Jamb Biology Past Questions and Answers

Question 836:

• JAMB 1993

What ecological condition favours the breeding of black flies?

A. Fresh water habitat
B. Water in ponds and swamp
C. Water in small containers
D. Fast flowing streams

Question 837:

• JAMB 1993

Carbon monoxide poisons tissue by

A. Constricting the blood vessels
B. Killing the cells
C. Combining with haemoglobin
D. Rupturing the blood vessels

Question 838:

• JAMB 1993

Which of the following is an example of discontinuous variation observed in man?

A. Skin colours
B. Tongue rolling
C. Body weight
D. Height

Question 839:

• JAMB 1993

During blood transfusion, agglutination may occur when

A. Contrasting antigens reacts with contrasting antibodies
B. Similar antigens react with similar antibodies
C. Two different antigens react with each other
D. Two different antibodies react with each other

Question 840:

• JAMB 1993

In the illustration above, the genotypes of the offsprings are

A. 1 heterozygous smooth : 2 homozygous smooth : 1 wrinkled
B. 1 homozygous smooth : 2 heterozygous smooth : 1 wrinkled
C. 2 homozygous smooth : 2 wrinkled
D. 3 heterozygous smooth : 2 wrinkled