IGCSE O Level Biology Exam Prep MCQs – Mock Test 324

Physical Environment: Ecology MCQ with Answers PDF Download – Test 324

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Physical Environment: Ecology MCQ – Mock Test 324 PDF Download

MCQ 1616: If plants absorb carbon dioxide (CO₂) in water (H₂O), the water becomes:

alkaline
acidic
neutral
salty

MCQ 1617: Chlorophyll is a chemical substance, exists in chloroplasts of plants, with the property of:

green in color
changeable through light spectrum.
not green in color
absorbing red and blue light more, then other colors.

MCQ 1618: Nasal cavities and Eustachian tubes open in:

Larynx
Pharynx
Trachea
Glottis

MCQ 1619: Internal skeleton is made up of bones and cartilage in:

mammals
nematodes
arthropods
Echinodermata

MCQ 1620: Long term effects are incurred in man due to imbalance of:

adrenaline
thyroxin
testosterone
progestrone

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