11 Why desert plants have thorns?
To discourage their being eaten up by animals
12 Smoke is the result of
Incomplete combustion
13 Mesons, particles of an atom, are now known to carry
Either charge
14 What is radium?
A radioactive element
15 The velocity of light is
299,782 KM/Sec
16 Astigmatism is corrected with the help of
Cylindrical lenses
17 The vitamin associated with rickets is
Vitamin D
18 The relation between pressure and temperature at constant volume is verified by
Pressure law
19 Legumes, such as clover, restore to the soil compound of
Nitrogen
20 Patella is anatomical name of
Knee bone
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