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IGCSE O Level Biology Exam Prep: 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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Ecology: O level Biology Notes App (Android & iOS)

Ecology O level Biology Notes App

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