Waec Biology Past Questions and Answers

Question 1491:

• WAEC 2013

Conduction of water and mineral salts through the xylem vessels is enhanced because the xylem cells are

A. Thickened with lignin
B. Long, narrow tubes placed end to end
C. Close to the endodermis
D. Centrally placed in the roots

Question 1492:

• WAEC 2013

Which of the following factors is likely to increase the rate of transpiration in plants?

A. A reduction in the number of stomata per unit surface area
B. Increase in humidity around the leaves of plants
C. An increase in leaf surface area to volume ratio
D. Removal of leaves from plant

Question 1493:

• WAEC 2013

The name of the enzyme that catalyses the conversion of glucose to glucose-6-phosphate at the beginning of glycolysis is

A. Phospho-fructokinase
B. Glucose isomerase
C. Hexokinase
D. Glucose-6-kinase

Question 1494:

• WAEC 2013

The correct arrangement of food classes of the same quantity in the order of magnitude of energy value in animals in descending order is

A. Carbohydrates, fats and oils, water, protein
B. Fats and oils, carbohydrates, protein, water
C. Water, fats and oils, carbohydrates, protein
D. Protein, fats and oils water and carbohydrates

Question 1495:

• WAEC 2013

Which of the following substances is not complex carbohydrate?

A. Glycogen
B. Cellulose
C. Starch
D. Glucose