NCERT Solutions for Class 8 Science Chapter 9
Important NCERT Questions
8th Chapter 9 Reproduction in Animals
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 9
Differentiate between internal fertilization and external fertilization.
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Differentiate between internal fertilization and external fertilization.
Internal Fertilization:
1 Fusion of male and female gametes take place inside the body.
2 Less numbers of eggs are produced.
3 Examples: Cow, Dog, Human etc.
External Fertilization:
1 Fusion of male and female gametes take place outside the body.
2 Large numbers of eggs are produced.
3 Examples: Frog, Fishes etc.
Internal Fertilization:
1. Location: Occurs within the female’s reproductive tract.
2. Process: Sperm fertilizes the egg inside the female’s body.
3. Common in: Mammals, reptiles, birds, and certain fish.
4. Advantages: Provides protection and a controlled environment for embryo development.
5. Parental Care: Often involves parental care for offspring after birth/hatching.
External Fertilization:
1. Location: Occurs outside the bodies of both sexes, often in water.
2. Process: Eggs and sperm meet in the external environment.
3. Common in: Aquatic organisms like fish, amphibians, and many invertebrates.
4. Challenges: Exposes gametes to environmental risks like predation and unfavorable conditions.
5. Parental Care: Generally limited or absent; offspring survival relies on external factors.
These distinctions highlight how different reproductive strategies suit the needs and environments of various organisms, whether terrestrial or aquatic.