Explanation:

• Valley of Flowers National Park (Uttarakhand) lies entirely in the temperate alpine zone of the Himalayas, at elevations generally above 3,200 m. This altitude supports alpine meadows, endemic flora, and no tropical/subtropical vegetation.
• Manas National Park (Assam) — Mostly tropical and subtropical grasslands/forests.
• Namdapha National Park (Arunachal Pradesh) — Has a wide altitudinal range from tropical evergreen forests to alpine meadows, but not entirely in the alpine zone.
• Neora Valley National Park (West Bengal) — Contains sub-tropical, temperate, and alpine vegetation, but not fully alpine.

Source: Environment (Factly)