Match column I with column II and select the correct option.

Column I	Column II
A. Paul Ehrlich	1. Rivet popper hypothesis
B. Alexander von Humboldt	2. Biodiversity term
C. Robert May	3. Estimated the species diversity
D. Edward Wilson	4. Species-area relationship

The correct option is B A-1, B-4, C-3, D-2
Paul Ehrlich proposed the rivet popper hypothesis. The hypothesis explains the effect of decline in biodiversity on the ecosystem. It is an analogy where the ecosystem is compared to an airplane and species are compared to the rivets linking the various parts of the airplane.

Alexander von Humboldt, a German naturalist and geographer, proposed the species - area relationships during his extensive explorations in the South American jungles. He observed that, within a region, species richness increased with increasing explored area, but up to a certain limit.

Robert May estimated the global species diversity to be 7 million.

Sociobiologist Edward Wilson was the first person to popularise the term ‘biodiversity’ to describe the combined diversity at all the levels of biological organisation.