WAEC Past Questions and Answers - Page 4162

20,806.

The pigment in the malphigian layer responsible for skin colouration is known as

A.

haemoglobin

B.

haemocyanin

C.

chlorocruorin

D.

haemoerythrin

E.

melanin

Correct answer is E

No explanation has been provided for this answer.

20,807.

Which of the following statements on urine production is not correct?

A.

Concentrated urine is produced under the control of antidiuretic hormone

B.

The total volume of urine produced depends on the need for water excretion

C.

if there is excess intake of water, dilute urine is expected

D.

if there is a shortage of water in the body the volume of the urine produced is decreased

E.

in the presence of antidiuretic hormone dilute urine is produced

Correct answer is E

- Antidiuretic hormone binds to receptors on cells in the collecting ducts of the kidney and promotes reabsorption of water back into circulation.

-  Its most important role is to conserve the fluid volume of your body by reducing the amount of water passed out in the urine.

20,808.

Deamination is the process during which

A.

excess amino acid is broken down into ammonia and keto acid

B.

fats and oil are converted into an emulsion for absorption

C.

excess glucose is converted and store as glycogen in the liver

D.

glycogen is reconverted into glucose through the action of glucagon

E.

excess amino acid is converted into proteins

Correct answer is A

No explanation has been provided for this answer.

20,809.

The thoracic cavity is separated from the abdominal cavity by a sheet of muscle called

A.

pleural membrane

B.

intercostal muscles

C.

diaphragm

D.

pericardium

E.

epiglottis

Correct answer is C

No explanation has been provided for this answer.

20,810.

Which of the following blood components has the greatest affinity for oxygen and carbondioxide?

A.

Blood plasma

B.

Leucocytes

C.

Thrombocytes

D.

Erythrocytes

E.

Lymphocytes

Correct answer is D

No explanation has been provided for this answer.