Root-knot disease in tomatoes is caused by

A. virus

B. nematode

C. bactrium

D. fungus

Callosobruchus maculatus is a common pest of

A. maize

B. cowpea

C. rice

D. millet

Gummosis disease of citrus is caused by

A. aphids

B. fungi

C. white flies

D. bacteria

Which of the following weeds is dispersed by wind?

A. pig weed (boerhavia diffusa)

B. goat weed (ageratum conizoides)

C. hausa throns (acanthospermum hispidum)

D. tridax (tridax procumbens)

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

A. roots

B. leaves

C. stems

D. fruits

The correct sequence in the processes of crop improvement is

A. introduction-slection-breeding

B. breeding-selection-intruduction

C. breeding-introduction-selection

D. introduction-breeding-selection

A condition which a gene does manifest observation characteristics in the presence of its dominant allele is known as

A. dominance

B. mutation

C. recessiveness

D. homozygosity

Gestation period is defined as the time

A. of fusion of the sperm and the egg

B. between conception and parturition

C. of release of ovum from the ovary

D. of the birth of the young animal

The hormone responsible for milk let down in female farm animals is

A. testosterone

B. follicle stimulting hormone

C. oxytocin

D. androgen

The adult male cattle is called

A. bull

B. ram

C. boar

D. buck