IGCSE O Level Biology Practice Test 339

Human Biology Quiz PDF: Questions and Answers - 339

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Human Biology Questions and Answers PDF Download: Quiz 339

MCQ 1691: In humans, the sensitivity of respiratory diseases, eyes, and air passages is experienced due to

A) carbon dioxide

B) lead

C) carbon monoxide

D) sulphur dioxide

MCQ 1692: PH (power of Hydrogen) of about 8 is characteristic of

A) sea water

B) fresh water

C) stagnant water

D) lime water

MCQ 1693: Dull colored, smaller and non-scented flowers rely upon

A) insect-pollination

B) wind pollination

C) self pollination

D) cross pollination

MCQ 1694: Fish can come to the surface of the water for air-breathing in waters of

A) low oxygen concentration

B) high oxygen concentration

C) low hydrogen concentration

D) high hydrogen concentration

MCQ 1695: Carboxyhemoglobin is of

A) bright red

B) purplish red

C) bright pink

D) dark red

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