Life Sciences
GATE XL Microbial Ecology PYQs
Build your understanding with focused practice from past exam papers.
How to practice Microbial Ecology
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–7 of 7. Imported answers require independent review unless marked reviewed.
Question 73
Open questionXL-SMCQ1 markNeeds review
Which one of the following represents the abundance of the organisms found in soil?
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 80
Open questionXL-SMSQ2 marksNeeds review
At root nodules, which of the following C4 organic acid(s) is/are transported across the symbiosome membrane and into bacteroids?
Your answerSelect all correct options. You can choose more than one.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 67
Open questionXL-SMCQ1 markNeeds review
Which one of the following converts sulfate to hydrogen sulfide?
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 5
Open questionXL-SMCQ1 markNeeds review
Protists belonging to the genus Trichonympha thrive in the gut of termites. They help the termites use wood as a food source. This relationship is an example of
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 12
Open questionXL-SMCQ2 marksNeeds review
Match the process involved in nitrogen or sulfur cycle in Group I with the corresponding microbe in Group II.
Group I
P. Denitrification
Q. Nitrogen fixation by free-living microbe
R. Oxidation of H₂S to sulfur
S. Nitrogen fixation by a symbiotic microbe
Group II
Azotobacter
Beggiatoa
Pseudomonas
Rhizobium
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 8
Open questionXL-SMCQ1 markNeeds review
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?
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 73
Open questionXL-SNAT2 marksNeeds review
Assume that the average DNA content of a single microbial cell is 4 femtogram. A soil sample analyzed for its microbial community DNA is found to contain 0.32 μg DNA per gram of the soil. The number of microbial cells per milligram of the soil are ______.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer