CUET UG Biology Ecology Biodiversity Types Hotspots Conservation Strategies

Must-Know (15–20 detailed bullets)

• Biodiversity has three levels: genetic, species, and ecological diversity; for example, genetic diversity in rice is seen in 50,000 varieties in India (verify from NCERT).
• Species diversity refers to the variety of species in a region; Western Ghats have higher amphibian species diversity than the Eastern Ghats.
• India is one of the 12 mega biodiversity countries, ranking 10th in species richness and 4th in endemic plant species.
• There are 34 global biodiversity hotspots; India hosts parts of 4: Himalayas, Western Ghats, Indo-Burma, and Sundaland (Nicobar Islands).
• To qualify as a biodiversity hotspot, a region must have at least 1,500 endemic vascular plant species and have lost ≥70% of original habitat.
• The Western Ghats are older than the Himalayas and show high endemism; 30% of flowering plants and 50% of amphibians are endemic here.
• Sacred groves (e.g., Khasi and Jaintia hills in Meghalaya) are traditional conservation areas protecting rare species.
• The term "biodiversity" was popularized by Edward Wilson, though coined by Walter G. Rosen.
• India has 10 biogeographic zones: Trans-Himalaya, Himalaya, Desert, Semi-Arid, Western Ghats, Deccan Peninsula, Gangetic Plain, Northeast, Coasts, and Islands.
• Endemic species are found only in a specific geographic area; the lion-tailed macaque is endemic to the Western Ghats.
• IUCN Red List categorizes species based on extinction risk; the red panda is listed as Endangered.
• Ex-situ conservation involves protecting species outside their natural habitat; examples include zoological parks and seed banks like the Svalbard Global Seed Vault.
• In-situ conservation protects species within their natural habitat; examples are national parks and biosphere reserves.
• The Convention on Biological Diversity (CBD) was signed at the Rio Earth Summit in 1992; India ratified it in 1993.
• The three main objectives of CBD: conservation of biodiversity, sustainable use of components, and fair sharing of benefits from genetic resources.
• The National Biodiversity Authority (NBA) was established in 2003 under the Biological Diversity Act, 2002, headquartered in Chennai.
• Biopiracy is the unauthorized use of biological resources; example: patenting of neem by a U.S. company (revoked after Indian challenge).
• Ramsar sites are wetlands of international importance; India has 80 Ramsar sites as of 2024 (verify from NCERT).
• Keoladeo National Park (Bharatpur, Rajasthan) was the first Ramsar site in India, designated in 1981.
• The ecosystem diversity in India ranges from tropical rainforests (Western Ghats) to alpine meadows (Himalayas).

Difficulty Level

Intermediate — requires integration of factual recall (hotspots, acts) with conceptual understanding (in-situ vs ex-situ, CBD objectives).

Common CUET Traps (3 bullets)

• Trap: Assuming all protected areas are biodiversity hotspots.
  Avoid: Biodiversity hotspots require both high endemism and habitat loss; not all protected areas meet these criteria.

• Trap: Confusing IUCN Red List with CITES.
  Avoid: IUCN assesses extinction risk; CITES (Convention on International Trade in Endangered Species) regulates trade in endangered species.

• Trap: Believing that species richness always indicates higher biodiversity.
  Avoid: Biodiversity includes evenness and genetic variation; high richness with low evenness may not mean high biodiversity.

Practice MCQs (5 questions)

Q1. Which of the following is NOT a criterion for a region to be designated as a biodiversity hotspot?
A. Presence of at least 1,500 endemic vascular plant species
B. Loss of at least 70% of original habitat
C. High species richness in mammals
D. High degree of endemism

Answer: C
Explanation: The two strict criteria are ≥1,500 endemic vascular plants and ≥70% habitat loss.
Why others fail: Option C sounds plausible due to association with biodiversity, but it's not an official criterion.

Q2. The National Biodiversity Authority (NBA) was established under which legislation?
A. Wildlife Protection Act, 1972
B. Forest Conservation Act, 1980
C. Biological Diversity Act, 2002
D. Environment Protection Act, 1986

Answer: C
Explanation: NBA was established under the Biological Diversity Act, 2002.
Why others fail: Option D is tempting as it's a major environmental law, but it does not establish NBA.

Q3. Which of the following pairs correctly matches a biodiversity hotspot with a region in India?
A. Sundaland – Andaman Islands
B. Indo-Burma – Western Ghats
C. Himalayas – Arunachal Pradesh
D. Cape Floristic Region – Kerala

Answer: C
Explanation: The Himalayas hotspot includes parts of Arunachal Pradesh.
Why others fail: Sundaland includes Nicobar, not Andaman; Western Ghats is part of Western Ghats hotspot, not Indo-Burma.

Q4. Ex-situ conservation includes all of the following EXCEPT:
A. Botanical gardens
B. Seed banks
C. Biosphere reserves
D. Cryopreservation

Answer: C
Explanation: Biosphere reserves are in-situ conservation sites.
Why others fail: Students often confuse biosphere reserves with botanical gardens, but the former is natural habitat-based.

Q5. Which of the following best describes the purpose of the Convention on Biological Diversity (CBD)?
A. To ban hunting of endangered species globally
B. To promote ex-situ conservation through zoos
C. To ensure fair and equitable sharing of benefits from genetic resources
D. To fund national parks in developing countries

Answer: C
Explanation: Fair and equitable benefit-sharing is one of the three core objectives of CBD.
Why others fail: Option A is covered by CITES, not CBD; CBD is broader and not enforcement-focused.

Last‑Minute Revision (15–20 one‑liners)

• ⚠️ Biodiversity = genetic + species + ecological diversity.
• ⚠️ 34 global hotspots; India has parts of 4: Himalayas, Western Ghats, Indo-Burma, Sundaland.
• ⚠️ Hotspot criteria: 1,500+ endemic plants AND ≥70% habitat loss.
• ⚠️ Western Ghats: older than Himalayas, high amphibian endemism.
• ⚠️ Sacred groves: Meghalaya (Khasi/Jaintia), Rajasthan (Bishnoi).
• ⚠️ IUCN Red List: assesses extinction risk (e.g., tiger – Endangered).
• ⚠️ CITES: regulates international trade in endangered species.
• ⚠️ CBD signed in 1992 at Rio Summit; 3 goals: conservation, sustainable use, benefit-sharing.
• ⚠️ Biological Diversity Act, 2002 → National Biodiversity Authority (NBA), Chennai.
• ⚠️ State Biodiversity Boards (SBBs) and Biodiversity Management Committees (BMCs) at local level.
• ⚠️ In-situ: inside habitat – national parks, sanctuaries, biosphere reserves.
• ⚠️ Ex-situ: outside habitat – zoos, seed banks, cryopreservation.
• ⚠️ Biopiracy example: neem patent revoked after Indian government challenged.
• ⚠️ Ramsar site: wetland of international importance; Keoladeo NP first in India (1981).
• ⚠️ India has 80 Ramsar sites (verify from NCERT).
• ⚠️ Endemic species: found only in one region (e.g., lion-tailed macaque – Western Ghats).
• ⚠️ India: 10 biogeographic zones.
• ⚠️ India: 12 mega biodiversity countries, ranks 10th in species richness.
• ⚠️ Term "biodiversity" popularized by Edward Wilson.
• ⚠️ Svalbard Global Seed Vault: ex-situ conservation in Norway.