Organisms and Populations is a Class 12 Biology chapter that carries about 2.8% of the Biology questions in NEET. Practise it with 52 questions covering 4 topics, each with an explanation.
Sets of 15 questions that adapt to your level, with an explanation for every answer.
Across the 13 previous year papers, Organisms and Populations had 34 questions, about 2.6 a year. The most in one paper was 5, in NEET 2018.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 3 |
| NEET 2025 | 3 |
| NEET 2024 | 2 |
| NEET 2023 | 4 |
| NEET 2022 | 3 |
| NEET 2021 | 4 |
| NEET 2020 | 1 |
| NEET 2019 | 0 |
| NEET 2018 | 5 |
| NEET 2017 | 3 |
| NEET 2016 | 3 |
| Re-AIPMT 2015 | 2 |
| AIPMT 2014 | 1 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
The desert plant Opuntia has its leaves reduced to spines, and the photosynthesis is carried out by:
Answer: D. the flattened stem
Why: It also has a thick cuticle and sunken stomata.
In a pond, there were 50 frogs last year, and 5 new frogs were born during the year. The birth rate per capita is:
Answer: A. 0.1 per frog per year
Why: Natality = 5/50.
In the logistic model of population growth, the growth rate approaches zero as the population size approaches:
Answer: B. the carrying capacity (K)
Why: The logistic equation incorporates a term that drives growth rate to zero as population size N approaches the carrying capacity K, reflecting resource limitation.
A cuckoo laying its eggs in the nest of a crow, which then incubates them, is an example of:
Answer: B. brood parasitism
Why: The eggs of the parasite resemble the host's eggs to avoid detection.
Organisms that maintain a constant internal environment despite external changes are called:
Answer: B. regulators
Why: Birds and mammals are regulators; most other animals and plants are conformers.
Population density is defined as the number of individuals of a species per:
Answer: B. unit area or volume
Why: Population density refers to the number of individuals of a species present per unit area (for terrestrial populations) or unit volume (for aquatic populations).
The interaction between the clown fish and the sea anemone, in which the fish gets protection but the anemone is not harmed, is:
Answer: D. commensalism
Why: Cattle egrets and cattle also show this.
The seals of the polar seas have a thick layer of fat below the skin called:
Answer: B. blubber, which reduces the loss of body heat
Why: It is an adaptation to a cold environment.
Organisms and Populations carries about 2.8% of the Biology questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 34 times, about 2.6 questions a year.
Organisms and Populations is a Class 12 Biology chapter in the NCERT syllabus.
NeetVictory has 52 practice questions on Organisms and Populations, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
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