Jamb Biology 1983 Past Questions and Answers

Question 16:

• JAMB 1983

28 g soil sample was heated to a constant weight of 24 g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil?

A. 22.2
B. 55.6
C. 75.0
D. 25.0
E. 35.7

Question 17:

• JAMB 1983

Which of the following diseases is NOT caused by a virus?

A. Rinderpest
B. Maize rust
C. Newcastle diseases
D. Swine fever
E. Cassava mosaic diseases

Question 18:

• JAMB 1983

A centipede differs from a millipede by its

A. Colour
B. Numerous abdominal segment
C. Paired legs on each abdominal segment
D. Poison claws
E. Cylindrical body

Question 19:

• JAMB 1983

An organism having one pair of identical genes is

A. A heterozygote
B. A hybride
C. An allelomorph
D. A homozygote
E. A diploid

Question 20:

• JAMB 1983

Plants which can survive in places where the water supply is limited are

A. Bryophytes
B. Mesophytes
C. Xerophytes
D. Hydrophytes
E. Pteridophytes