Every Book Back multiple-choice question from Biodiversity and its Conservation (12th Standard Zoology, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
Which of the following regions has maximum biodiversity?
- A. Taiga
- B. Tropical forestCorrect
- C. Temperate rain forest
- D. Mangroves
Explanation. Tropical forests have stable and congenial environmental conditions with high temperature and precipitation, which promote greater speciation and support maximum biodiversity compared to other regions.
Q2
Conservation of biodiversity within their natural habitat is called:
- A. In-situ conservationCorrect
- B. Ex-situ conservation
- C. In vivo conservation
- D. In vitro conservation
Explanation. In-situ conservation is the conservation of genetic resources and threatened species within their natural populations or ecosystems, protecting the entire habitat to allow species to thrive naturally.
Q3
Which one of the following does not come under in-situ conservation?
- A. Sanctuaries
- B. Natural parks
- C. Zoological parkCorrect
- D. Biosphere reserve
Explanation. Zoological parks represent ex-situ conservation because threatened animals are protected and bred in special care locations outside their natural homes, whereas sanctuaries, biosphere reserves, and national parks are in-situ.
Q4
Which of the following is considered a hotspot of biodiversity in India?
- A. Western Ghats
- B. Indo-Gangetic plain
- C. Eastern Himalayas
- D. A and CCorrect
Explanation. Both the Western Ghats and the Himalayas (including the Eastern Himalayas) are among India's four recognized biodiversity hotspots, characterized by high endemism and rapid habitat loss.
Q5
The organization which publishes the Red List of species is:
- A. WWF
- B. IUCNCorrect
- C. ZSI
- D. UNEP
Explanation. The International Union for Conservation of Nature (IUCN) compiles and publishes the Red List of Threatened Species, which provides a global index on the conservation status and extinction risk of taxa.
Q6
Who introduced the term 'biodiversity'?
- A. Edward Wilson
- B. Walter RosenCorrect
- C. Norman Myers
- D. Alice Norman
Explanation. The term biodiversity was introduced by Walter Rosen in 1986, while Edward Wilson later popularized the term to describe diversity at all levels of biological organization.
Q7
Which of the following forests is known as the 'lungs of the planet earth'?
- A. Tundra forest
- B. Rain forest of northeast India
- C. Taiga forest
- D. Amazon rain forestCorrect
Explanation. The Amazon rainforest is known as the lungs of the planet because of its vast size and dense vegetation, which harbors millions of species and plays a crucial role in absorbing carbon dioxide.
Q8
Which of the following are at high risk of extinction due to habitat destruction?
- A. Mammals
- B. Birds
- C. AmphibiansCorrect
- D. Echinoderms
Explanation. Amphibians are at the highest risk of extinction due to habitat destruction because they are highly sensitive to environmental changes in both their aquatic and terrestrial habitats.
Q9
Assertion: The environmental conditions of the tropics are favourable for speciation and diversity of organisms.
Reason: The climate, seasons, temperature, humidity and photoperiod are more or less stable and congenial.
- A. Both Assertion and Reason are true and Reason explains Assertion correctly.Correct
- B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- C. Assertion is true, but Reason is false.
- D. Both Assertion and Reason are false.
Explanation. The tropics enjoy stable, predictable, and congenial environmental conditions with less seasonal variation, which promotes evolutionary niche specialization and accelerates speciation, making both the assertion and reason true.
About these Biodiversity and its Conservation questions
These are the Book Back multiple-choice questions for Biodiversity and its Conservation from the Tamil Nadu State Board (Samacheer Kalvi) 12th Standard Zoology syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Biodiversity and its Conservation?
This chapter has 9 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 12th Standard Zoology MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Biodiversity and its Conservation book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
