Overexploitation of groundwater is a concern in some parts of Tamil Nadu leading to:

The correct answer is: d) All of the above

Overexploitation of groundwater is a major concern in some parts of Tamil Nadu. This is because groundwater is a vital resource for drinking, irrigation, and industrial purposes. However, overextraction of groundwater can lead to a number of problems, including:

• Declining water tables: When groundwater is extracted faster than it can be replenished, the water table will decline. This can lead to problems such as water shortages, wells drying up, and land subsidence.
• Saline intrusion: When groundwater is extracted, it can create a void that is filled by seawater. This is known as saline intrusion, and it can contaminate freshwater supplies and make them unusable for drinking or irrigation.
• Crop failures: Groundwater is essential for irrigation, and when it is overexploited, crops can fail. This can lead to food shortages and economic problems.

It is important to manage groundwater resources sustainably to avoid these problems. This can be done by using water more efficiently, investing in rainwater harvesting, and developing alternative water sources.