Waec Biology 1993 Past Questions and Answers

Question 11:

• WAEC 1993

Which of the following is the medium of transportation of nutrients within unicellular organisms?

A. Blood
B. Serum
C. Protoplasm
D. Plasma
E. Lymph

Question 12:

• WAEC 1993

Which of the following blood vessels carries oxygenated blood into the heart?

A. Pulmonary vein
B. Anterior vena cava
C. Pulmonary artery
D. Aorta
E. Posterior vena cava

Question 13:

• WAEC 1993

The conditions that ensure successful exchange of gases in multicellular organisms include the following except

A. Concentration gradient across the respiratory surface
B. Concentration gradient across the respiratory surface B. presence of thin membrane as the respiratory surface
C. Last transportation of absorbed gases
D. Presence of large surface area of the respiratory organ
E. Presence of small, dry surface area of the respiratory organ

Question 14:

• WAEC 1993

The respiratory organ found in the cockroach is the

A. Air sac
B. Trachea
C. Lung book
D. Lung
E. Gill

Question 15:

• WAEC 1993

Which of the following structures functions as an excretory, system found in flatworm?

A. Contractile vacuole
B. Nephridium
C. Flame cell
D. Malplghlan tubule
E. Kidney