example for homologous organs Related: NCERT Solutions - Heredity and Evolution?

Question

example for homologous organs Related:  NCERT Solutions - Heredity and Evolution?

Answer

Forelimbs of Amphibians, Reptiles, Birds and Mammals are the examples for Homologous organs. If you observe the Forelimbs of Amphibians, Reptiles, Birds and Mammals, they have a same structure but different in their origin and functions.

Answer

A) our arm and a dog’s fore-leg.
(b) our teeth and an elephant’s tusks.
(c) potato and runners of grass.

Answer

Examples of homologous organs are the forelimbs of frog, man, and the flippers of the whales. The flippers are used for swimming, the forelimbs of frog are used for jumping and propping, and the forelimbs of man are used for writing, eating, etc.

Answer

Example for homologous organs

Answer

Homologous organs are those organs that have a similar basic structure but may have different functions in different organisms. These organs are considered to be evidence of a common ancestry among different species.

Examples of Homologous Organs:
1. Forelimbs of Mammals:
- The forelimbs of mammals such as humans, cats, bats, and whales have the same basic structure.
- They all have a humerus, radius, and ulna in the upper arm, followed by a set of small bones in the wrist and fingers.
- Despite their different functions (e.g., human hands, bat wings, and whale flippers), the underlying structure remains the same.
- This suggests that these mammals share a common ancestor that had a similar forelimb structure, which has been modified over time to suit different functions.

2. Wings of Birds and Bats:
- The wings of birds and bats are another example of homologous organs.
- Both birds and bats have forelimbs modified into wings for flight.
- The underlying bone structure of their wings is similar, with elongated finger bones supporting a membrane or feathers.
- However, the wings of birds are covered with feathers, while the wings of bats are covered with a thin membrane of skin.
- This similarity in the underlying structure indicates a common ancestor with forelimbs that were eventually modified for flight in different ways.

3. Flippers of Whales and Penguins:
- Flippers of whales and penguins are also homologous organs.
- Both whales and penguins have forelimbs modified into flippers for swimming.
- The bone structure of their flippers is similar, with a shortened humerus, elongated radius and ulna, and fused finger bones.
- Although whales are mammals and penguins are birds, their similar flipper structure suggests a common ancestor that had forelimbs adapted for swimming.

In conclusion, homologous organs provide evidence of common ancestry among different species. Despite having different functions, these organs share a similar basic structure, indicating that they have evolved from a common ancestor over time.

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