Reproduction in Animals - Class 8 - Science
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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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Sign up nowChoose 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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Sign up nowIndicate 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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Sign up nowGive two differences between a zygote and a foetus
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Sign up nowDefine asexual reproduction. Describe two methods of asexual reproduction in animals.
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Sign up nowIn which female reproductive organ does the embryo get embedded?
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Sign up nowWhat is metamorphosis? Give examples.
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Sign up nowDifferentiate between internal fertilisation and external fertilisation
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Sign up nowComplete 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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Sign up nowExtra 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.
Name the tissue which provides sufficient nutrition to the growing baby in the uterus.
A) Nervous
B) Striated
C) Placenta
D) Connective
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Sign up now8
Aquatic animals in which fertilization occurs in water are said to be:
(a) viviparous without fertilization.
(b) oviparous with external fertilization.
(c) viviparous with internal fertilization.
(d) oviparous with internal fertilization.
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Sign up nowThe process of injecting sperm into the female artificially is called:
A. artificial insemination B. fertilization C. cloning D. embryo transfer
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Sign up nowLong 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.
Explain the structure and functioning of male and female reproductive organs in animals.
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Sign up nowWhy do not all eggs in fish and frogs get fertilised and develop into new individuals? Discuss the challenges faced by these embryos.
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Sign up nowShort 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.
What are the male and female reproductive parts in animals called and what role do they play in reproduction?
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Sign up nowWhat is the process through which amoeba reproduces?
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