Question

There are four ecological blocks that are given to determine species diversity. Species diversity depends on species richness. Species evenness and Taxonomic remoteness. Accordingly give the answer of given question:-

Which of the ecological blocks show the same degree of species richness?
A) A, B
B) A, B & C
C) A, B, C & D
D) A, B & D

Answer 1

Hint: Species richness is the count or the number of species present in a specific habitat, area or geographical location. It does not count the abundance of the species. It is the measure of the variety of species present in a given area.

Complete answer:
Species richness is the number of different species present in an ecological niche. It does not consider or take into account the abundance of the species. For example, in area “A” three different types of animals like cat, dog, goat are present and in another area “B”2 dogs and 3 cats are present. The species richness will be higher in A as 3 different species are present.
Species richness takes into account the variety of organisms not the number of the organisms.
Let us discuss the options given.
In option A- three different types of species are present : rat, ant and sparrow. A total of 12 animals are present. But richness is accessed by the type of organism that is 3.
In option B- three different types of species are present : rat, cow and sparrow. A total of 15 animals are present. But richness is accessed by the type of organism that is 3.
In option C- three different types of species are present : rat, ant and sparrow. A total of 15 animals are present. But richness is accessed by the type of organism that is 3.
In option D- two different types of species are present, that is rat, ant. A total of 7 animals are present. But richness is accessed by the type of organism that is 2.

Thus, the correct answer is option B.

Note:
Species richness is an important aspect of an ecosystem. The more the richness, the more stable the ecosystem will be. It will contribute to higher biodiversity.
Size of the habitat is proportional to the species richness. Greater the size of habitat, greater would be the richness.