Question

Define the Theory of Class 12th Biology



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Answer 1

Hint: The phenomenon that is responsible for the generation of new species or helps the fittest species to survive. It is said to be the result of various factors involved like environment, accumulation of genetic variation, etc. Complete answer: ... That's why this theory is also known as the survival of fittest.

Answer 2

Evolution

Evolution is the study of the different forms of life, its characteristics and the changes over several generations. It is the scientific theory used by biologists to study the genetic variation in a population.

(There are many theories about how life originated on the planet earth. The theory of evolution is based on the idea that all species are correlated and progressively varies with time.)

Darwin Theory about Evolution

Charles Robert Darwin, an English naturalist, geologist, and biologist, is well known for his theory of evolution and the process of natural selection. He gave the theory of evolution, which is known as ‘Darwin’s theory of natural selection’ and also published a book, on “Origin of Species by Natural Selection”.

According to Darwin’s Theory, the main features of this theory are as follows,

1. All organisms reproduce and multiply enormously.
2. No two individuals are alike. They are different from each other either in their size, shape, behavior, etc.
3. Some traits are consistently passed on from their parent to the offspring.
4. The rate of reproduction varies in all living species. Some reproduce more and some minimum.

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