Question

Thorn of Bougainvillea and tendril of Cucurbita are examples of

• A.
  vestigial organs
• B.
  analogous organs
• C.
  homologous organs
• D.
  retrogressive evolution

Answer 1

The correct option is C

homologous organs
Thorns of Bougainvillea and tendrils of Cucurbita are examples of homologous organs. They arise from the axillary buds, and they perform different types of functions.
The thorn is for providing protection against the grazing animals.
The tendrils help in providing support while climbing. They are anatomically similar. But the functions are different.

The organs which are similar in appearance and perform the same function but differ in their fundamental structure and origin are called analogous organs. They are a result of convergent evolution.

Vestigial organs are the organs that are still present in the body but do not perform any function. They are also termed as useless organs.

Retrogressive evolution is a process in which complex forms of the organism develop into a simpler form. For example, monocot plants belong to a more advanced group of herbaceous and simple-structured plants.

Therefore , for the given question, the correct answer is option C.