Question

Sol.(b) [Key Concept: Analogous Structures — Prawn Gills & Human Lungs] Gills of Prawn and Lungs of Man are analogous structures — both are respiratory organs (perform the same function of gas exchange) but have entirely different embryonic origins and structures (gills are external/lamellar; lungs are internal/saccular). Gills are not derived from a common ancestor with lungs. Thorns and tendrils of plants are homologous (modified stems). Wings of bat and pigeon are homologous.