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3191

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
View Answer & Discuss (6) WAEC 2013
3192
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
View Answer & Discuss (2) WAEC 2013
3193
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
View Answer & Discuss (1) WAEC 2013
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3194

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
View Answer & Discuss (1) WAEC 2013
3195
Which of the following substances is not complex carbohydrate?
  • A. Glycogen
  • B. Cellulose
  • C. Starch
  • D. Glucose
View Answer & Discuss (1) WAEC 2013
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