Which of the following is/are unique characteristic/characteristics of equatorial forests?Presence o

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UPSC Prelims is a competitive examination conducted in India. This question is from the 2013 UPSC Prelims Geography paper.

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This UPSC Prelims 2013 Geography question has a medium difficulty level and is marked as an important question.

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Question

Which of the following is/are unique characteristic/characteristics of equatorial forests?Presence of tall, closely set trees with crowns forming a continuous canopyCoexistence of a large number of speciesPresence of numerous varieties of epiphytesSelect the correct answer using the codes given below:

Accepted Answer

Correct Answer: D — 1, 2 and 3Step-by-step Solution:All three characteristics are uniquely and definitively associated with equatorial (tropical wet evergreen/rainforest) ecosystems:Characteristic 1 — Tall, closely set trees with continuous canopy: Correct. Equatorial forests are characterised by extremely tall trees (emergent layer: 40-60m+; canopy layer: 25-40m) that grow closely together, with their crowns interlocking to form a dense, continuous canopy that intercepts ~99% of incoming sunlight. This layered structure (emergent, canopy, understory, shrub, forest floor) is a defining structural feature. The canopy is so dense that the forest floor receives very little direct sunlight. ✓Characteristic 2 — Coexistence of a large number of species: Correct. Equatorial rainforests are Earth's most biodiverse terrestrial ecosystems, supporting an extraordinary diversity of species. While covering only about 7% of Earth's land surface, they harbour approximately 50% of all species on Earth. Species richness is extremely high — a single hectare of Amazonian rainforest can contain 300+ tree species (compared to perhaps 30 in a temperate forest). This coexistence of enormous numbers of species is uniquely characteristic of equatorial forests. ✓Characteristic 3 — Numerous varieties of epiphytes: Correct. Epiphytes (plants that grow on other plants without parasitising them — using them only for support) are exceptionally abundant and diverse in equatorial forests. Orchids, bromeliads, ferns, mosses, lichens, and other epiphytes cover the trunks and branches of trees throughout the forest layers. The high humidity and warmth of the equatorial climate, combined with the complex forest structure providing numerous microhabitats, creates ideal conditions for epiphytic diversity. ✓Key Concept: Equatorial/tropical rainforest structure: Emergent layer (tallest trees, 45-60m); Canopy (continuous leaf cover, 25-45m); Understory (shade-tolerant trees, 10-25m); Shrub layer (5-10m); Herb/ground layer (200 cm); no dry season; buttress roots on large trees for support in shallow soil; drip tips on leaves (for rapid water runoff); nutrient cycling is rapid (thin, nutrient-poor soils because nutrients are locked in biomass); lianas (climbing vines) common alongside epiphytes. Major equatorial forest regions: Amazon Basin (South America), Congo Basin (Africa), Southeast Asian archipelago (Borneo, Sumatra, New Guinea). Threats: deforestation, agricultural expansion (palm oil, cattle ranching, soy), logging, climate change.

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