Question

Give an example of homologous organ from the plant kingdom.

Answer 1

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Scale leaves of onion and Spines of Opuntia, both are modifications of leaves but functionally and structurally, differ from each other. 
Thorns of Carissa and tendrils of Vitis, both develop from terminal bud in these two different plants but they are meant to perform different functions. 

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Answer 2

Give an example of homologous organ from the plant kingdom.