Question

Four students P, Q, R and S were asked to do the labeling for the parts A, B, C, D and E of hydra shown in the figure alongside. They all submitted their answers as given below. Which of the four students done the labeling correctly? *
Capti​

Answer 1

Answer:

Out of the four students, R and S are correct as they indicate true pairs of analogous organs. Analogous organs are those which have same function but differ in embryonic origin. Wings of parrot and butterfly both are used for flying but those of parrot are modified feathers while that of butterfly are formed of thin membranous layers of chitin. Similarly wings of bat are made of thin layers of stretched skin but perform flying function. The other sets of pairs given by students P and Q are homologous organs as all have same structure but different way of locomotion.