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Thorn of Bougainvillea and tendril of Cucurbita are examples of:
A
vestigial organs
B
retrogressive evolution
C
analogous organs
D
homologous organs
Detailed Solution
Homologous organs are organs that have the same basic structure and origin but perform different functions.
The thorn of Bougainvillea and the tendril of Cucurbita both arise in the axillary position and both are modifications of the stem (axillary bud).
The thorn is used for protection, while the tendril is used for climbing.
Since their origin is the same but their functions are different, they are homologous organs.
Homology indicates common ancestry and is the result of divergent evolution.
Analogous organs, in contrast, have different origins but perform similar functions, for example the wings of a butterfly and of a bird.
The thorn of Bougainvillea and the tendril of Cucurbita both arise in the axillary position and both are modifications of the stem (axillary bud).
The thorn is used for protection, while the tendril is used for climbing.
Since their origin is the same but their functions are different, they are homologous organs.
Homology indicates common ancestry and is the result of divergent evolution.
Analogous organs, in contrast, have different origins but perform similar functions, for example the wings of a butterfly and of a bird.