ECOLOGY - Jamb Biology Past Questions and Answers

Question 21:

• JAMB 1980

Leguminous plants, e.g Mucana, are usually planted in cultivated farmlands because they

A. Enrich the soil with phoshates
B. Provide animals with food
C. Enrich the soil with organic nitrogen
D. Protect the soil from being over-heated
E. Protect the micro organisms in the soil

Question 22:

• JAMB 1980

During thunderstorms the energy of lightning discharge causes

A. Oxygen and nitrogen to combine
B. More carbon dioxide to be formed
C. Nitrites to be converted to nitrates
D. Nitrates to be converted to nitrogen
E. Death

Question 23:

• JAMB 1980

A few grams of dried soil were first heated until red hot and then further heated until no more smoke was released. This experiment was to determine

A. Amount of water in soil
B. Percentage of water in soil
C. Presence of humus in soil
D. Resistance of laterities to heat
E. Release of smoke from the soil

Question 24:

• JAMB 1980

Below are some group of diseases. Which group of diseases is caused by bacteria?

A. Tuberculosis, smallpox
B. Gonorrhoea, measles
C. Tuberculosis, polio
D. Sleeping sickness, measles
E. Syphilis, gonorrhoea

Question 25:

• JAMB 1980

A mosquito which produces eggs which float, and whose larvae lie horizontal to the water surface, also rests at the angle on a vertical surface. This type of mosquito is

A. Aedes
B. Anopheles
C. Culex
D. Tiger mosquito
E. None of the above