Biology - Ecosystem
Practise 14 NEST (NISER) previous year questions on Ecosystem, compiled from papers spanning 2016 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty NEST (NISER) tests.
Ecosystem has been asked in 9 of the 16 years of NEST (NISER) papers analysed (2011–2026), with 14 questions in all. 0% of them were easy, 100% moderate and 0% tough. Most of its questions came from 2026, with 2 questions that year. In the last three years (2024–2026) it had 4 questions across 4 papers, about 1 per paper.
The chapter's 5 topics are not weighted equally: Functions of Ecosystem (9 questions, 64%), Components of Ecosystem (2 questions, 14%), and Cycles Operating (1 question, 7%) have been asked the most. Functions of Ecosystem has also led over the last five years, with 5 questions.
- 1There is a difference between the predicted and observed global carbon budget. The possible reason is:2026Functions of Ecosystem
- 2The trophic relationships between species in a habitat can be represented in the form of a food web matrix where, rows represent consumers/p2026Functions of Ecosystem
- 3A researcher wants to study the effect of habitat fragmentation on bird species richness in a tropical rainforest. The species richness of t2025On the Basis Development
- 4The effects of elevated supply, presence of legume and phosphate availability on the above-ground biomass production of a grassland communit2024 (Session 1)Components of Ecosystem
- 5In a closed ecosystem, red algae, crabs and green algae are present and interact with each other. In order to understand the interactions be2023 (Session 1)Components of Ecosystem
- 6Energy diagrams allow ecologists to compare patterns of energy flow through the trophic levels of different ecosystems while biomass diagram2023 (Session 1)Functions of Ecosystem
- 7A histogram of the net primary productivity year ) of selected ecosystems , and is represented below. and most likely represent:2022 (Session 1)Functions of Ecosystem
- 8Four ecological pyramids (I to IV) are shown below. The correct statement(s) about these pyramids is/are:2022 (Session 2)Functions of Ecosystem
- 9The biomass pyramids of three ecosystems are represented below. The ecosystems most likely are:2019 (Session 2)Functions of Ecosystem
- 10A deer with energy reserves of 150 kJ spends 54 kJ in respiration, while 84 kJ is excreted as feces and urine. Based on this information, th2018Functions of Ecosystem
- 11The mean biomass per unit area and the net primary productivity for four ecosystems and are tabulated below. The four ecosystems most likely2017Functions of Ecosystem
- 12In order to estimate the gross primary productivity (GPP) of a pond containing phytoplankton and zooplankton, a student collected water samp2017Functions of Ecosystem
- 13A simplified model of the carbon cycle is depicted below. and Z in the figure could represent2016Cycles Operating
- 14The diagram below shows the relationships among the midge larvae (Chaoborus nyblaei), larval salamander (Ambystoma tigrinum) and two species2016Populations
Frequently Asked Questions
1.How many questions are available for Ecosystem?
This chapter includes 14 questions compiled from NEST (NISER) papers spanning 2016 to 2026.
2.Are these questions only from NEST (NISER), or from other exams too?
These are NEST (NISER) questions specifically for the Ecosystem chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is Ecosystem an important chapter for NEST (NISER) Biology?
Ecosystem has appeared in 9 of the 16 years of NEST (NISER) papers covered here, with 14 questions across 10 papers - about one per paper it appears in.
4.What is the difficulty level of Ecosystem questions in NEST (NISER)?
Of the 14 questions analysed for this chapter, 0% are easy, 100% moderate and 0% tough. 2026 had the most, with 2 questions.
5.Which topics in Ecosystem should I focus on?
These topics have carried the most weightage in Ecosystem:
- Functions of Ecosystem - 9 questions (64%)
- Components of Ecosystem - 2 questions (14%)
- Cycles Operating - 1 question (7%)
6.Is Ecosystem's weightage in NEST (NISER) going up or down?
Across all 10 papers analysed, Ecosystem has averaged about 1.4 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.