why sudden volatility in last 45 min of trade on the contract closing day ??

Its has been my observation that most of the months ... there is a sudden volatility in the last 45 min of the closing day of the contract month ... example today being the last day of october series ... till the last 45 min ... the market was down about 15 - 20 on the sensex .... the all of a sudden ... the market went up ... to close nearly 120 points up !!!!

a) why does this happen on most of contract ending day ???

b) what are the factors which leads to this sudden volatility ??

c) is there a way to know which side it might go ???

Please advice
because at expiry day 6300pe have around 60rs..so if slightly up some points in nifty put will fall high speed ... and the option traders( FIIS&DIIS ) make money easily in last day..but need strengthen to bull/bear side people..(mostly expiry day bull/bear have equal strengthen)..
so 6300pe closed zero paisa on expiry day by last 40 minutes upmove and bulls make money..

happy trading

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