IGCSE O Level Biology MCQs - Chapter 6

Ecology: O level Biology Multiple Choice Questions (MCQ) PDF - 4

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Ecology O level Biology Questions & Answers PDF Download: MCQ Quiz 4

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

A) respiration

B) combustion

C) decay

D) all of above

MCQ 17: In context to ecology ,hydrophytes may be

A) partially submerged

B) fully submerged

C) free floating

D) all of above

MCQ 18: In order to float, water weeds have

A) poorly developed vascular bundles

B) poorly developed supporting tissues

C) air spaces to help plant float

D) small base area

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

A) excretes salts

B) excretes small amount of water

C) produce concentrated urine

D) all of above

MCQ 20: Which is true in case of xerophytes

A) does not shed leaves in periods of drought

B) develop fleshy stems

C) have no mechanism to store water

D) rely solely on leaves for photosynthesis

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