Carbon & Sulphur Cycle MCQs : This section focuses on the "Carbon & Sulphur Cycle". These Multiple Choice Questions (MCQs) should be practiced to improve the Carbon & Sulphur Cycle skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Cellulose is degraded to cellobiose by the enzyme __________________
A. cellulase
B. beta-glucosidase
C. hexokinase
D. cellulose dehydrogenase
Question 2
Cysteine breaks down in presence of cysteine desulfurase to give _________________
A. oxaloacetic acid
B. sulphuric acid
C. pyruvic acid
D. glyoxalate
Question 3
Fresh air contains approximately ______ percent carbon dioxide by volume.
A. 0.01
B. 2
C. 5
D. 0.03
Question 4
In carbon cycle flow of energy is _________________
A. bidirectional
B. linear
C. cyclic
D. irreversible
Question 5
Purple and green sulfur bacteria use ___________________ as the electron donor to reduce carbon dioxide.
A. S2-
B. SO42-
C. H2S
D. Organic acids
Question 6
Sulphates are reduced to hydrogen sulphide by _____________________
A. Desulfotomaculum sp.
B. Thiobacillus thiooxidans
C. Photosynthetic sulfur bacteria
D. Rhodospirillum
Question 7
The amount of organic material in the forest soil remains approximately the same from year to year.
A. True
B. False
Question 8
The reduction of sulphates and sulphites to hydrogen sulphide is done by which group of bacteria?
A. aerobic sulfate-reducing bacteria
B. photosynthetic sulphur bacteria
C. anaerobic sulphate-reducing bacteria
D. heterotrophic bacteria
Question 9
The Winogradsky column experiment is done in the dark.
A. True
B. False
Question 10
Which among the following are the most important agents for carbon dioxide fixation?
A. bacteria
B. fungi
C. algae
D. protozoa
Question 11
Which among the following develop in the upper portion of the Winogradsky column?
A. Sulfate-reducing bacteria
B. Green-sulfur bacteria
C. Purple-sulfur bacteria
D. Thiobacilli
Question 12
Which among the following is a non-sulfur purple bacteria?
A. Rhodomicrobium
B. Thiobacillus
C. Chromatium
D. Chlorobium
Question 13
Which of the following processes is performed by Thiobacillus thiooxidans?
A. converting sulphur to sulphates
B. converting sulphur to sulphides
C. converting sulphur to sulphites
D. converting organic sulphur to inorganic sulphur