Question

In fire files the flashes are produced due to the slow combustion of a protein luciferin in air and moisture . The phenomenon is known as :
A.Photochemical change
B.Photo combustion
C.Chemiluminescence
D.None of these

Answer 1

Hint: Fireflies are one of those animals which produce their own light and glow in the dark and they do so because of combustion of luciferin with air and moisture which gives oxyluciferin , light and other products .

Complete step by step answer:
We know that fireflies are one of the animals which produce their own light or we can say, they have the property to glow in dark .
Other such animals which show this property are the members of the phylum ctenophora , molluscs , etc. These animals have the property to convert chemical energy into light energy. The animals produce light due to a chemical reaction that occurs in them .A high energy intermediate is formed due to reaction between two chemicals .
In fireflies, the production of light is due to the presence of a chemical luciferin , which undergoes combustion through the consumption of ATP.
The reactants are oxygen, calcium, ATP and the chemical luciferin which combine with each other in the presence of the enzyme luciferase , light is produced.
$luciferin+ATP+O_2+Ca\to oxyluciferin+light+AMP+PPi$
The luciferase enzyme is used to speed up the reaction as it is a bio-catalyst .
The energy released in the fireflies is used to produce an electronically excited state of oxyluciferin that is the bioluminescence product of the reaction .Subsequently , the relaxation of excited state to the ground state of the electron is achieved by the emission of a photon of light . This process is called Chemically Initiated Electron Exchange Luminescence or CIEEL .
The property of glowing in the dark is called bioluminescence or chemiluminescence .

So, the correct answer is Option C.

Note:
The light which is produced by fireflies is a result of a chemical reaction . So chemiluminescence has many applications like for the production of children's toys and glow sticks, analysis of many organic and inorganic species is also done with its help .