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प्रश्न
Explain the concept ‘survival of the fittest’.
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उत्तर
Survival of the fittest (Natural selection):
a. The organisms having favourable variations succeed in the struggle for existence.
b. The organisms with unfavourable variations are unfit to survive and they perish.
c. This means survival of the fittest.
d. Nature selects the organisms with favourable variations and these are fittest to survive, hence, the theory is known as Theory of Natural selection.
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संबंधित प्रश्न
With the help of suitable examples, explain why certain traits cannot be passed on to the next generation. What are such traits called?
Give the respective scientific terms used for studying the mechanism by which variations are created and inherited
What is meant by dominant genes and recessive genes? Give one example of each.
Fill in the following blank with suitable word :
The human forelimb and bat's forelimb are an example of .......... organs whereas an insect's wing and a bat's wing are an example of ........... organs.
Scientists believe that all life originated in :
(a) the sea
(b) the soil
(c) the ground
(d) the air
Define Organic evolution.
Name any three types of premating isolating mechanisms.
Which of the following is the correct pair?
Variations during mutations of meiotic recombinations are ______.
Which one of the following was not given by Darwin's theory of evolution?
