SOIL - Jamb Biology Past Questions and Answers

Question 41:

• JAMB 1994

The nitrifying bacteria, Nitrosomonas, convert ammonia to

A. Nitirites
B. Nitric acid
C. Niitrates
D. Nitrous oxide

Question 42:

• JAMB 1996

Nitrifying bacteria keep the soil fertile by

A. Converting nitrate to nitrogen
B. Converting ammonium salt to nitrate
C. Converting atmospheric nitrogen to plant nitrogen
D. Converting nitrate to nitrous oxide
E. Converting atmospheric nitrogen to nitrates

Question 43:

• JAMB 1997

In a soil sample, the relative amouunts of the different soil particles can best be determined by the process of

A. Filtration
B. Centrifugation
C. Precipitation
D. Sedimentation

Question 44:

• JAMB 1998

The condition that encourages denitrification is

A. Low soil oxygen
B. High soil nitrogen
C. Absence of soil bacteria
D. Lightening and thunderstrom

Question 45:

• JAMB 1998

Soil micro-organisms are beneficial because of their involvement in

A. Photosynthesis
B. Translocation
C. Cycling of nutrients
D. Respiration using soil air