Reproduction in Animals - Class 8 Science - Chapter 6 - Notes, NCERT Solutions & Extra Questions
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Notes - Reproduction in Animals | Class 8 NCERT | Science
Comprehensive Guide to Reproduction in Animals: Class 8 Notes
Understanding Reproduction in Animals
Reproduction is a fundamental biological process essential for the survival and continuation of species. It ensures the generation of new individuals, maintaining the population of a species over time.
Modes of Reproduction
Animals reproduce via two primary modes: sexual reproduction and asexual reproduction.
Sexual Reproduction
Sexual reproduction involves the fusion of male and female gametes, resulting in the formation of a zygote. This zygote develops into a new individual. Both male and female animals have specialized reproductive organs to facilitate this process.
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Notes - Flashcards - Reproduction in Animals | Class 8 NCERT | Science
Back Questions - Reproduction in Animals | NCERT | Science | Class 8
Explain the importance of reproduction in organisms.
Reproduction is a fundamental process in nature that plays an important role in the continuation of species. Without it, any species would cease to exist over time. Reproduction involves the creation of new individuals, ensuring a flow of genetic information to the next generation. It is interesting that the offspring, though similar, are not identical to their parents, accounting for biological diversity. In addition, reproduction contributes to the process of evolution by allowing beneficial traits to be passed down, thus promoting the survival of the species. Importantly, reproduction in animals involves complex systems and hormones that contribute to the overall health, well-being, and life span of an individual.
Describe the process of fertilisation in human beings
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Choose the most appropriate answer.
(a) Internal fertilisation occurs
(i) in female body.
(ii) outside female body.
(iii) in male body.
(iv) outside male body.
(b) A tadpole develops into an adult frog by the process of
(i) fertilisation (ii) metamorphosis (iii) embedding (iv) budding
(c) The number of nuclei present in a zygote is
(i) none (ii) one (iii) two (iv) four
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Indicate whether the following statements are True (T) or False (F).
(a) Oviparous animals give birth to young ones. ( )
(b) Each sperm is a single cell. ( )
(c) External fertilisation takes place in frog. ( )
(d) A new human individual develops from a cell called gamete. ( )
(e) Egg laid after fertilisation is made up of a single cell. ( )
(f) Amoeba reproduces by budding. ( )
(g) Fertilisation is necessary even in asexual reproduction. ( )
(h) Binary fission is a method of asexual reproduction. ( )
(i) A zygote is formed as a result of fertilisation. ( )
(j) An embryo is made up of a single cell. ( )
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Give two differences between a zygote and a foetus
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Define asexual reproduction. Describe two methods of asexual reproduction in animals.
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In which female reproductive organ does the embryo get embedded?
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What is metamorphosis? Give examples.
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Differentiate between internal fertilisation and external fertilisation
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Complete the crossword puzzle using the hints given below.
Across
1. The process of the fusion of the gametes.
6. The type of fertilisation in hen.
7. The term used for bulges observed on the sides of the body of hydra.
8. Eggs are produced here.
Down
2. Sperms are produced in these male reproductive organs.
3. Another term for in vitro fertilisation.
4. These animals lay eggs.
5. A type of fission in amoeba.
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Ask Chatterbot AIShort Questions - Reproduction in Animals | NCERT | Science | Class 8
What are the two modes through which animals reproduce?
The two modes through which animals reproduce are sexual reproduction and asexual reproduction.
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What is the life cycle of a frog?
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Ask Chatterbot AILong Questions - Reproduction in Animals | NCERT | Science | Class 8
Discuss the two modes of reproduction in animals with reference to internal and external fertilisation. Also, provide examples of animals that reproduce through each mode.
Animals reproduce through two primary modes: sexual reproduction and asexual reproduction. In sexual reproduction, internal fertilisation is commonly observed where the male and female gametes fuse within the female's body. This process leads to the formation of a zygote, which develops into a new individual. Examples include humans, cows, and dogs.
In contrast, external fertilisation occurs mostly in aquatic animals such as fish and frogs, which is a feature of sexual reproduction. This involves the female laying eggs in water, which the male then fertilises by depositing sperm over them. Thus, unlike internal fertilisation, this process occurs outside the female's body.
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What is the significance of the term "test-tube baby" and why is it misleading? Discuss the process of in vitro fertilisation.
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Ask Chatterbot AIExtra Questions - Reproduction in Animals | NCERT | Science | Class 8
Which of the following organisms shows metamorphosis?
A. Crocodile
B. Hen
C. Silk moth
D. Elephant
The correct answer is C: Silk moth.
Metamorphosis is a biological process in which animals undergo significant physical changes after birth or hatching, often resulting in a change in form or structure as they develop from larvae or juveniles to adults. This process is characteristic of insects and amphibians.
A silk moth undergoes this transformative process. Initially, the silk moth starts as an egg, and upon hatching, it emerges as a larva, commonly known as a caterpillar, which significantly differs in appearance from the adult moth. Through the stages of metamorphosis, which include larval, pupal, and adult stages, the organism transforms until it reaches its adult form that resembles its species. Thus, out of the given options, the silk moth is the correct organism that shows metamorphosis.
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In a zoo, there are rabbits and pigeons. If heads are counted, there are 340 heads, and if legs are counted, there are 1060 legs. How many pigeons are there?
A) 120 B) 150 C) $\mathbf{180}$ D) 210 E) none
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Regarding assertion and reason, select the correct option. Assertion (A): Certain species are highly territorial in nature. Reason (R): Species that are territorial in nature are always large.
A) Both A and R are correct and R explains A.
B) Both A and R are correct and R does not explain A.
C) A is correct and R is incorrect.
D) Both A and R are incorrect.
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