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Biology · 2022 · 3 marks
CBSE 2022 · Region 4 · Set 1 · Q7
(a) The graph given below shows species-area relationship of a certain region. (i) Study the graph and explain what it represents. (ii) After a…
The graph given below shows species-area relationship of a certain region.
(i)
Study the graph and explain what it represents.
(ii)
After a while, a small area was taken for constructing a road which divided the region into two. Write the impact this construction would have on species richness of the region.
How did Dr. David Tilman relate experimentally, the stability of a community and its species richness ? Explain.
Marking-scheme solution
(a) (i) "Within a region species richness increased with increasing explored area, but only up to a limit."
(ii) Very gradually impact on species diversity will be visible/species diversity will be gradually reduced/ negative impact on species diversity.
OR
(b) Dr. Tilman carried out long-term experiments in outdoor plots, he observed plots with more species showed less year-to-year variation in biomass, he showed increased diversity (species richness) contributed to higher productivity.
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