Waec Agricultural Science 2018 Past Questions and Answers

Question 26:

• WAEC 2018

Assuming that brown colour is dominant over black colour in cowpea, what percentage of the F1 will have brown colour , if a homozygous brown cowpea is crossed with a homozygous black cowpea?

A. 100%
B. 75%
C. 50%
D. 25%

Question 27:

• WAEC 2018

Ornamental plants are commonly used for the following purposes except

A. For exterior decorations
B. As sources of perfumes
C. Provision of shade
D. As bedding materials for animals

Question 28:

• WAEC 2018

Hibiscus and croton are examples of

A. Ground covers
B. Hedge plants
C. Lawn plants
D. Avenue trees

Question 29:

• WAEC 2018

A disadvantage of vegetative propagation is that

A. Plants are true to type
B. Fruits are small in size
C. Plants take a long time to mature
D. Diseases are easily transferred to offspring

Question 30:

• WAEC 2018

An effective method of preventing viral diseases in crops is by

A. Treating the seeds with fungicides
B. Practicing crop rotation
C. Regular spraying of crops
D. Planting resistant varieties