Which of the following will not be a reason for afforestation?

A. population pressure

B. soil fertility conservation

C. wildlife conservation

D. prevention of natural hazard

Mosaic disease affects

A. cotton and cocoa

B. groundnut and tomato

C. cassava and tobacco

D. mango and orange

Which of the following is a symptom of black-pod disease of cacao?

A. diseases leaves fall prematurely

B. characteristic swellings appear on young stems and roots

C. small brown spot first appears on the pod

D. veins of diseased leaves become red in colour

Which of the following insect groups readily attacks dry grains?

A. boring insects

B. biting insects

C. sucking insects

D. piercing insects

Rosette disease of groundnut is transmitted by

A. an eelworm

B. a grasshopper

C. a whitefly

D. an aphid

The control of spear grass on the farm is difficult because

A. it produces a large quantity of seeds

B. it is easily propagated by suckers

C. it has a very persistent rhizome

D. seeds presist in the soil for a long time

The use of fungal pathogens to control dodder weed is a

A. physical method

B. mechanical method

C. biological method

D. cultural method

Hybrid vigour in crop improvement is brought about through

A. intorduction

B. mass selection

C. inbreeding

D. cross breeding

Which of the following structures is not a part of the digestive tract of pigs?

A. oesophagus

B. proventriculus

C. duodenum

D. colon

The urethra in the male animal is described as a urinogenital duct because it

A. opens to the outside through the penis

B. is attached to the accessory sex glands

C. is a common pathway for urine and sperms

D. is the site for the storage of sperms