India and Australia on Monday signed six memorandums of understanding (MoUs), including on cooperation in fighting international terrorism and on civil aviation security, following delegation-level bilateral talks headed by Prime Minister Narendra Modi and his Australian counterpart Malcolm Turnbull here.One MoU was signed on cooperation in fighting international terrorism and organised crime.A second MoU was signed on promotion and development of cooperation in civil aviation security.A third MoU was signed on cooperation in the field of environment, climate and wildlife.Another MoU was signed on cooperation in the field of sports.The Indian Space Research Organisation (ISRO) signed an MoU with Geoscience Australia on implementation arrangement on cooperation in earth observation and satellite navigation.A sixth MoU was signed on cooperation in the field of health and medicine.Following the exchange of agreements, Modi and Turnbull via video-conferencing jointly inaugurated the TERI-Deakin Nanobiotechology Centre (TDNBC) at TERI's Green Campus in Gurugram, Haryana.The Australian Prime Minister arrived here on Sunday on a four-day state visit to India.This is Turnbull's first bilateral visit to India since he assumed office in September 2015.His predecessor Tony Abbott had visited India in September 2014 and this was followed by Prime Minister Modi's visit to Australia in November that year.