Homology and Analogy
1)What are homologous organs?

2)What are analogous organs?

3)Organs such as bat's wing, wings of birds, seal's flipper, forelimb of a horse, and human arm have a common underlying anatomy which was present in their last common ancestor, therefore, their forelimbs are _______________ organs.

4)The bones, humerus and radius ulna are present in the flipper of whale and the forelimb of a rabbit. What does this indicate?

5)Tendril of pea is a modified leaf and is used for providing mechanical support for the plant. But in the case of barberry the modified leaves are meant for protection. Which kind of organs do these leaves represent?

6)Which group of the following contains homologous forelimbs?

7)The phylloclade of Opuntia plant is a _____________________.

8)The potato and sweet potato show similar characteristics, but different origins. What does this indicate?

9)The wings of insects originate from inner or outer surface of the insects body. Feathers of birds originated from forelimbs and wings of bats originated from both fore limb and membranous skin of the abdomen. Which of the following statements is true regarding the wings of the given specimen?

10)Potato is a modified stem, whereas sweet potato is a modified root. Why are they called analogous structures?


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