Natural Vegetation (India) — Practice

Question 1

Describe two structural adaptations of mangrove forests that allow them to survive in tidal environments.

Accepted Answer

(1) STILT ROOTS (prop roots): large, above-ground roots that spread out from the trunk and lower branches to provide structural support in unstable, waterlogged, soft mudflat soil. They also help anchor the tree against tidal currents. (2) PNEUMATOPHORES (breathing roots): specialised roots that grow upward OUT OF the mud into the air, containing pores (lenticels) through which the roots can obtain oxygen — essential because waterlogged soil is anaerobic (oxygen-depleted). Together, these adaptations allow mangrove trees to survive conditions that would kill most terrestrial trees.

Question 2

Explain the altitudinal zonation of vegetation in the Himalayas, mentioning specific vegetation types and altitude ranges.

Accepted Answer

Himalayan vegetation changes with altitude, reflecting decreasing temperature and moisture: (1) SUBTROPICAL ZONE (up to 1,000 m): tropical deciduous forests in foothills. (2) WET TEMPERATE ZONE (1,000–2,000 m): Oak, Rhododendron, Chestnut in Eastern Himalayas; Chir Pine in Western Himalayas. (3) TEMPERATE CONIFEROUS ZONE (2,000–3,000 m): Deodar (most valuable timber), Blue Pine, Silver Fir, Spruce. Deodar forests are characteristic of the Western Himalayas. (4) SUB-ALPINE ZONE (3,000–3,600 m): Rhododendron, Juniper, Birch — shrubby, shorter trees. (5) ALPINE ZONE (above 3,600 m): Alpine meadows (called 'bugyals' in Uttarakhand, 'margs' in Kashmir) with grasses, mosses, lichens. NO TREES above the tree line (~3,600 m) — too cold and windy for woody growth. The tree line marks where the growing season becomes too short to sustain trees.

Question 3

Describe the major types of natural vegetation in India, linking each type to the rainfall condition and geographical location that produces it.

Accepted Answer

India's natural vegetation is a climate map written in trees: (1) TROPICAL EVERGREEN FORESTS (>200 cm): Western Ghats windward slopes (Kerala, Karnataka, Goa), NE India (Meghalaya, Assam, Arunachal), Andaman & Nicobar. Continuous high rainfall means trees don't need a dry-season strategy — they stay green year-round. Multi-layered, dense, over 60 m tall. Species: rosewood, mahogany, ebony, rubber. (2) TROPICAL DECIDUOUS FORESTS (70-200 cm): Most widespread type in India; found across central India, sub-Himalayan foothills, western Deccan. Seasonal rainfall → trees shed leaves in March-May dry season to reduce water loss. Moist deciduous (100-200 cm): teak, sal — high-value timber. Dry deciduous (70-100 cm): teak, sal, tendu (leaves used for bidis), palas. (3) TROPICAL THORN FORESTS (<50 cm): western Rajasthan, Gujarat, interior Karnataka and Deccan rain-shadow. Extreme water deficit forces xerophytic (drought-adapted) strategies: thorns instead of leaves, thick waxy bark, deep taproots (babul), succulents. Species: Khejri (state tree of Rajasthan), babul, ber. (4) MONTANE FORESTS (altitude-dependent): Himalayas show complete altitudinal zonation from subtropical to alpine (described above). (5) MANGROVES (tidal coasts): Sundarbans (largest in world), Godavari-Krishna-Kaveri deltas, Andaman coast. Specialised for intertidal zones: stilt roots, pneumatophores, salt-secreting glands. Home to Bengal tiger, saltwater crocodile. Each vegetation type is a perfect match to its moisture and temperature regime.

Practice — Natural Vegetation (India)

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