Answer:

Introduction:
Land degradation refers to the deterioration of land quality, often caused by human activities such as overgrazing, deforestation, and improper land use. Overgrazing is a significant factor contributing to land degradation in several states of India. In this context, the question asks about the states in which overgrazing is responsible for land degradation.

States where overgrazing is responsible for land degradation:
The correct answer to the question is option B, which includes Madhya Pradesh and Rajasthan. Let's understand why overgrazing is responsible for land degradation in these states:

1. Madhya Pradesh:
- Overgrazing is a major problem in Madhya Pradesh, which leads to land degradation.
- The state has a significant livestock population, and the demand for grazing land is high.
- Due to the large number of livestock, the vegetation cover gets depleted, and the soil becomes exposed, making it susceptible to erosion.
- Overgrazing also hampers the natural regeneration of vegetation, reducing biodiversity and affecting the ecological balance.
- The loss of vegetation cover and erosion of topsoil leads to the degradation of fertile land, making it unsuitable for agriculture.

2. Rajasthan:
- Rajasthan is a predominantly arid and semi-arid region with limited rainfall and scarce vegetation.
- Overgrazing is a severe problem in the state as livestock is a major source of livelihood for the rural population.
- The continuous grazing by livestock in arid and semi-arid areas leads to the removal of vegetation and exposes the bare soil.
- Without adequate vegetation cover, the soil becomes vulnerable to wind and water erosion.
- Over time, the fertile topsoil gets eroded, leading to land degradation, desertification, and loss of agricultural productivity.

Conclusion:
Overgrazing is responsible for land degradation in several states of India. In the context of the given question, Madhya Pradesh and Rajasthan are the states where overgrazing contributes significantly to land degradation. It is crucial to implement sustainable grazing practices and promote proper land management to mitigate the negative impacts of overgrazing and prevent further land degradation in these states.