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IGCSE O Level Biology MCQs (O Level) From Textbook

IGCSE O Level Biology MCQs – Mock Test 105

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Free GCE Biology Quiz App Download: "Enzymes are largely composed of"; MCQ with answers: carbohydrates, fat, minerals, and proteins. Learn What Are Enzymes Questions and Answers, Apple iBook to download free chapter to join virtual laboratories.

GCE Biology Quiz – Mock Test 105 PDF Download

MCQ 521: Enzymes are largely composed of:

  1. fat
  2. carbohydrates
  3. proteins
  4. minerals

MCQ 522: Larvae breath through the help of:

  1. feeding brushes
  2. pair of air floats
  3. pair of spiracles
  4. pair of gills

MCQ 523: Profuse growth of algae occurs due to:

  1. hydrogen sulphide in water
  2. nitrates and phosphates in water
  3. carbon dioxide in water
  4. chlorine in water

MCQ 524: Small size and light weight ensures:

  1. proper seed dispersal
  2. seed dispersal through wind
  3. seed dispersal through water
  4. seed dispersal through insects

MCQ 525: Apart from other reasons, excess thyroxin may cause:

  1. myxedema
  2. heart attack
  3. meningitis
  4. obesity

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