Waec Agricultural Science 1989 Past Questions and Answers

Question 31:

• WAEC 1989

The process of meiosis in plants ensures the production of reproduction of reproductive cells with

A. The same number of chromosomes like the parent plant
B. Half the number of chromosomes of the parent plant
C. No chromosomes like the parent plant
D. Thrice the number of chromosomes of the parent plant
E. Twice the number of chromosomes of the parent plant

Question 32:

• WAEC 1989

Why should a seed-producing farmer spray an insecticide on his crops only when the bees are not around?

A. The bees would sting him and he therefore avoids them
B. The farmer does not want to waste his chemicals
C. Bees are important for pollination of his crops
D. Bees produce honey for him in his farm
E. Bees are harmless insects

Question 33:

• WAEC 1989

The average seed rate for maize is 25 kg per hectare. Allowing for a seed wastage of 5 per cent.How many kilogram of seeds would be required in planting 10 hectares of farmland?

A. 237.5
B. 238.0
C. 250.0
D. 255.0
E. 262.5

Question 34:

• WAEC 1989

Thrips cause serious mechanical damages to crops by their

A. Feeding activities on flowers, leaves and fruits
B. Laying eggs on plants
C. Sucking of the sap of crops
D. Burrowing activities causing damping off in crops
E. Activities as vectors of bacterial diseases

Question 35:

• WAEC 1989

The expression of a gene in the phenotype irrespective of whether the cell is homozygous or heterozygous is known as

A. Recessive
B. Partial dominance
C. Test-cross
D. Segregation
E. Dominance