Jamb Biology 1983 Past Questions and Answers

Question 6:

• JAMB 1983

Which of the following elements are necessary for the formation of chlorophyll in a plant?

A. Magnesium and iron
B. Calcium and potassium
C. Calcium and sulphur
D. Potasium and sulphur
E. Phosphorus and potassium

Question 7:

• JAMB 1983

Which of the following statements is NOT true of mammalian erythrocytes?

A. They have haemoglobin
B. They appear yellow when looked at singly
C. They are disc shaped
D. The cell are more numerous than leucocytes
E. They have nuclei at maturity

Question 8:

• JAMB 1983

In woody plants, grass and water vapour are transported across the stems by the

A. Xylem fibres
B. Medullary rays
C. Sieve tubes
D. Phloem fibres
E. Phloem parenchyma

Question 9:

• JAMB 1983

Which of the following substance is not found in urine?

A. Water
B. Sodium chloride
C. Nitrogenous compounds
D. Calcium chloride
E. Nitrogenous salts

Question 10:

• JAMB 1983

The kidneys of all vertebrates act as osmoregulators. This means that they

A. Keep the composition of the plasma constant
B. Regulate osmotic processes
C. Control the volume of blood entering the kidneys
D. Decrease the osmotic pressure of the blood
E. Increase the osmotic pressure of blood