Bacteria and viruses can be seen under intense source of light known as "candling".
a) true
b) false

False

Explanation:

Candling is used to study the embryo. An intense source of light is placed behind the egg to visualize the internal developments and changes. Here, candle is used as a source of light.  

Bacteria and viruses cannot be observed in the light of a candle. However a virus is much smaller as compared to a bacteria and it can be seen only in electron microscope.  

Thus, the given statement is false