Practice PPSC Everyday Science questions with answers and explanations.
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Nitrogen makes up about 78% of the atmosphere.
Oxygen is the second most abundant gas.
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Vitamin D promotes calcium and phosphate absorption.
It is important for healthy bones and teeth.
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Oxygen accounts for about 21% of dry air.
It supports respiration and combustion.
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Vitamin K is required to make several clotting factors.
Deficiency can increase bleeding risk.
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The troposphere contains most atmospheric water vapor.
Clouds, rain, and storms form mainly in this layer.
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Calcium combines with phosphate in mineralized tissues.
It also supports muscle and nerve function.
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Stratospheric ozone absorbs much ultraviolet radiation.
This helps protect living organisms from DNA damage.
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Ligaments stabilize joints by connecting bones.
They limit excessive movement.
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The cerebrum is the largest brain region.
It supports conscious thought, sensation, memory, and voluntary movement.
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The cerebellum fine-tunes movements and posture.
Damage can cause poor coordination.
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The medulla regulates vital involuntary functions.
These include breathing rhythm and heart rate.
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Neurons receive and transmit electrical and chemical signals.
They form the basic units of the nervous system.
