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CBSE NOTES ⇒ Class 10th ⇒ Science ⇒ 9. Heredity and Evolution

9. Heredity and Evolution

page 4

1. Homologous Organs: Those organs in the various organisms which have same structure and origin and different functions are called homologous organs. 

Example : Fore limb of frogs, feather of birds, Fore limb of horse are same originated but have difference functions. 

2. Analogous Organs: Those organs of various organisms which have same function and but have different in oriigin are called analogous organs. 

Example : wings of butterfly and wings of birds have same functions but differ in origin.

3. Fossils: The preservative traces of dead organnisms are called fossils. 

Example: If a dead insect gets caught in hot mud, for example, it will
not decompose quickly, and the mud will eventually harden and retain
the impression of the body parts of the insect. 

Some Examples of obtain fossils: 

(1) Fossil - tree trunk

(2) Fossil - invertebrate (Ammonite)

(3) Fossil - invertibrate (Trilobite)

(4) Fossil - fish (Knightia)

(5) Fossil - dinosaur skull (Rajasaurus)

Fossils also provide evidence  

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Study Materials List:

CBSE NOTES ⇒ Class 10th ⇒ Science
1. Chemical Reactions and Equations
2. Acids, Bases and Salts
3. Metals and Non-metals
4. Carbon and its Compounds
5. Periodic Classification of Elements
6. Life Processes
7. Control and Coordination
8. How do Organisms Reproduce
9. Heredity and Evolution
10. Light-Reflection and Refraction
11. Human Eye and Colourful World
12. Electricity
13. Magnetic Effects of Electric Current
14. Sources of Energy
15. Our Environment
16. Management of Natural Resources

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