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Botany - Ecosystem

Practise 23 AIIMS previous year questions on Ecosystem, compiled from papers spanning 2003 to 2018. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Ecosystem has been asked in 11 of the 19 years of AIIMS papers analysed (2001–2019), with 23 questions in all. 35% of them were easy, 43% moderate and 22% tough. Most of its questions came from 2003, with 5 questions that year. In the last three years (2017–2019) it had 1 question across 5 papers, about 0.2 per paper.

The chapter's 8 topics are not weighted equally: Functions of Ecosystem (5 questions, 22%), Ecological Succession (4 questions, 17%), and Structure of Ecosystem (3 questions, 13%) have been asked the most. Functions of Ecosystem has produced the most tough questions (1).

  1. 1Assertion : Net primary productivity is gross primary productivity minus respiration. Reason : Secondary productivity is produced by heterot27 May, 2018Functions of Ecosystem
  2. 2Most animals that live in deep oceanic waters are2016Components of Ecosystem
  3. 3Assertion : Rice field is an ecosystem for plants and animals. Reason : Gut of human/animals is an ecosystem for flora and fauna.2013Components of Ecosystem
  4. 4Assertion : In a terrestrial ecosystem, detritus food chain is the major conduit for energy flow. Reason : Solar energy is the direct source2012Functions of Ecosystem
  5. 5What is the Greek word for ecology?2010Introduction
  6. 6Animals take phosphorus from2010Cycles Operating
  7. 7Assertion : Secondary succession takes place in recently denuded area. Reason : It is caused due to baring of an area.2009Ecological Succession
  8. 8The bacteria which attack dead animals are2008Structure of Ecosystem
  9. 9Assertion : The plant biomass which serves as the food of herbivores and decomposers is said to result from the gross primary productivity. 2008Functions of Ecosystem
  10. 10Beta diversity is diversity2007Ecosystem Services
  11. 11Ozone in stratosphere extends2007Cycles Operating
  12. 12Assertion : Plants absorb sulphur in the form of sulphate ions. Reason : Sulphur bacteria are required for the formation of sulphate.2007Ecological Succession
  13. 13Assertion : Deforestation is one main factor contributing to global warming. Reason : Besides , two other gases methane and CFCs are also in2006On the Basis Development
  14. 14Assertion : UV radiation causes photodissociation of ozone into and , thus causing damage to the stratospheric ozone layer. Reason : Ozone h2006Components of Ecosystem
  15. 15Assertion : In tropical rain forests, O-horizon and A-horizon of soil profile are shallow and nutrient-poor. Reason : Excessive growth of mi2006Ecological Succession
  16. 16Which one of the following correctly represents an organism and its ecological niche?2005Functions of Ecosystem
  17. 17Given below is one of the types of ecological pyramids. This type represents2005Functions of Ecosystem
  18. 18Which one of the following is correct matching of a plant, its habit and the forest type where it normally occurs?2005On the Basis Development
  19. 19Which one of the following pairs of terms / names mean one and the same thing?2003Structure of Ecosystem
  20. 20is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying2003Structure of Ecosystem
  21. 21Assertion : All birds, except the ones like koel (cuckoo) build nests for retiring and taking rest during night time (day time for nocutrnal2003Ecological Succession
  22. 22Assertion : In a food chain members of successive higher levels are fewer in number. Reason : Number of organisms at any trophic level depen2003On the Basis Development
  23. 23Assertion : Leaf butterfly and stick insect show mimicry to dodge their enemies. Reason : Mimicry is a method to acquire body colour blendin2003Introduction

Frequently Asked Questions

1.How many questions are available for Ecosystem?

This chapter includes 23 questions compiled from AIIMS papers spanning 2003 to 2018.

2.Are these questions only from AIIMS, or from other exams too?

These are AIIMS questions specifically for the Ecosystem chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

3.Is Ecosystem an important chapter for AIIMS Botany?

Ecosystem has appeared in 11 of the 19 years of AIIMS papers covered here, with 23 questions across 11 papers - about 2 per paper it appears in.

4.What is the difficulty level of Ecosystem questions in AIIMS?

Of the 23 questions analysed for this chapter, 35% are easy, 43% moderate and 22% tough. 2003 had the most, with 5 questions.

5.Which topics in Ecosystem should I focus on?

These topics have carried the most weightage in Ecosystem:

  • Functions of Ecosystem - 5 questions (22%)
  • Ecological Succession - 4 questions (17%)
  • Structure of Ecosystem - 3 questions (13%)
  • Functions of Ecosystem has produced the most tough questions (1).
6.Is Ecosystem's weightage in AIIMS going up or down?

Across all 11 papers analysed, Ecosystem has averaged about 2.1 questions per paper. In the last three years (2017–2019), that average has fallen, at about 0.2 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.