8th Science NCERT Chapter 6
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Important Topics and Summaries:
1. Modes of Reproduction
– Summary: Animals reproduce through two modes: sexual reproduction and asexual reproduction.
2. Sexual Reproduction
– Summary: Similar to plants, animals have male and female reproductive parts that produce gametes which fuse to form a zygote, leading to sexual reproduction.
3. Male Reproductive Organs
– Summary: Male reproductive organs include testes, sperm ducts, and a penis that produce sperms, each containing a head, middle piece, and tail.
4. Female Reproductive Organs
– Summary: Female reproductive organs consist of ovaries, oviducts, and the uterus that produce eggs which, upon fertilization, form a zygote for further development.
5. Fertilisation
– Summary: Fertilisation is the fusion of sperm and egg to form a zygote, occurring internally in the female body in humans and some animals.
6. External Fertilisation
– Summary: In some animals like fish and frogs, fertilisation occurs outside the female body, typically in water, termed external fertilisation.
7. Development of Embryo
– Summary: Following fertilisation, the zygote develops into an embryo which embeds in the uterus, undergoing cell divisions to form different tissues and organs for further growth and development.
These topics cover the essential aspects of reproduction in animals and the processes involved in sexual reproduction.
What are the two modes of reproduction in animals discussed in the chapter?
Describe the male reproductive organs mentioned in the chapter.
Explain the process of fertilisation discussed in the chapter.
What is internal fertilisation, and which animals undergo this process?
Why do fish and frogs lay hundreds of eggs while a hen lays only one egg at a time?
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