Tendrils of Cucurbita and thorns of Bougainvillea are

Homologous organs

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Analogous organs

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Vestigial organs

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Atavistic divergence

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Solution

The correct option is A Homologous organs
Tendrils of Cucurbita and thorns of Bougainvillea are homologous organs. These are altered branches and are axillary in position. It implies axillary branches in Bougainvillea are changed into thistles for assurance from tunnelling creatures and in Cucurbita into rings for climbing.
So, the correct option is 'Homologous organs'.

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