Ecology: O level Biology Learning App | IGCSE O Level Biology Notes e-Book PDF

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IGCSE O Level Biology Exam MCQs – Practice Test 4 (Chapter 6)

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Ecology O level Biology Test Questions and Answers PDF Download: MCQ 4

MCQ 16: Carbon dioxide (CO2) is released in the atmosphere through:

  1. respiration
  2. combustion
  3. decay
  4. all of above

MCQ 17: In context to ecology ,hydrophytes may be:

  1. partially submerged
  2. fully submerged
  3. free floating
  4. all of above

MCQ 18: In order to float, water weeds have:

  1. poorly developed vascular bundles
  2. poorly developed supporting tissues
  3. air spaces to help plant float
  4. small base area

MCQ 19: Due to osmotic pressure in marine fish, kidneys:

  1. excretes salts
  2. excretes small amount of water
  3. produce concentrated urine
  4. all of above

MCQ 20: Which is true in case of xerophytes:

  1. does not shed leaves in periods of drought
  2. develop fleshy stems
  3. have no mechanism to store water
  4. rely solely on leaves for photosynthesis

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