Waec Agricultural Science 1998 Past Questions and Answers

Question 31:

• WAEC 1998

The physiological changes that show up during disease attack on crop plants are referred to as

A. Signs
B. Symptoms
C. Necrosis
D. Deformations
E. Abnoemalities

Question 32:

• WAEC 1998

The major pest of maize in Southern Nigeria is called

A. Budworm
B. Stem borer
C. Leaf worm
D. Aphid
E. Mealy bug

Question 33:

• WAEC 1998

Which of the following insect pests of crops is usually controlled by fumigation?

A. Bean weevil
B. Capsid bug
C. Cotton stainer
D. Grasshopper
E. Yam beetle

Question 34:

• WAEC 1998

A major symptom f onion/twister is

A. Appearance of dark brown spots on leaves
B. Motting of leaves
C. Rottening of roots
D. Rottening of bulds
E. Premature drying of leaves

Question 35:

• WAEC 1998

Gummosis is caused by a

A. Fungus
B. Virus
C. Bacterium
D. Nematoad
E. Protozoan