This thesis is aimed to understand the response of the Indian monsoons and associated biogeochemical processes in the Eastern Arabian Sea (EAS) to the past climate change. The EAS bordering the western coast of India is an important region to understand the past climate variation because the region has been shown to contain valuable sedimentary records relating to evidences of regulating glacial-interglacial climate. However, the palaeoclimate studies from this region are very limited unlike the western part of the basin. The role of low-latitude tropical oceans gains importance in global climate change as the southern high-latitude oceans failed to provide unambiguous evidences for regulating the glacial-interglacial climate. Few intriguing observations such as the Indian Monsoons providing important feedback for global climate change, Arabian Sea hosting high productivity and intense denitrification, and the past changes in the Indian Monsoons correlating with the northern high latitude Dansgaard-Oeschger type rapid climate fluctuations render the Arabian Sea as one of the very significant oceanic areas for understanding the feedbacks for the past climate change.