The floodplains of Bihar’s rivers are known for their:

The correct answer is: c) High fertility.

The floodplains of Bihar’s rivers are known for their high fertility. The floodplains are made up of rich alluvial soil that is deposited by the rivers during floods. This soil is ideal for growing crops, and the floodplains are home to a number of important agricultural areas.

The other options are incorrect. Option a) is incorrect because the floodplains are not known for their dense forests. Option b) is incorrect because the floodplains are not known for their arid landscape. Option d) is incorrect because the floodplains are not known for their rocky terrain.

Here is a more detailed explanation of each option:

• Option a) is incorrect because the floodplains are not known for their dense forests. The floodplains are home to a variety of plant life, but forests are not a dominant feature.
• Option b) is incorrect because the floodplains are not known for their arid landscape. The floodplains are located in a tropical climate, and they receive a significant amount of rainfall.
• Option d) is incorrect because the floodplains are not known for their rocky terrain. The floodplains are made up of alluvial soil, which is a type of soil that is deposited by rivers.

I hope this helps!