* Sun Pharma arm exercises option to buy more Taro Pharma shares
* Equity Alert: Morgan Stanley sees 25-30% more fall in bank shares
* UCO Bank head says got Chidambaram nod for follow-on public issue
* BHEL gets 5.06-bln-rupee rig revamp, supply order from ONGC
* Even a few hours extra can be taxing
* S&P sees India FY09 GDP growth slowing to 7.8% from 9.0% yr ago
* Govt says steel cos can hike prices after Jul if input costs rise
* Equity Alert: Fertiliser cos surge on new potash, phosphate policy
* Equity Alert: SBI rises over 3% after 50 bps hike in benchmark PLR
* Double-digit inflation to stay for some more weeks: FM