IGCSE O Level Biology Competitive Exam MCQs – Mock Test 339

Human Biology Notes Questions with Answers PDF Download – Test 339

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Human Biology MCQs – Mock Test 339 PDF Download

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

carbon dioxide
lead
carbon monoxide
sulphur dioxide

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

sea water
fresh water
stagnant water
lime water

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

insect-pollination
wind pollination
self pollination
cross pollination

MCQ 1694: 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

MCQ 1695: Carboxyhemoglobin is of:

bright red
purplish red
bright pink
dark red

IGCSE O Level Biology Notes App & eBook – Human Biology Competitive Exam

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