Ecology - Biology Jamb Past Questions and Answers

Question 51 :

• JAMB 1984

If a handful of soil is shaken with water and left to settle, the soil particles will settle from light to heavy particles as follows

A. Humus, clay, silt, sand, stones
B. Humus, silt, clay, sand, stones
C. Humus, clay,silt, stones, sand
D. Humus, sand, silt, clay, stones
E. Clay, humus, silt, sand, stones

Question 52 :

• JAMB 1984

Denitrifying bacteria in nature liberate gaseous nitrogen directly from

A. Ammonium salts
B. Soil nitrates
C. Thunderstorms
D. Soil nitrites
E. Plant and animal proteins

Question 53 :

• JAMB 1984

Leaching is

A. Washing away of humus from the soil surface
B. Reducing of soil aeration by pressure
C. Soil erosion by means other than rainfall
D. Loss of organic matter due to exposure to direct sunlight
E. Washing out chalk and limestone from upper layers of by heavy rains

Question 54 :

• JAMB 1984

The process of soil erosion is usually from

A. Rill → sheet → gully
B. Gully → rill → sheet
C. Sheet → guly → rill
D. Sheet → rill → gully
E. Rill → gully → sheet

Question 55 :

• JAMB 1985

A relationship between living organisms which is of mutual benefit is

A. Parasitism
B. Saprophtism
C. Ecosystem
D. Symbiosis
E. Commensalism