To evolutionary theorists, a species is a fundamental unit, and transitions between species mark the flow of evolution. But in fact, scientists and philosophers have debated for centuries the ...

A gene is a fundamental unit of heredity, consisting of a specific sequence of DNA that encodes the instructions for making a particular protein or set of proteins. Genes are passed down from parents ...

The CBSE section of Jagran Josh has come up with chapter-wise test series of Science for students of Class 9th. This test series consist of MCQs questions for Science. All the questions are framed ...