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Biology Mcqs

How many milky teeth or primary teeth does a human have?

Biology Mcqs, Everyday Science Mcqs /
How many milky teeth or primary teeth does a human have?A. 33
B. 20
C. 15
D. 32

Humans usually have 20 primary (deciduous, “baby” or “milk”) teeth and 32 permanent (adult) teeth. Most people know these teeth as baby teeth, though they are also sometimes called milk teeth or primary teeth. In all, children have 20 baby teeth – 10 on the top and 10 on the bottom. These teeth act as placeholders for the adult teeth that grow in after the baby teeth fall out.

 

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Biology Mcqs, Everyday Science Mcqs

Which one of the following toxic metals is extensively present in newspaper?

Biology Mcqs /
Which one of the following toxic metals is extensively present in newspaper?

A. Mg
B. Cd
C. Pb
D. Hg

Newspaper contains a toxic material called lead. It is a naturally occurring toxic metal found in the Earth’s crust. Lead can harm production of blood cells and the absorption of calcium needed for strong bones and teeth, muscle movements, and the work of nerves and blood vessels.
Lead is a chemical element with the symbol Pb and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is silvery with a hint of blue; it tarnishes to a dull gray color when exposed to air.

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Biology Mcqs