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प्रश्न
Define the following term:
Speciation
उत्तर
The origin of new species by gradual modification is called speciation.
संबंधित प्रश्न
Briefly discuss the Theory of Natural Selection as given by Darwin.
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.
In which book Darwin had published his theory of Natural selection?
The more characteristics two species have in common ______
What is the ancient name for all human beings?
What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor?
Species occurring in the different geographical areas are called as ______.
Match List - I with List - II.
| List - I | List II | ||
| (a) | Adaptive radiation | (i) | Selection of resistant varieties due to excessive use of herbicides and pesticides |
| (b) | Convergent evolution | (ii) | Bones of forelimbs in Man and Whale |
| (c) | Divergent evolution | (iii) | Wings of Butterfly and Bird |
| (d) | Evolution by anthropo- genic action | (iv) | Darwin Finches |
Choose the correct answer from the options given below.
What are the key concepts in the evolution theory of Darwin?
Define the following term:
Natural selection
