Explanation: The Ganga-Brahmaputra delta, also known as the Sundarbans delta, is a vast region in West Bengal that is formed by the confluence of the Ganges and Brahmaputra rivers. This delta is characterized by its rich alluvial soil, which is highly fertile and conducive to agriculture. The region experiences a humid subtropical climate with high rainfall, making it an ideal location for the cultivation of certain crops.
One of the most significant crops grown in this delta is jute. Jute is a fiber crop that is used to produce a variety of products, including burlap, hessian, and twine. The cultivation of jute is a major economic activity in the region, providing employment to a large number of people. The delta's flat terrain, rich soil, and abundant water supply are particularly suitable for jute cultivation.
Jute requires a warm and humid climate, which is provided by the delta's tropical conditions. The crop is typically sown in March and harvested in July. The alluvial soil of the delta is rich in organic matter and nutrients, which are essential for the growth of jute. The high rainfall in the region ensures that the crop receives the necessary water for its growth, and the delta's network of rivers and canals provides an efficient irrigation system.
In contrast, other crops like tea, cotton, and maize are not as well-suited to the delta's conditions. Tea is primarily grown in the hilly regions of Darjeeling, where the cooler climate and well-drained soil are more favorable. Cotton requires a drier climate and well-drained soil, which are not characteristic of the delta. Maize can be grown in various parts of West Bengal, but the delta's conditions are more favorable for jute.
Therefore, jute is the primary crop that grows in the Ganga-Brahmaputra delta of West Bengal, making it the correct answer to the question. The delta's unique environmental conditions, including its alluvial soil and humid climate, make it an ideal location for jute cultivation, contributing significantly to the region's agricultural economy.