The northern plains of Bihar are particularly suitable for the cultivation of:

The correct answer is: a) Rice and Wheat.

The northern plains of Bihar are particularly suitable for the cultivation of rice and wheat because of the following reasons:

• The climate is tropical monsoon, with a long, hot, humid summer and a short, cool, dry winter. This climate is ideal for the cultivation of rice and wheat, which are both tropical crops.
• The soil is fertile and alluvial, which means that it is rich in nutrients and well-drained. This type of soil is ideal for the cultivation of rice and wheat, which are both heavy feeders.
• The rainfall is adequate, with an average annual rainfall of 1,000-1,200 mm. This rainfall is essential for the cultivation of rice and wheat, which are both water-intensive crops.
• The topography is flat, which makes it easy to cultivate rice and wheat.
• The infrastructure is well-developed, with a good network of roads, railways, and irrigation canals. This infrastructure makes it easy to transport rice and wheat to markets and to irrigate the crops.

Maize and sugarcane are also grown in the northern plains of Bihar, but they are not as well-suited to the climate and soil as rice and wheat. Fruits and vegetables are also grown in the northern plains of Bihar, but they are mostly grown in small, scattered plots. Tea and coffee are not grown in the northern plains of Bihar.