Jamb Biology 1984 Past Questions and Answers

Question 41:

• JAMB 1984

Which of the following groups of factors is completely abiotic?

A. Salinity, tide, plankton, turbidity
B. Temperaure, pH, soil, insect
C. Wind, altitude, humidity, light
D. Conifers, wind, pH, rainfall
E. Soil, water, bacteria, salinity

Question 42:

• JAMB 1984

Which of the following lists of diseases, their causes and transmission is CORRECT?

A. Cholera, virus, severe diarrhoea, infected water
B. Malaria, protozoan, high fever, contact with infected person
C. Syphilis, virus, veneral disease, sexual intercourse
D. Small pox, virus, skin with blister, close contact with infected person
E. Sleeping sickness, bacteria, tiredness, headache and dozing, tsetsefly bite

Question 43:

• JAMB 1984

Erosion can be reduced along shape by

A. Ridging across slope
B. Ridging up slope
C. Ridging down slope
D. Crop rotation
E. Bush fallowing system

Question 44:

• 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 45:

• 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