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Biology Past Questions and Answers

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Waec Biology Questions

Question 1491:

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

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

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Question 1492:

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

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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

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Question 1493:

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

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

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Question 1494:

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

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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

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Question 1495:

Which of the following substances is not complex carbohydrate?

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A Glycogen
B Cellulose
C Starch
D Glucose

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