Microbiology of Soils problems
- 1. The energy value of biogas is typically
Options- A. 400-700 BTU/ft3
- B. 1,000 BTU/ft3
- C. 1500 BTU/ft3
- D. more than 5000 BTU/ft3 Discuss
Correct Answer: 400-700 BTU/ft3
- 2. Denitrification is
Options- A. reduction of nitrate (NO3-) to nitrogen gas
- B. reduction of nitrate to organic nitrogen compounds
- C. both (a) and (b)
- D. changing of atmospheric nitrogen (N2) to nitrogen compounds Discuss
Correct Answer: both (a) and (b)
- 3. Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?
Options- A. Saccharomyces cerevisiae
- B. VA Mycorrhiza
- C. Candida torulopsis
- D. Aspergillus niger Discuss
Correct Answer: VA Mycorrhiza
- 4. Nitrogen oxidation (nitrification)refers to the
Options- A. conversion of ammonium ions into nitrates through the activities of certain bacteria.
- B. changing of atmospheric nitrogen (N2) to nitrogen compounds
- C. sulfur is oxidized to the sulfate form through Thiobacillus bacteria
- D. none of the above Discuss
Correct Answer: conversion of ammonium ions into nitrates through the activities of certain bacteria.
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