NCERT Solution for Class 10 Science Chapter 9
Heredity and Evolution
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-158
Questions No-1
Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?
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A species is a group of organisms that are capable of interbreeding to produce a fertile
offspring. Skin colour, looks, and size are all variety of features present in human beings.
These features are generally environmentally controlled. Various human races are formed
based on these features. However, there is no biological basis to this concept of races.
Therefore, all human beings are a single species as humans of different colour, size, and
looks are capable of reproduction and can produce a fertile offspring.
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In spite of wide differences in size, colour and looks, human beings can interbreed. Hence, all of them are kept under one species.
Species is defined as group of individuals that can interbreed. All human beings are Homo sapiens and are capable of interbreeding inspite of some differences. Thus they are said to belong to same species