Correct Option
The correct option is Landforms.
Explanation
The distribution and density of population are heavily influenced by geographical factors, primarily landforms (relief), climate, soil, and availability of water. While multiple factors interact, the physical configuration of the land often serves as the foundational constraint or enabler for human settlement.
Detailed Analysis
- Landforms (Primary Factor): The contrast between the Ganga plains and the Himalayan mountain zones is a classic example of how relief determines population density.
- The Ganga Plains offer vast, flat, and fertile alluvial land. This topography is highly conducive to intensive agriculture, the development of transport networks (roads and railways), and industrialization, supporting a very high population density.
- The Himalayan Zones are characterized by rugged terrain, steep slopes, and high altitudes. These physical features severely limit the availability of arable land, make infrastructure development difficult and expensive, and restrict large-scale human habitation.
- Climate: While climate is a significant determinant (harsh winters in the Himalayas vs. favorable monsoon climate in the plains), the physical limitation imposed by the terrain (landforms) is the immediate and most distinct differentiator in this specific comparison. Even in areas with bearable climates within the mountains, the lack of flat land restricts density.
- Urbanisation and Minerals: These are economic factors. Urbanisation is generally a consequence of favorable physical conditions rather than the primary cause of the regional difference. Minerals may create isolated pockets of density (e.g., mining towns) but do not account for the uniform high density of the agricultural Ganga plains compared to the sparse population of the entire Himalayan range.
Key Takeaway: Landforms influence crop production and the ease of building infrastructure; therefore, flat plains invariably support higher population densities compared to rugged mountainous regions.