Introduction:
The Indian government operates at three levels - Central, State and Local. The Prime Minister and Chief Minister are the heads of the Central and State governments, respectively. However, at the local level, the Zilla Parishad Chairperson is not the head of the district administration. Instead, the District Magistrate (DM) or Collector is responsible for the administration of the district.

Reasons why DM or Collector administers the district:
1. Legal Authority:
The District Magistrate is a government officer appointed by the state government under the Indian Administrative Service. The DM has the legal authority to enforce law and order, maintain public peace and security, and ensure that government policies are implemented at the district level. The Zilla Parishad Chairperson, on the other hand, is an elected representative and does not have the same legal authority as the DM.

2. Administrative Experience:
The DM has administrative experience and expertise in managing the district. They are responsible for the implementation of government schemes and programs at the district level. They also have the power to allocate resources and funds for development projects. The Zilla Parishad Chairperson, on the other hand, may not have the same level of administrative experience or expertise.

3. Coordination with other government departments:
The DM serves as a liaison between the district administration and other government departments at the state and central levels. They coordinate with various departments such as the police, revenue, health, and education departments to ensure that government policies are implemented effectively at the district level. The Zilla Parishad Chairperson may not have the same level of coordination with other government departments.

4. Accountability:
The DM is accountable to the state government for the administration of the district. They are responsible for ensuring that government policies are implemented effectively and efficiently at the district level. The Zilla Parishad Chairperson, on the other hand, is accountable to the local people who elected them, but they may not have the same level of accountability to the state government.

Conclusion:
In conclusion, while the Zilla Parishad Chairperson is an elected representative of the people at the local level, the DM or Collector is responsible for the administration of the district. The DM has the legal authority, administrative experience, and coordination with other government departments to ensure that government policies are implemented effectively at the district level.

DM is not related to any political party or any political system and they are not elected but chairperson of Zilla Parishad is elected by the people. I know just this much further I don't know so I am unable to answer...