Why do tropical regions have higher biodiversity than polar regions?

Several reasons: (1) Evolutionary time — tropics have been climatically stable for millions of years, allowing more time for species to evolve and diversify. Polar regions were frequently glaciated, resetting biodiversity. (2) Productivity — higher solar energy input in tropics → greater photosynthesis → more food availability → supports more species. (3) Less seasonality — relatively constant temperature and rainfall year-round allow more specialisation. (4) Greater habitat complexity — tropical forests have multiple vertical layers (canopy, understory) providing many niches.

What is the difference between endemic and endangered species?

Endemic species: Species that are native to and restricted to a specific geographic area and are found nowhere else in the world. Example: Lion-tailed macaque (Western Ghats), snow leopard (Himalayas). Being endemic doesn't necessarily mean endangered. Endangered species: Species at very high risk of extinction due to rapid population decline or habitat destruction (IUCN category EN). Example: Bengal tiger, Indian rhinoceros. A species can be both endemic AND endangered (e.g., Great Indian Bustard — endemic to Indian subcontinent + endangered).

Biodiversity Patterns, Threats, and Conservation Strategies

Biodiversity and Conservation • Class 12 Biology • NCERT • CBSE

Biodiversity hotspots: 34 regions worldwide (India has 4). Threats: HIPPO — Habitat loss, Invasive species, Pollution, Population growth, Overhunting. In-situ conservation: National parks, biosphere reserves. Ex-situ: Zoos, seed banks.

Key Formulas

Species-area relationship: S = CA^Z
Log form: log S = log C + Z log A
Z = 0.1–0.2 (small islands); 0.6–1.2 (continents)

Frequently Asked Questions

Why do tropical regions have higher biodiversity than polar regions?: Several reasons: (1) Evolutionary time — tropics have been climatically stable for millions of years, allowing more time for species to evolve and diversify. Polar regions were frequently glaciated, resetting biodiversity. (2) Productivity — higher solar energy input in tropics → greater photosynthesis → more food availability → supports more species. (3) Less seasonality — relatively constant temperature and rainfall year-round allow more specialisation. (4) Greater habitat complexity — tropical forests have multiple vertical layers (canopy, understory) providing many niches.
What is the difference between endemic and endangered species?: Endemic species: Species that are native to and restricted to a specific geographic area and are found nowhere else in the world. Example: Lion-tailed macaque (Western Ghats), snow leopard (Himalayas). Being endemic doesn't necessarily mean endangered. Endangered species: Species at very high risk of extinction due to rapid population decline or habitat destruction (IUCN category EN). Example: Bengal tiger, Indian rhinoceros. A species can be both endemic AND endangered (e.g., Great Indian Bustard — endemic to Indian subcontinent + endangered).

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