NEET · Biology —

Organisms and Populations appeared 3 times across 1 year — 3.3% of Biology. This question is from Population Growth Models.

Year 2024 Total
Questions 3 3
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Which of the following equations depicts Verhulst-Pearl logistic population growth?

Solution & Explanation

Related Formula
(dN)/(dt) = rN((K - N)/(K))

where K = Carrying capacity, r = Intrinsic rate of natural increase, N = Population density at time 't'.

Core Logic

The Verhulst-Pearl logistic growth model accounts for environmental resistance, where growth slows down as population size (N) approaches carrying capacity (K). This limitation is represented by the factor (K-N)/(K).

Pattern Recognition

Logistic growth must have the (K-N)/K dampening factor which makes the rate approach zero when N = K.

Chapter Mix

Class 12 Biology: Organisms and Populations

Reference Study Guides

Organisms And Populations

More Organisms and Populations Previous-Year Questions

Q139 neet_2026_03_may_morning Population Interactions
Which one of the following is an appropriate example of sexual deceit?
  • A. Female wasp and fig
  • B. Cuckoo and crow
  • C. Ophrys and bumblebee
  • D. Sea anemone and clown fish

Solution

Core Logic

Let's analyze the ecological interactions:

  • Female wasp and fig: Mutualism (pollination in exchange for oviposition sites).
  • Cuckoo and crow: Brood parasitism (cuckoo lays eggs in crow's nest).
  • Sea anemone and clown fish: Commensalism (fish gets protection, anemone unaffected).
  • Ophrys (Mediterranean orchid) and bumblebee: The orchid employs 'sexual deceit'. One petal of its flower bears an uncanny resemblance to the female of the bee species in size, colour, and markings. The male bee 'pseudocopulates' with the flower, transferring pollen.
Step 1: Final Conclusion

Ophrys and bumblebee is the textbook example of sexual deceit.

Pattern Recognition

Sexual deceit is uniquely tied to the Mediterranean orchid Ophrys tricking male bees.

Chapter Mix

Class 12 Biology: Organisms and Populations

Q180 neet_2026_03_may_morning Population Interactions
Choose the correct statements regarding population interactions between two species. A. In both parasitism and commensalism, only one species benefits and the other species is harmed. B. Both species benefit in mutualism. C. Both species benefit in commensalism. D. In parasitism, only one species benefits and the other species is harmed. E. In amensalism, one species is harmed and the other is unaffected. Choose the correct answer from the options given below:
  • A. A and D only
  • B. A and B only
  • C. B and E only
  • D. B, D and E only

Solution

Core Logic

In mutualism, both species benefit (+, +). In parasitism, one species is benefitted and the other is harmed (+, -). In commensalism, one species gets benefitted and the other remains unaffected (+, 0). In amensalism, one species is harmed and the other is unaffected (-, 0).

Therefore, statements B, D, and E are correct.

Population Interactions table for Q180 - NEET 2024 Morning
Population Interactions table for Q180 - NEET 2024 Morning

Pattern Recognition

Mutualism = +,+ Commensalism = +,0 Amensalism = -,0 Parasitism = +,-

Chapter Mix

Class 12 Biology: Organisms and Populations

More Organisms and Populations Questions — neet_2026_03_may_morning

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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)