoparasitism
(D) predation


(B) mutualism


Q17. Niche overlap indicates

(A) mutualism between two species
(B) active cooperation between two species
(C) sharing of one or more resources between the two species
(D) two different parasites on the same host.


(C) sharing of one or more resources between the two species


Q18. Which of the following is not an example of preypredator relationship ?

(A) Tiger eating a deer
(B) Plant Nepenthes trapping an insect
(C) Bacteria decomposing organic matter
(D) Crocodile killing a man


(C) Bacteria decomposing organic matter


Q19. 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.


(C) It will increase.


Q20. Biotic components of the ecosystem :

(A) Share and compete for resources
(B) Only compete for resources
(C) Only share their resources
(D) Neither share nor compete for resources


(A) Share and compete for resources


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