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What are vestigial organs? Explain with ...

What are vestigial organs? Explain with an example in digestive system of human body.

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The organs that are present in the rudimentary form and do not perform any significant function in certain organisms, but correspond to fully developed functional organs of other closely related organisms are called vestigial organs.
• These organs were well-developed and functional in their ancestors but became nonfunctional and rudimentary in the present living forms because of change in their mode of life. For example, monkey possesses tail due to its arboreal habitat.
Ancestral man also possessed tail.
Present-day man does not possess fully developed tail. But the rudimentary form of tail is there in the form of a tail bone composed of four fused vertebrae and some muscles attached to that. The presence of this rudimentary tail in man indicates the common ancestry of man and monkey.
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  1. State the similarities and differences between connecting links and mi...

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  2. Distinguish between homologous organs and analogous organs.

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  3. What are connecting links? Explain by taking example of Peripatus.

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  4. What are vestigial organs? Explain with an example in digestive system...

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  5. List out the morphological changes that took place in the course of ev...

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  6. Define the following. Struggle for existence

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  7. Define the following Acquired characters

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  8. Distinguish between gene flow and genetic drift.

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  9. List out the various evolutionary agents as envisaged by the modern th...

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  10. Explain Lamarckism principle of use and dis use with respect to the or...

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  11. What are acquired characters? Give an example.

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  12. Explain the evolution of man.

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  13. Under what conditions, gene migration lead to speciation?

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  14. How did Weismann's germplasm theory disprove Lamarckism?

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  15. Distinguish between the following. Prokaryotes and eukaryotes

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  16. Distinguish between the following. Invertebrates and vertebrates

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  17. Distinguish between the following. Gymnosperms and angiosperms

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  18. Distinguish between the following. Protochordates and vertebrates

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  19. Explain the concept of survival of the fittest.

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  20. What is meant by struggle for existence and survival of the fittest? E...

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