Waec Biology Past Questions and Answers

Question 11:

• WAEC 1989

Four cells with osmotic potential equivalent to that of 3% salt solution were immersed respectively in solutions
of different concentrations labeled as follows: I = 4% salt solution; II = 6% salt solution III = 1% salt solution;
IV = 10% salt solution; V = 5% salt solution. Which of the solutions will cause an increase in osmotic
pressure within the cell?

A. I
B. II
C. III
D. IV
E. V

Question 12:

• WAEC 1989

Which of the following statements is not true of osmotic process?

A. There must be a selectively permeable membrane
B. The two solutions must be of different concentrations initially
C. T involves only the movement of water molecules
D. Equilibrium is reached when there is equal distribution of water molecules
E. . The two solutions are of equal concentration at the beginning of experiment.

Question 13:

• WAEC 1989

Which of the following is the correct route for the movement of materials through the kidney?

A. Glomerulus → Bowman’s capsule → Loop of Henle → Collecting tubule → Pelvis
B. Glomerulus → Loop of Henle → Collecting tubule → Bowman’s capsule → Pelvis
C. Pelvis → Bowman’s capsule → Glomerulus →Loop of Henle → Collecting tubule
D. Bowman’s capsule → Glomerulus → Loop of Henle → Collecting tubule → Pelvis
E. Bowman’s capsule → Loop of Henle →Glomerulus → Collecting tubule → Pelvis

Question 14:

• WAEC 1989

Which of the following is the function of the hormone in the lslets of Langerhans?

A. Is used in protein metabolism
B. Is involved in sugar synthesis
C. Aids the rate at which glucose is converted to glycogen
D. Controls the fluid content of the body
E. Plays a role in the pH balance of the body fluid

Question 15:

• WAEC 1989

Blood in mammals transports oxygen because it contains the pigment called

A. Haemoglobin
B. Chlorocruorin
C. Melanin
D. Haemocyanin
E. Haemoerythrin.