IGCSE O Level Biology Practice Test 339
Human Biology Quiz Questions with Answers PDF Download - 339
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Human Biology Quiz with Answers PDF Download: MCQs 339
In humans, the sensitivity of respiratory diseases, eyes, and air passages is experienced due to
- carbon dioxide
- lead
- carbon monoxide
- sulphur dioxide
PH (power of Hydrogen) of about 8 is characteristic of
- sea water
- fresh water
- stagnant water
- lime water
Dull colored, smaller and non-scented flowers rely upon
- insect-pollination
- wind pollination
- self pollination
- cross pollination
Fish can come to the surface of the water for air-breathing in waters of
- low oxygen concentration
- high oxygen concentration
- low hydrogen concentration
- high hydrogen concentration
Carboxyhemoglobin is of
- bright red
- purplish red
- bright pink
- dark red
IGCSE O Level Biology Exam Prep Tests
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