For the following questions answer them individually
In a food chain, ______ can be taken as the average value for the amount of organic matter that is present at each step and reaches the next level of consumers.
In 1986, an operation had to be conducted against terrorists in the Golden Temple.
What was the name of this operation?
Natya Visharadha presented by His Excellency Shankar Dayal Sharma, in 1994 was given to ______________.
When a national GST subsumed central taxes on July 1, 2017, how many petroleum goods were kept out of its purview for the time being?