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प्रश्न
Write short notes based upon the information known to you.
Darwin’s theory of natural selection
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उत्तर
- Darwin is famous for the theory which he published in the book titled 'Origin of Species'.
- Darwin’s theory of natural selection is based on the concept of survival of the fittest.
- Organisms can reproduce prolifically.
- Under limited resources, organisms compete with each other in a life-threatening manner for their survival.
- According to this theory, only those organisms survive which show modifications for winning the competition. The selected organisms then give rise to new species with their specific set of characters.
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संबंधित प्रश्न
How do the observations made during moth collection in pre- and post- industrialized era in England support evolution by Natural Selection?
Name and define the three types of natural selection.
Give the scientific name of the organism which is cited as the classical example of "natural selection".
Industrial melanism provides a good example of natural selection. Discuss.
Given alongside are two figures (A and B) showing a phenomenon that was first observed in Manchester before and after the year 1850.
Answer the following:
- What name has been given to this phenomenon?
- Give the common name and the scientific name of the insect involved in this phenomenon.
- Briefly mention why the changes shown in the two figures appeared.
- The following phenomenon provides a classical explanation of a scientific theory given by a certain scientist.
- Name and explain the said theory.
- Give the name of the scientist who gave this theory.
Answer the following question.
How did Charles Darwin express 'fitness'?
In which book Darwin had published his theory of Natural selection?
Natural selection is a driving force for evolution-How?
The more characteristics two species have in common ______
Natural selection is called ‘survival of the fittest. Which of the following statements best describes an organism?
What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor?
Study the following cross and showing self pollination in F1, fill in the blank and answer the question that follows
| Parents | RRYY | × | rryy |
| Round, Yellow | wrinkled, green | ||
| F1- | Rr Yy | × | ? |
| Round, yellow |
Theory of natural selection dwells on:
Mention Darwin's observations made on finches during his visit of Galapagos Islands. Write the explanation given by Darwin on his observations.
Distinguish between directional, stabilizing and disruptive selection.
The selective agent that was responsible for causing the change in peppered moth was ______.
Which one of the following was not explained by Darwinism?
Differentiate between Lamarck's Theory and Darwin's Theory.
Define the following term:
Natural selection
