Plot purchase bangalore

Hi Experts,

I am planning to buy residential plot in Jala Hobili,Maresandra,Bangalore North.

The Layout seller is telling us that Layout is approved by Gram Panchayat and it is not DC converted or BIAAPA approved.They are also telling us that once the area comes under corporation BIAAPA  approval will be given automatically and we need not to worry about that .

The seller is also showing the Land map with Panchayat president signature on it.

We came to know that BIAAPA  approval is must when we are purchasing residential plot in Bangalore North area .

Please let me know on below details .

1. Is it enough to buy land approved by Gram Panchayat . 
2. Does Jala Hobli,Maresandra come under BIAAPA .
3. Steps to get BIAAPA  approval.

Thanks,

Bindhu