Ecosystems is a Class 12 Biology chapter that carries about 1.8% of the Biology questions in NEET. Practise it with 50 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, Ecosystems had 33 questions, about 2.5 a year. The most in one paper was 5, in NEET 2023.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 3 |
| NEET 2025 | 4 |
| NEET 2024 | 1 |
| NEET 2023 | 5 |
| NEET 2022 | 3 |
| NEET 2021 | 3 |
| NEET 2020 | 2 |
| NEET 2019 | 1 |
| NEET 2018 | 1 |
| NEET 2017 | 1 |
| NEET 2016 | 3 |
| Re-AIPMT 2015 | 3 |
| AIPMT 2014 | 3 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
A pyramid of numbers in a typical grassland ecosystem, starting from producers, is generally:
Answer: B. upright
Why: In a grassland ecosystem, the pyramid of numbers is typically upright, since numerous producers (grasses) support progressively fewer organisms at higher trophic levels.
The succession in a newly created pond starts with the:
Answer: B. phytoplankton
Why: It is followed by free-floating angiosperms, the rooted-submerged, rooted-floating and so on.
According to the ten percent law of energy transfer, if producers fix 10,000 kcal of energy, the energy available to primary carnivores (second trophic level of consumers) is approximately:
Answer: B. 100 kcal
Why: Only about 10% of energy is transferred at each trophic level: 10,000 to primary consumers gives 1000 kcal, and a further 10% transfer gives 100 kcal to secondary consumers.
Energy flow in an ecosystem is:
Answer: B. unidirectional, from producers to consumers
Why: Energy flows unidirectionally through an ecosystem, from producers to successive levels of consumers, following the laws of thermodynamics (unlike nutrients, which cycle).
In a nutrient cycle such as the carbon cycle, matter is:
Answer: C. recycled repeatedly between the biotic and abiotic components
Why: Unlike energy, which flows unidirectionally, nutrients like carbon are cycled repeatedly between living organisms and the non-living environment (atmosphere, soil, water).
The pioneer species on a bare rock in the primary succession are:
Answer: A. lichens
Why: They secrete acids that dissolve the rock and help in soil formation.
A food chain that begins with dead organic matter is called a:
Answer: A. detritus food chain
Why: Detritivores and decomposers feed on the detritus, which is the major conduit of energy flow in terrestrial ecosystems.
The rate of decomposition is slowed down by:
Answer: D. low temperature and anaerobiosis
Why: Warm and moist environments favour decomposition.
Ecosystems carries about 1.8% of the Biology questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 33 times, about 2.5 questions a year.
Ecosystems is a Class 12 Biology chapter in the NCERT syllabus.
NeetVictory has 50 practice questions on Ecosystems, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
NeetVictory