Jamb Biology 1980 Past Questions and Answers

Question 36:

• JAMB 1980

If a baby is a female, her mother's ovum must have been fertilized by a sperm carry the chromosome

A. X
B. XY
C. XX
D. YY
E. Y

Question 37:

• 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 38:

• 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 39:

• 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 40:

• JAMB 1980

Oxygen from the atmosphere reaches the mammalian blood stream through one of the path indicated below. Indicate the correct path, a = mouth, b = trachea, c = bronchiole, d = nostril, e = bronchus, f = alveoli

A. A → b → e → f → d
B. B → d → f → e → c
C. D → b → e → c → f
D. B → a → f → e → c
E. F → e → c → d → c