Jamb Biology 1999 Past Questions and Answers

Question 16:

• JAMB 1999

Mammals acclimatize to reduced oxygen content at high altitudes by

A. The stimulation of marrow to reduce the amount of erythrocytes produced
B. Increasing the rate at which erythrocytes are destroyed
C. The stimulation of marrow to produce more erythrocytes
D. Increasing the break down of the protein portion of the erythrocytes

Question 17:

• JAMB 1999

The modes of nutrition in Nitrobacter, Ascaris and Homo sapiens respectively are

A. Photosynthetic , parasitic and holozoic
B. Chemosynthetic, parasitic and holozoic
C. Photosynthetic, parasitic and heterophytic
D. Chemosynthetic, holophytic and holozoic

Question 18:

• JAMB 1999

The richest source of vitamin A are

A. Palm oil and groundnut oil
B. Palm oil and carrot
C. Rice and groundnut oil
D. Oranges and carrot

Question 19:

• JAMB 1999

The force that holds water together in the form of a stream within the xylem tube is the

A. Cohesion of water molecules to one another by hydrogen bonds
B. Force of gravity attacking the water molecules through the hydrogen bonds
C. Attraction between the water and xylem osmotic force
D. Normal flow of water from the ground with help of gravitational force

Question 20:

• JAMB 1999

Yellowing of leaves is a symptom associated with deficiency of

A. Iron, calcium and magnesium
B. Nitrogen, sulphur and potassium
C. Sulphur, phosphorus and iron
D. Magnesium, nitrogen and iron