Growth stocks including Amazon.com AMZN.O, Microsoft Corp MSFT.O, Tesla TSLA.O and Nvidia NVDA.O fell between 0.8% and 2.7%. By Devik Jain and Sabahatjahan Contractor March 3 (Reuters) - Megacap growth stocks dragged the Nasdaq and S&P 500 lower on Thursday as investors worried that soaring commodity prices due to the Ukraine crisis will add to inflationary pressures. U.S. stocks rallied sharply on Wednesday after Federal Reserve Chief Jerome Powell said he will back a quarter point rate increase when the Fed meets March 15-16, assuaging some fears of an aggressive policy tightening by the U.S. central bank.