226
MCQ Questions
40
Assertion-Reason
49
NEET 2025 Pattern
37
Previous Year Q
NCERT Mapping
Organisms and populations is from NCERT Class 12 Biology, Chapter 11, under the unit Ecology. This chapter carries approximately 3% weightage in NEET, based on analysis of the last 10 years of question papers. MedicNEET covers this chapter with 315 questions — every question built from line-by-line NCERT analysis.
Topics in Organisms and populations
Sample Questions — Organisms and populations
Try 5 free questions below. Get all 315 in the MedicNEET app.
MCQ
In which interaction do both species benefit?
✅ Correct Answer: D
In mutualism, both species involved derive benefit from the interaction.
MCQ
Which of the following are correct?
1. Net primary productivity of ecosystems supports herbivores and decomposers.
2. Loss of biodiversity leads to increased variability in ecosystem processes like plant productivity and pest cycles.
3. Population interactions such as predation help in transferring energy to higher trophic levels.
4. Sacred groves are examples of ex situ conservation of biodiversity.
5. Logistic growth model realistically represents population growth in resource-limited environments.
✅ Correct Answer: C
NPP is available biomass. Biodiversity loss destabilises functions. Predation moves energy upward. Sacred groves = in situ. Logistic model fits finite resources.
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MCQ
What is the carrying capacity (K) of a habitat?
✅ Correct Answer: B
Carrying capacity is the upper limit of population a habitat can support with available resources.
Assertion-Reason
Assertion (A): Different types of species interactions have different outcomes for the participating species.
Reason (R): In mutualism both species lose while in competition both species benefit from their interactions.
✅ Correct Answer: C
The Assertion is true - different interactions have different outcomes. However, the Reason is false. NCERT states “Both the species benefit in mutualism and both lose in competition in their interactions with each other” - the Reason reverses the outcomes.
NEET 2025 Pattern
Which of the following statements regarding factors regulating population density are NOT correct?
S1: The intensity of predation typically increases with an increase in prey population density, making it a density-dependent factor.
S2: Competition for resources, particularly when limiting, acts as a density-independent factor because its effects are constant irrespective of population size.
S3: Catastrophic natural calamities like droughts and severe storms are considered density-independent factors as their impact on mortality is largely unaffected by population density.
S4: The effect of parasitism on a host population tends to be more pronounced at higher host densities, thereby classifying it as a density-dependent factor.
S5: Disease transmission rates and subsequent mortality are generally independent of population density, affecting populations uniformly.
✅ Correct Answer: B
The core concept tested here is the distinction between density-dependent and density-independent factors influencing population regulation.
S1 is correct. Predation pressure is generally density-dependent; as prey density increases, it becomes easier for predators to find and consume prey, increasing the impact of predation. The NCERT discusses predation as a factor influencing population density.
S2 is NOT correct. Competition for resources is a classic example of a density-dependent factor. Its effects (reduced fitness, survival) intensify as population density increases because resources become scarcer per individual. The statement incorrectly classifies it as density-independent.
S3 is correct. Adverse weather conditions (like drought) or natural calamities are density-independent factors because their impact on a population's mortality or birth rates is largely unrelated to the population's density. The NCERT mentions "adverse weather" as a factor influencing population size, which typically refers to density-independent effects.
S4 is correct. Parasitism is a density-dependent factor. As host population density increases, parasites can spread more easily and efficiently, leading to a greater impact on the host population. The NCERT describes how parasites reduce survival, growth, and reproduction of the host, affecting population density.
S5 is NOT correct. Disease transmission and its impact are generally density-dependent. In denser populations, pathogens can spread more rapidly and effectively due to increased contact between individuals, leading to higher rates of infection and mortality. The statement incorrectly classifies it as density-independent.
Therefore, statements S2 and S5 are NOT correct.
The correct option is B because it accurately identifies the two incorrect statements.
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Frequently Asked Questions
How many Organisms and populations questions does MedicNEET have?
MedicNEET has 315 questions for Organisms and populations, including 226 MCQs, 40 Assertion-Reason questions, and 49 NEET 2025-style long-form questions.
What is the NEET weightage of Organisms and populations?
Organisms and populations carries approximately 3% weightage in NEET, based on analysis of the last 10 years of papers. It falls under the Ecology unit of Class 12 Biology.
Are Organisms and populations questions NCERT-based?
Yes, all MedicNEET Organisms and populations questions are built from line-by-line analysis of NCERT Class 12 textbook. Every question maps to specific NCERT pages and concepts.