Explanations:The Sunderban delta is a significant geographical feature located at the mouth of the Ganges and Brahmaputra rivers. It is a vast mangrove forest that is known for its unique ecosystem and is home to the Royal Bengal Tiger. The delta is shared between India and Bangladesh, with a substantial portion lying within the state of West Bengal, India.
Geographically, the Sunderban delta is formed by the confluence of the Ganges and Brahmaputra rivers as they flow into the Bay of Bengal. The delta is characterized by its intricate network of rivers, creeks, and tidal flats, which support a rich biodiversity. The mangrove forests of the Sunderban are not only a UNESCO World Heritage Site but also a critical habitat for various species, including the endangered Royal Bengal Tiger.
West Bengal, being one of the easternmost states of India, shares a border with Bangladesh and thus includes a significant part of the Sunderban delta within its territory. The delta is an important ecological and economic resource for the state, providing livelihoods for local communities through fishing, honey collection, and tourism.
It is important to note that while the Sunderban delta is a shared feature between India and Bangladesh, the question specifically asks about the Indian state that has parts of the Sunderban delta within its territory. Therefore, West Bengal is the correct answer, as it is the only Indian state that includes a significant portion of the delta within its borders.
Other options such as Bihar and Orissa (Odisha) are incorrect because they are located further north and south, respectively, and do not share a border with the Sunderban delta. The delta is a unique geographical feature that is primarily associated with the eastern coast of India and the neighboring country of Bangladesh.