Jamb Agricultural Science 2021 Past Questions and Answers

Question 31:

• JAMB 2021

Root-knot disease of tomato is caused by

A. Virus
B. Nematode
C. Bacterium
D. Fungus

Question 32:

• JAMB 2021

Callosobruchus maculates is a common pest of

A. Maize
B. Cowpea
C. Rice
D. Millet

Question 33:

• JAMB 2021

Gummosis disease of citrus is caused by

A. Aphids
B. Fungi
C. White flies
D. Bacteria

Question 34:

• JAMB 2021

Which of the weeds is dispersed by wind?

A. Pig weed (Boerhavia diffusa)
B. Goat weed (Ageratum conizoides)
C. Hause thorns (Acanthospermum hispidum)
D. Tridax (Tridax procumbeus)

Question 35:

• JAMB 2021

The characteristic symptoms of mosaic disease of crops is usually observed on

A. Roots
B. Leaves
C. Stems
D. Fruits