Natural Vegetation & Forests MCQs for UPSC Prelims

Correct answer: D - Statement-I is incorrect but Statement-II is correct

The correct choice is (d). Tropical rainforest soils are actually nutrient-poor because heavy rainfall leaches minerals and most nutrients are held in the living biomass, so Statement-I is wrong. Statement-II is true, since the hot, humid conditions speed up decomposition and nutrients are rapidly taken up by plants rather than stored in the soil. Because only Statement-II is correct, options claiming both are correct or that Statement-I alone is correct are eliminated.

Correct answer: C - 2, 3 and 4

In savannahs the spread of forest is checked mainly by recurrent fires that destroy tree seedlings, by grazing and browsing herbivores that suppress young woody growth, and by a strongly seasonal rainfall regime with a long dry season that favours grasses over trees, which makes 2, 3 and 4 the intended answer per the official key. Burrowing animals, termites and soil properties influence local vegetation but are not the principal large-scale controls the question seeks. Some subject keys argued these factors are also relevant, so the item drew dispute, yet the official answer retains 2, 3 and 4.

Correct answer: C - 1 and 3 only

Tropical Wet Evergreen Forests need very high rainfall (over 250 cm) and occur in the wettest belts. Among the listed States they are found in Arunachal Pradesh (eastern Himalayan foothills) and Mizoram (high-rainfall north-east), so 1 and 3 are correct. Himachal Pradesh (2) is a Himalayan State with temperate and alpine vegetation, not tropical wet evergreen forest, so any option including it, or '1 only', is wrong.

Correct answer: D - 1, 2 and 3

All three are genuine xerophytic adaptations that reduce transpiration in deserts. A hard, waxy cuticle limits water loss, tiny leaves reduce surface area for evaporation, and thorns (modified leaves, as in cacti) minimise transpiration while deterring herbivores. Since statements 1, 2 and 3 are all valid, the answer is 'D' (1, 2 and 3); any option excluding one of them is incomplete.

Correct answer: A - Meghalaya

The famous living root bridges are found in Meghalaya, especially in the Khasi and Jaintia Hills (Cherrapunji, Mawlynnong, Nongriat). The Khasi people guide the aerial roots of the Ficus elastica (rubber fig) across streams over many years until they form sturdy, self-strengthening bridges. Himachal Pradesh, Jharkhand and Tamil Nadu have no such tradition, and their climate and tree species do not support this practice, so they are wrong.

Correct answer: D - 1, 2 and 3

Equatorial rainforests are characterised by tall, densely packed trees whose crowns interlock to form a continuous canopy (statement 1), by exceptional biodiversity with a large number of coexisting plant and animal species (statement 2), and by abundant epiphytes such as orchids and ferns growing on the trees in the humid environment (statement 3). Since all three are hallmark features of equatorial forests, option (d) is correct and the partial options (a), (b) and (c) are incorrect.

Correct answer: D - Andaman and Nicobar Islands

The Andaman and Nicobar Islands uniquely combine all three formations: extensive mangroves fringe the creeks and tidal flats, tropical wet evergreen forests cover the humid interiors, and moist deciduous patches occur on the Andaman group. North coastal Andhra Pradesh has mainly moist and dry deciduous forests with some mangroves near river mouths but lacks true evergreen forest. South-West Bengal has the Sundarbans mangroves and deciduous tracts but no evergreen forest. Southern Saurashtra is semi-arid, dominated by dry deciduous and thorn forests with mangrove patches along the gulf coasts, and has no evergreen cover.

Correct answer: A - Arunachal Pradesh

Arunachal Pradesh lies at roughly the same latitude (around 27-29 degrees North) as northern Rajasthan, has more than 80% of its geographical area under forest cover (one of the highest in India), and a large share of that forest falls within national parks and sanctuaries forming its Protected Area Network, so it matches all three clues. Assam has far lower forest cover (around a third of its area), Himachal Pradesh sits at a higher northern latitude and is largely above the tree line in parts with much lower forest percentage, and Uttarakhand also has well under 80% forest cover; none satisfies all three conditions simultaneously.