Union Finance Minister Nirmala Sitharaman on Monday said India faces a range of external and domestic challenges, including uncertainty over foreign exchange and crude oil prices, rising fertiliser costs and the possibility of below-normal rainfall, prompting the government to prepare for a less favourable monsoon scenario while maintaining adequate buffer stocks.Addressing concerns over the economic outlook, Sitharaman said, "India faces challenge of uncertainty over prices of foreign exchange, crude oil, besides shortfall of rains this year."The finance minister said the government is making preparations in anticipation of a weaker-than-expected monsoon and has ensured sufficient reserves to manage any adverse impact on supplies."Govt preparing for a not so good monsoon scenario, adequate buffer stocks maintained," she said.Sitharaman also noted mounting pressure on imports, particularly due to developments in global commodity and logistics markets."Imports of raw materials under severe strain," the finance minister said.