IGCSE O Level Biology MCQs (O Level) From Textbook

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IGCSE O Level Biology MCQs – Mock Test 105

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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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