Example 2: Thorn and tendrils in plants: The thorn in bougainvillea and tendril in passion flower are the homologous organ in the plants. They looks different and help the plant in climbing but both arises from the axillary position and are modified branches (Figure 5.3).

Figure 5.3 : Thorn/tendrils in plant.

C. Analogous Organs: The organs which perform same function and looks similar but are quite different in their structure. These organs are called as analogous organs. Analogy is based on the convergent evolution. Few Examples of analogous organs are as follows:

Example 1: Insect and bord wings: The wings of bord and insect are the analogous organ (Figure 5.4). In both organism, these organs are used to fly in air but they are different in structure. Insect wings is an extension of the integument whereas bird wing is formed of limb bones covered with flesh, skin and feathers.