Class 10 Science Biology Heredity and Evolution



An example of homologous organs is
(a)
Our arm and a dog's fore-leg
(b)
Our teeth and an elephant's tusks
(c)
Potato and runners of grass
(d)
All of the above.
Correct answer: (d) 
Solution: A homologous structure is an example of an organ or bone that appears in different animals, underlying anatomical commonalities demonstrating descent from a common ancestor. The arm of a human and the leg of a dog are homologous structures. They are different and have a different purpose, but they are similar and share common traits. Elephants' tusks are specialized incisors for digging food up and fighting. They are homologous structures to human teeth, inherited from a common ancestor with incisor teeth. The corm of colocasia, tuber of potato, and runner of lawn grass are all homologous structures.

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