Microbial Interactions and Biogeochemical Cycles - Microbial Ecology - Life Sciences Previous Year Questions

1

2007 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2007

Complete denitrification of nitrate results in the formation of

A

N₂

B

NH₃

C

N₂O₅

D

NH₂OH

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2

2007 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2007

Match the following product/process to the microorganism involved

Product/Process	Microorganism
(P) Bioplastics	(1) Beauveria bassiana
(Q) Bioremediation	(2) Thiobacillus thiooxidans
(R) Bioleaching	(3) Ralstonia eutropha
(S) Biopesticide	(4) Pseudomonas putida

A

P-3, Q-2, R-4, S-1

B

P-1, Q-2, R-3, S-4

C

P-3, Q-4, R-2, S-1

D

P-1, Q-4, R-2, S-3

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3

2009 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2009

Microorganisms responsible for nitrification

A

Nitrosomonas and Nitrobacter

B

Nostoc and Anabaena

C

Rhizobium and Azotobacter

D

Clostridium and Pseudomonas

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4

2009 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2009

Which one of the following life styles does Rhizobium species adopt to fix molecular nitrogen to ammonia ?

A

Both symbiotic as well as non symbiotic

B

Only symbiotic

C

Only non-symbiotic

D

Only commensalism

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5

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?

A

Pseudomonas and Azotobacter

B

Pseudomonas and Desulfovibrio

C

Azotobacter and Thiobacillus

D

Nitrosomonas and Nitrobacter

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6

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?

A

Frankia

B

Clostridium

C

Rhodospirillum

D

Rhizobium

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7

2012 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2012

Which one of the following pairs of bacterial species fixes atmospheric Nitrogen?

A

Clostridia and Rhizobia

B

Clostridia and Lactobacillus

C

Rhizobia and Enterococcus

D

Actinomycetes and Mycoplasma

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8

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

A

Clostridium botulinum

B

Bacillus subtilis

C

Escherichia coli

D

Clostridium tetani

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9

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?

A

Propionibacterium acnes

B

Lactobacillus casei

C

Streptococcus suis

D

Bacteroides fragilis

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10

2019 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2019

Which of the following is a symbiotic bacterial genus that converts nitrogen into nitrogen containing compounds that are utilized by legume plants to synthesize amino acids?

A

Spirillum

B

Azotobacter

C

Rhizobium

D

Clostridium

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11

2020 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2020

Match the process involved in nitrogen or sulfur cycle in Group I with the corresponding microbe in Group II.
Group I      Group II
P. Denitrification      1. Azotobacter
Q. Nitrogen fixation by free-living microbe      2. Beggiatoa
R. Oxidation of H₂S to sulfur      3. Pseudomonas
S. Nitrogen fixation by a symbiotic microbe      4. Rhizobium

A

P-2, Q-3, R-4, S-1

B

P-2, Q-1, R-3, S-4

C

P-3, Q-4, R-1, S-2

D

P-3, Q-1, R-2, S-4

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12

2021 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2021

Water balance in extreme halophiles such as Halobacterium is maintained by cell surface glycoproteins consisting of

A

glycine and lysine.

B

lysine and histidine.

C

glycine.

D

aspartate and glutamate.

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13

2024 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2024

Which one of the following represents the abundance of the organisms found in soil?

A

Fungi > Aerobic bacteria > Anaerobic bacteria

B

Aerobic bacteria > Fungi > Anaerobic bacteria

C

Aerobic bacteria > Anaerobic bacteria > Fungi

D

Anaerobic bacteria > Aerobic bacteria > Fungi

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14

2025 · Life Sciences · Microbial Ecology · Microbial Interactions and Biogeochemical Cycles

Life Sciences (XL) 2025

Which of the following is/are example(s) of animal-microbe mutualism?

A

Human - Mycobacterium tuberculosis

B

Dog - Rabies lyssavirus

C

Human - Lactobacillus plantarum

D

Cow - Ruminococcus albus

Check answer

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