Waec Biology 1990 Past Questions and Answers

Question 21:

• WAEC 1990

Which of the following are components of glomerular filtrate?

A. All the components of Blood except mineral salts
B. Water and salt only
C. All the components of blood except plasma protein and cells
D. Plasma proteins, red and white blood cells
E. Blood cells, amino acid, salts and nitrogenous wastes.

Question 22:

• WAEC 1990

The mechanism by which useful materials in the glomerular filtrate are taken back into the blood is known
as

A. Filtration
B. Reabsorption
C. Haemolysis
D. Osmosis
E. Dialysis

Question 23:

• WAEC 1990

Which of the following takes place during the process of detoxication in the liver?

A. Poisonous substances in the body are converted into harmless substances
B. Fats and oils are broken into finer particles through emulsification
C. Excess glucose in the blood are converted into glycogen and stored
D. Worn- out red blood cells are broken down
E. Enough heat is generated to sustain the activities of the liver

Question 24:

• WAEC 1990

The cup-shaped part of the Bowman’s capsule contains

A. Nephridium
B. Glomerulus
C. Loop of Henle
D. Nephron
E. Convoluted tubule

Question 25:

• WAEC 1990

The increase in width of blood vessels in the mammalian skin at high temperatures is known as

A. Vasodilation
B. Sweating
C. Vasoconstriction
D. Shivering
E. Evaporation