The correct answer is Lucknow. Explanation & Key Takeaways: • As per Census of India 2001, Million Plus Urban Agglomerations Cities are those urban areas with a population exceeding one million. • Lucknow, the capital city of Uttar Pradesh, was identified as one of the Million Plus Urban Agglomerations Cities in the Census 2001. • Lucknow's population crossed the one million mark during the 2001 census, making it eligible for this classification. • Other notable cities like Chandigarh also fall under this category, but Lucknow specifically satisfies the criteria for the given question. • Million Plus Cities are significant for urban planning and resource allocation by the government. Related Concepts: • Urban Agglomeration: • An Urban Agglomeration (UA) consists of a core city and its adjoining areas forming a continuous urban spread. • It includes the main city, towns, and outgrowths (like railway colonies, university campuses, etc.) linked to the urban core. • Million Plus Cities: • These cities have populations exceeding one million as per Census data. • Such cities are key focus areas for infrastructure development under schemes like Smart Cities Mission. • Census of India: • The Census is conducted every 10 years to collect demographic, social, and economic data. • Census 2001 was the 14th National Census exercise conducted in India. • Importance of Million Plus Cities: • These cities are crucial for economic activities, governance, and urban development. • They often serve as hubs for trade, education, healthcare, and employment opportunities.