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Biodiversity and Conservation

ICSE · Class 12 · Biology

Quick revision notes for Biodiversity and Conservation — ICSE Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

60 questions44 flashcards5 concepts

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A graph illustrating the species-area relationship, showing both the rectangular hyperbola (S=CA^Z) and its logarithmic linear form (log S = log C + Z log A).
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Key Topics to Revise

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1. Meaning, Types, and Definition of Biodiversity

  • Biodiversity is the diversity of life around us.
  • It is the variability among living organisms and the ecological complexes of which they are part.
  • It includes diversity within species, between species, and among ecosystems.
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2. Types of Biodiversity with Examples

  • Genetic diversity refers to variation of genes within a species.
  • India has more than 50,000 genetically different strains of rice and 1,000 varieties of mango.
  • Genetic variation in Rauwolfia vomitoria is seen in the potency and concentration of reserpine.
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3. Global Biodiversity and Patterns

  • Estimates of total species on Earth vary from 3 million to 30 million or more.
  • According to IUCN (2004), slightly more than 1.5 million species had been described.
  • Robert May gave a more conservative estimate of about 7 million species.
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4. Species-Area Relationship and Its Significance

  • Alexander Von Humboldt observed that species richness increases with explored area up to a limit.
  • On a graph, the species-area relationship forms a rectangular hyperbola.
  • On a logarithmic scale, the relationship becomes a straight line.

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Full Notes

Key Concepts

Biodiversity is the sum totalBiodiversity is commonly grouped into geneticSpecies diversity generally decreases fromIndia is one of the 12Biodiversity has narrowly utilitarian value through

Frequently Asked Questions

What are the important topics in Biodiversity and Conservation for ICSE Class 12 Biology?
Key topics in Biodiversity and Conservation include Three Levels of Biodiversity, Species-Area Relationship, Alpha, Beta, Gamma Diversity. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Biodiversity and Conservation — ICSE Class 12 Biology?
Understand the core concepts first, then work through the 60 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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