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प्रश्न
What do you understand by the term 'evolution'?
उत्तर
Evolution is the sequence of gradual changes which take place in the primitive organisms over millions of years, during which new species are produced.
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संबंधित प्रश्न
Planaria, insects, octopus and vertebrates all have eyes. Can we group eyes of these animals together to establish a common evolutionary origin? Justify your answer.
What evidence do we have for the origin of life from inanimate matter?
Where did life originate on the earth?
Write the names of at least three inorganic molecules which helped in the origin of life on the earth.
Fill in the following blank with suitable word :
The evolution of eye is an example of evolution by ............
Fill in the following blank with suitable word :
The theory of natural selection for evolution was proposed by ..............
Name the scientist who gave the theory of origin of life on earth. What is this theory?
State Darwin's theory of evolution.
Select the incorrect statement from the following :
(a) frequency of certain genes in a population changes over several generations resulting in evolution
(b) reduction in the weight of an organism due to starvation is genetically controlled
(c) low weight parents can have heavy weight progeny
(d) traits which are not inherited over generations do not cause evolution.
In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.
