Populations — NEET Biology Questions

Practice 137 questions on Populations from Organisms and populations (NCERT Class 12, Chapter 11). Free samples below — get all 137 in the app.

137 Questions Organisms and populations Class 12

Sample Questions — Populations

Try 5 questions below from Populations. Get all 137 in the MedicNEET app.

MCQ
In the equation dN/dt = rN, what does 'r' represent?
  • A. Intrinsic rate of natural increase
  • B. Reproductive value
  • C. Relative mortality
  • D. Exponential constant
✅ Correct Answer: A
'r' is the per capita growth rate and indicates the potential growth capacity of a population.
MCQ
Which of the following is not a possible interaction between two species?
  • A. Both benefit
  • B. Both are harmed
  • C. One benefits, one harmed
  • D. Both remain completely unaffected
✅ Correct Answer: D
In nature, most species interact. The main types include mutualism, competition, parasitism, etc. Complete non-interaction is rare.
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MCQ
In a logistic growth curve (sigmoid), the inflection point represents:
  • A. Where population density starts to decline
  • B. Where population is zero
  • C. Where growth rate is maximum
  • D. Where birth equals death
✅ Correct Answer: C
In logistic growth, the inflection point marks the fastest growth before the effects of environmental resistance set in.
MCQ
Which of the following is a case where number is not a good measure of population size?
  • A. Number of lotus in a pond
  • B. Number of rats in a lab
  • C. One huge banyan tree and 200 carrot grass
  • D. Number of fruit flies per cage
✅ Correct Answer: C
In such cases, percent cover or biomass is more meaningful than mere number.
MCQ
Which statements about parasites and hosts are correct? I. Most parasites are host-specific. II. Parasites usually have simplified anatomical features. III. Parasites increase the growth rate of the host. IV. Parasites often involve multiple intermediate hosts
  • A. I and II only
  • B. I, II, and IV only
  • C. I, III, and IV only
  • D. II and III only
✅ Correct Answer: B
I – True: Parasites tend to co-evolve with specific hosts. II – True: Due to reliance on hosts, they lose unnecessary organs. III – False: They harm growth, reproduction, and survival. IV – True: Many have complex life cycles (e.g., liver fluke).

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