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Previous year question hub

Microbial Ecology - Life Sciences Previous Year Questions

Practice Microbial Ecology - Life Sciences previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

11Papers
11Years
14Questions
1Topics

Microbial Ecology question pattern

Every graph below is calculated only from this selection.

Questions by year

Compare question counts across years.

Difficulty distribution

How the classified questions are distributed by difficulty.

Easy 11 78.6%
Medium 3 21.4%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 13 92.9%
MSQ 1 7.1%

Subject weightage

Top subjects by unique question coverage.

Life Sciences
14 Qs

Most asked topics

Top topics across the included previous year papers.

Microbial Ecology
14 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Microbial Interactions and Biogeochemical Cycles
14 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Life Sciences (XL) 2025
1 Qs
Life Sciences (XL) 2024
1 Qs
Life Sciences (XL) 2021
1 Qs
Life Sciences (XL) 2020
1 Qs
Life Sciences (XL) 2019
1 Qs
Life Sciences (XL) 2016
1 Qs
Life Sciences (XL) 2013
1 Qs
Life Sciences (XL) 2012
2 Qs
Life Sciences (XL) 2011
1 Qs
Life Sciences (XL) 2009
2 Qs
Life Sciences (XL) 2007
2 Qs

Browse by subtopics

Open a focused page built from the same verified paper data.

Included previous year papers

Newest papers appear first. Search these papers or sort by year and name.

Paper nameYearPDFAttempt
Life Sciences (XL) 20252025
1 questions in this view
2025
Life Sciences (XL) 20242024
1 questions in this view
2024
Life Sciences (XL) 20212021
1 questions in this view
2021
Life Sciences (XL) 20202020
1 questions in this view
2020
Life Sciences (XL) 20192019
1 questions in this view
2019
Life Sciences (XL) 20162016
1 questions in this view
2016
Life Sciences (XL) 20132013
1 questions in this view
2013
Life Sciences (XL) 20122012
2 questions in this view
2012
Life Sciences (XL) 20112011
1 questions in this view
2011
Life Sciences (XL) 20092009
2 questions in this view
2009
Life Sciences (XL) 20072007
2 questions in this view
2007

Sample previous year questions

A varied preview from the papers represented in this selection, with every available option.

1
2007 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles
Life Sciences (XL) 2007

Complete denitrification of nitrate results in the formation of

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2
2009 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles
Life Sciences (XL) 2009

Microorganisms responsible for nitrification

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3
2011 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles
Life Sciences (XL) 2011

Which of the following are expected to be the abundant inhabitants of a nitrate and sulfate rich soil naturally depleted for oxygen?

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4
2012 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles
Life Sciences (XL) 2012
Which one of the following is a free-living photosynthetic nitrogen fixer?
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5
2013 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles
Life Sciences (XL) 2013
The most common indicator organism of faecal pollution in water is
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6
2016 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles
Life Sciences (XL) 2016

Which one of the following is NOT a part of human microbiome?

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