What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor?
Homologous structures are those which have common ancestors, similar basic structure, similar topographic relationships and have similar origin but perform different functions are homologous organs also known as divergent evolution.
Eg. Forelimbs of vertebrates like, cheetah, whale, bat. Yes, it is necessary that homologous structures always have common ancestors because if they have different ancestors then they are known as Analogous structure or convergent evolution.
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
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Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 32: What are homologous structures? Give an example. Is it necessary that homologous structures always h....
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