Waec Biology 1990 Past Questions and Answers

Question 51:

• WAEC 1990

Water rises most rapidly in

A. Sandy soil
B. Clayey soil
C. Sandy-loam soil
D. Loamy soil
E. Humus soil

Question 52:

• WAEC 1990

Thrombocytes are blood cells responsible for initiating

A. Phagocytosis of bacteria
B. Synthesis of ribosomes
C. Clotting of the blood
D. Immunity to certain infectious diseases
E. Removal of carbondioxide from tissues.

Question 53:

• WAEC 1990

When gametes from pure breeding parents with contrasting features such as tallness and shortness are
involved in monohybrid cross, the offspring in the first filial generation are usually

A. Pure breed
B. Heterozygous dominant
C. Homozygous recessive
D. Mutants
E. Co-dominant

Question 54:

• WAEC 1990

A pair of genes which controls a trait is described as

A. Dominant
B. Recessive
C. Allele
D. Variant
E. Hybrid

Question 55:

• WAEC 1990

The genetic make-up of an organism is described as its

A. Phenotype
B. Genotype
C. Character
D. Chromosome
E. Allele