Question

what is under standard meridian? what is India standard meridian? what is it significance?

Answer 1

standered meridian is an imaginary line which passes through the center of a country for exact time as time in one place is different from another

Answer 2

Standard Meridian is the meridian (longitude)which is used to describe time of a country , it should be the same for the whole country and all the places in a country should follow this same time

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The standard meridian of India is 82.5 ° E and it passes through the center of our country and passes through  Mirzapur in Uttar Pradesh

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its significance is that

1)there will be no confusion about time in an country

2)all the places in a particular country will have the same time