NEET · Biology —

Biodiversity and Conservation appeared 5 times across 1 year — 5.6% of Biology. This question is from Loss of Biodiversity.

Year 2024 Total
Questions 5 5
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Which of the following statements are correct? A. The Amazon rainforest being cut and cleared for cultivation of soyabeans is an example of habitat loss. B. Steller's sea cow and passenger pigeon became extinct due to over-exploitation by humans. C. The Nile perch introduced into Lake Victoria in East Africa helped in population growth of cichlid fish in the lake. D. Water hyacinth is an invasive species. E. When a species becomes extinct, the plant and animal species associated with it are not affected. Choose the correct answer from the options given below:

Solution & Explanation

Core Logic

Let's evaluate each statement:

  • Statement A is correct. Clearing the Amazon for soyabeans represents severe habitat loss and fragmentation.
  • Statement B is correct. Over-exploitation by humans in the last 500 years led to the extinction of Steller's sea cow and the passenger pigeon.
  • Statement C is incorrect. The introduction of the Nile perch into Lake Victoria led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the lake, not their population growth.
  • Statement D is correct. Water hyacinth (Eichhornia) is a notorious invasive alien species.
  • Statement E is incorrect. When a species becomes extinct, the plant and animal species associated with it in an obligatory way also become extinct (this is known as Co-extinction).
Step 1: Final Conclusion

Only statements A, B, and D are correct.

Pattern Recognition

Alien species introduction usually causes extinction (Nile Perch → Cichlid fish death), not population growth. Recognizing C is false immediately eliminates options 1 and 4. Recognizing E is false (due to co-extinction) eliminates option 3.

Chapter Mix

Class 12 Biology: Biodiversity and Conservation

Reference Study Guides

Biodiversity And Conservation

More Biodiversity and Conservation Previous-Year Questions

Q91 neet_2026_03_may_morning Causes of Biodiversity Loss
"The Evil Quartet" of biodiversity loss includes which of the following?
  • A. Over-exploitation; Alien species invasions; Air pollution; Co-extinctions
  • B. Habitat loss and fragmentation; over-exploitation; Alien species invasions; Co-extinctions
  • C. Habitat loss and fragmentation; Air pollution; Water pollution; Co-extinctions
  • D. Over-exploitation; Alien species invasions; Soil pollution; Co-extinctions

Solution

Core Logic

'The Evil Quartet' is the sobriquet used to describe the four major causes of biodiversity loss.

These four causes include:

  • Habitat loss and fragmentation
  • Over-exploitation
  • Alien species invasions
  • Co-extinctions
Step 1: Final Conclusion

Analyzing the options, only the second option correctly lists all four components of the 'Evil Quartet'.

Pattern Recognition

Shortcut: Memorize the 'Evil Quartet' acronym HOAC (Habitat loss, Over-exploitation, Alien invasion, Co-extinctions). Pollution is a factor but not explicitly one of the named 'Quartet'.

Chapter Mix

Class 12 Biology: Biodiversity and Conservation

Q117 neet_2026_03_may_morning Conservation Strategies
Exploring molecular, genetic and species-level diversity for products of economic importance is called
  • A. Biomagnification
  • B. Biofortification
  • C. Bioremediation
  • D. Bioprospecting

Solution

Core Logic
  • Bioprospecting: The exploration of molecular, genetic and species-level diversity for products of economic importance.
  • Biomagnification: The increase in concentration of a toxicant at successive trophic levels.
  • Biofortification: Breeding crops with higher levels of vitamins and minerals, or higher protein and healthier fats.
  • Bioremediation: The use of living organisms to remove environmental pollutants.
Step 1: Final Conclusion

The given definition strictly matches Bioprospecting.

Pattern Recognition

Prospecting = searching/exploring (like gold prospecting). Exploring genetic diversity for economic products = Bioprospecting.

Chapter Mix

Class 12 Biology: Biodiversity and Conservation

Q124 neet_2026_03_may_morning Conservation Strategies
Which of the following is an in situ conservation method?
  • A. Sacred Groves
  • B. Wildlife Safari Parks
  • C. Botanical Gardens
  • D. Seed Banks

Solution

Core Logic

In-situ (on-site) conservation means protecting the organism in its natural habitat.

  • Sacred Groves: Forest fragments of varying sizes protected by religious communities (Natural habitat, In-situ).
  • Wildlife Safari Parks: Artificial enclosures designed to mimic nature (Ex-situ).
  • Botanical Gardens: Man-made collections of living plants for reference (Ex-situ).
  • Seed Banks: Artificial cryopreservation or storage facilities (Ex-situ).
Step 1: Final Conclusion

Sacred Groves represent an in-situ conservation method.

Pattern Recognition

In-situ = Biosphere reserves, National parks, Sanctuaries, Sacred groves. Ex-situ = Zoos, Gardens, Safari parks, Gene/Seed banks.

Chapter Mix

Class 12 Biology: Biodiversity and Conservation

Q129 neet_2026_03_may_morning Mass Extinction
Since the origin and diversification of life on Earth, there have been five episodes of mass extinction of species. How is the sixth extinction, which is in progress, different from the previous episodes?
  • A. The current species extinction rates are far lower than those in previous episodes.
  • B. The present species extinction rates are 100 to 1000 times faster than in the pre-human times.
  • C. The present net species extinction rate is zero.
  • D. The current species extinction rate is nearly 10 times faster than in previous episodes.

Solution

Core Logic

The 'Sixth Extinction' is currently in progress and is entirely driven by anthropogenic (human) activities. Ecologists estimate that the current species extinction rates are 100 to 1000 times faster than the natural background extinction rates seen in pre-human times.

Step 1: Final Conclusion

The defining characteristic of the sixth mass extinction is this severely accelerated rate.

Pattern Recognition

Direct NCERT data point: Current extinction rate = 100 - 1000x faster than pre-human times.

Chapter Mix

Class 12 Biology: Biodiversity and Conservation

More Biodiversity and Conservation Questions — neet_2026_03_may_morning

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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)