In This Post we are  providing Chapter-13 Organisms and Population  NCERT MCQ for Class 12 Biology which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON ORGANISMS AND POPULATION

Question 1.
The shifting of an organism temporarily from the stressful habitat to a more hospitable area and return when stressful period is over is called
(a) Suspend
(b) Migrate
(c) Hibernation
(d) Aestivation

Answer: (b) Migrate

Question 2.
Winter sleep is also called as
(a) Hibernation
(b) Suspend
(c) Migrate
(d) Aestivation

Answer: (a) Hibernation

Question 3.
To avoid summer-related problems – heat and desiccation by organism is called
(a) Hibernation
(b) Suspend
(c) Migrate
(d) Aestivation

Answer: (d) Aestivation

Question 4.
A stage of suspended development is called
(a) Diapause
(b) Suspend
(c) Migrate
(d) Aestivation

Answer: (a) Diapause

Question 5.
Both the species benefit in
(a) Parasitism
(b) Mutualism
(c) Competition
(d) Predation

Answer: (b) Mutualism

Question 6.
Both species lose in
(a) Mutualism
(b) Competition
(c) Parasitism
(d) Predation

Answer: (b) Competition

Question 7.
One species benefit in
(a) Parasitism
(b) Predation
(c) Mutualism
(d) Both (a) and (b)

Answer: (d) Both (a) and (b)

Question 8.
The interaction where one species is benefitted and the other is neither benefitted nor harmed is called
(a) Commensalism
(b) Amensalism
(c) Mutualism
(d) None of the above

Answer: (a) Commensalism

Question 9.
If one species is harmed whereas the other is unaffected is called
(a) Commensalism
(b) Amensalism
(c) Mutualism
(d) None of the above

Answer: (a) Commensalism

Question 10.
Parasites that feed on the external surface of the host organism are called
(a) Ecto parasites
(b) Endo parasites
(c) Brood parasitism
(d) None of the above

Answer: (a) Ecto parasites

Question 11.
Parasites that live inside the host body at different sites are called
(a) Ecto parasites
(b) Endo parasites
(c) Brood parasitism
(d) None of the above

Answer: (b) Endo parasites

Question 12.
The number of birth during a given period in the population that are added to the initial density is referred to
(a) Natality
(b) Mortality
(c) Sex-ratio
(d) None of the above

Answer: (a) Natality

Question 13.
The number of deaths in the population during a given period is referred to
(a) Natality
(b) Mortality
(c) Sex-ratio
(d) None of the above

Answer: (b) Mortality

Question 14.
The size of the population tells us a lot about its status in the
(a) Environment
(b) Sex-ratio
(c) Age pyramid
(d) Habitat

Answer: (d) Habitat

Question 15.
For human population, the age pyramids generally show age distribution of
(a) Only males
(b) Only females
(c) Of males and females
(d) None of the above

Answer: (c) Of males and females

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