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371
The stem differs from the root in having the xylem and phloem strands
  • A. on the same radii
  • B. scattered
  • C. on alternate radii
  • D. towards the pith
View Answer & Discuss (7) JAMB 1986
372
Oxygen liberated during photosynthesis has been demonstrated to come from
  • A. carbondioxide
  • B. air
  • C. water
  • D. chlorophyll
View Answer & Discuss (1) JAMB 1986
373
Which of these is a trace element?
  • A. Iron
  • B. Copper
  • C. Calcium
  • D. Sulphur
View Answer & Discuss (5) JAMB 1986
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374
The main organic substances found in the human body are
  • A. carbohydrates, proteins and salts
  • B. salts, fats and proteins
  • C. fat, carbohydrates and protein
  • D. salts, fats and carbohydrates
View Answer & Discuss (2) JAMB 1986
375
Which of the following elements is essential for the formation of haemoglobin?
  • A. Sodium
  • B. Potassium
  • C. Calcium
  • D. Iron
View Answer & Discuss (4) JAMB 1986
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