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Are the thorns of Bougainvillea and tend...

Are the thorns of Bougainvillea and tendril of Cucurbita homologous or analogous ? What type of evolution has brought such a similarity in them ?

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Thorns of Bougainvillea and tendrils of Curcurbita are homologous organs as both are modified stem branches and are axillary in position. These represent divergent evolution.
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