Question 631:

• JAMB 1989

A physiological adaptation of plants to the problem of excessive water loss is

A. Reduction in the number of stomata
B. Reversal of the normal stomatal rythm
C. Possession of shallow roots
D. Ppossession of waxy curticle

Question 632:

• JAMB 1989

which of the ways of controlling bilharzia can result in pollution?

A. Clearing water weeds on which the snail feed
B. Treating infected people with drugs
C. Preventing contamination of water by infected urine and faeces
D. Applying chemical to kill the snails

Question 633:

• JAMB 1989

which of the following disease can be caused by a bacterium?

A. Ringworm
B. Poliomyelitis
C. Malaria
D. Syphilis

Question 634:

• JAMB 1989

Which of the following is a dangerous product of coal burning?

A. Sulphur dioxide
B. Carbon dioxide
C. Carbon
D. Nitrogen

Question 635:

• JAMB 1989

5 g of oven dried soil was heated in a furnace for 24 hours. After cooling, it weighed 4.8 g. What is the amount of humus in the soil?

A. 40.0g per 100 g dry soil
B. 4.4g per 100g dry soil
C. 4.0 g per 100g dry soil
D. 0.4g per 100g dry soil