WAEC Biology Past Questions & Answers - Page 154

766.

Which of the following substances is not a complex carbohydrate?

A.

Glycogen

B.

Cellulose

C.

Starch

D.

Glucose

Correct answer is D

No explanation has been provided for this answer.

767.

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

Correct answer is B

No explanation has been provided for this answer.

768.

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

Correct answer is C

No explanation has been provided for this answer.

769.

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.

Removing leaves from plants

Correct answer is C

No explanation has been provided for this answer.

770.

The transportation 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

Correct answer is B

No explanation has been provided for this answer.