Question

What is the relationship between thorns of Bougainvillea and tendrils of Cucurbita?

Hint:

Homologous organs → Same origin, different function. Analogous organs → Different origin, same function.

Answer 1

Step 1: Concept of homology.
Thorns of Bougainvillea and tendrils of Cucurbita are examples of homologous organs. They are derived from modification of stems but perform different functions.
Step 2: Explanation.
- Bougainvillea thorns = protective function.
- Cucurbita tendrils = climbing support.
Step 3: Conclusion.
Both are homologous organs showing divergent evolution.