The correct option is (d).
Explanation
In mountainous areas, the decrease in temperature with increasing altitude leads to a corresponding change in natural vegetation. This results in a distinct succession of vegetation belts from tropical to alpine types. In the Himalayas, specific altitude ranges support distinct forest types.
Analysis of the 1500–3000 m Zone:
- Temperate Forests: The altitude range between 1,500 and 3,000 metres is characterized by temperate forests.
- Vegetation Type: This zone is dominated by coniferous trees.
- Characteristic Species: According to standard geographical classifications, the prominent trees found in this belt include Pine, Deodar, Silver fir, Spruce, and Cedar.
- Specific Distributions:
- Pine: While Chir Pine is found at slightly lower altitudes (1000–2000 m), Blue Pine is found at higher elevations within this zone.
- Deodar: Typically found between 1500 and 2500 metres, it is a highly valued timber tree.
- Spruce and Silver Fir: These are generally found in the higher reaches of this zone (2200–3000 m).
Since all four trees listed are conifers characteristic of the temperate belt within the 1500–3000 metre range, all options are correct.
Key Takeaway: The Himalayan temperate zone (1500–3000 m) is defined by the presence of coniferous forests comprising species like Pine, Deodar, Silver fir, Spruce, and Cedar.