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NEET Biology · Ecology and Environment

Biodiversity: concept, patterns and importance

Taught in NCERT Class 12 Biology, Chapter 13: Biodiversity and Conservation.

2 verified questions: Easy 0 · Medium 2 · NEET level 0

Sample questions

Sample 1Medium

A graph of species richness (S) against area (A) is a rectangular hyperbola on ordinary axes, and a straight line on logarithmic axes described by log S = log C + Z log A. Which statement about this relationship is correct?

  1. A

    C is the slope and Z is the Y-intercept

  2. B

    Z is about 0.6 to 1.2 for small regions and 0.1 to 0.2 for whole continents

  3. C

    Z differs greatly between taxonomic groups in the same region

  4. D

    Z is the slope of the line; it is about 0.1 to 0.2 for most regions, but 0.6 to 1.2 for very large areas such as whole continents

Show the answer
The answer is D.

Humboldt observed that species richness rises with area up to a limit; on log axes the relation is linear with slope Z. Z lies between 0.1 and 0.2 regardless of taxonomic group or region, but for very large areas such as continents it is much steeper, 0.6 to 1.2.

  • A.

    In the equation, Z is the slope (regression coefficient) and log C is the intercept.

  • B.

    The values are reversed: slopes are steeper for very large areas.

  • C.

    Slopes are remarkably similar regardless of taxonomic group or region.

NCERT: Class 12 Biology, Chapter 13, 13.1

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