EvolutionMedium
Question
Thorn of Bougainvillea and tendril of Cucurbita are example of
Options
A.analogous organs
B.homologous organs
C.vestigial organs
D.retrogressive evolution
Solution
Thorn of Bougainvillea and tendril of Cucurbita are homologous organs. These modified branches and are axillary in position. It means axillary branches in Bougainvillea are modified into thorns for protection from burrowing animals and in Cucurbita into tendrils for climbing.
The analogous organs have almost similar appearance and perform the same function but these develop in totally different groups and are totally different in their structure and developmental origin. The phyllode of Ruscus or cladode of Asparagus are analogous to leavs of other plants.
The vesigial or rudimentary organs were useless remnants of structure or organs, which might have been large and functional in anacestors, eg, cutin covered stomata on the stem of cacti plants.
The analogous organs have almost similar appearance and perform the same function but these develop in totally different groups and are totally different in their structure and developmental origin. The phyllode of Ruscus or cladode of Asparagus are analogous to leavs of other plants.
The vesigial or rudimentary organs were useless remnants of structure or organs, which might have been large and functional in anacestors, eg, cutin covered stomata on the stem of cacti plants.
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