NCERT Solutions Class 8 Science Chapter 9 Reproduction in Animals – Here are all the NCERT solutions for Class 8 Science Chapter 9. This solution contains questions, answers, images, explanations of the complete chapter 9 titled Reproduction in Animals From of Science taught in class 8. If you are a student of class 8 who is using NCERT Textbook to study Science, then you must come across chapter 9 Reproduction in Animals . After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals in one place.
NCERT Solutions Class 8 Science Chapter 9 Reproduction In Animals
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Reproduction In Animals
NCERT Solutions Class 8 Science chapter 9 Reproduction In Animals
Class 8, Science chapter 9, Reproduction In Animals solutions are given below in PDF format. You can view them online or download PDF file for future use.
Reproduction In Animals
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Question & Answer
Q.1: Explain the importance of reproduction in organisms.
Ans : 1. Reproduction is essential for the continuation of a species. 2. It ensures the continuation of similar kinds of individuals, generation after generation.
Q.2: Describe the process of fertilisation in human beings
Ans : There is sexual reproduction in human beings. Male reproductive organs produce sperms (male gametes) while the female gametes produce ova (female gametes). The sperms are ejected inside female bodies where they fuse with ovum and forms zygote(called internal fertilization). The single celled zygote begins to develop into an embryo which attaches to the female uterus wall. The embryo further multiples into many cells and develops further into a small baby called foetus.
Q.3: 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
Ans : (a) (i) in female body (b) (ii) metamorphosis. (c) (iii) two (fused nuclei)
Q.4: 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.( )
Ans : (a) Oviparous animals give birth to young ones...............(F) (b) Each sperm is a single cell..................................................(T) (c) External fertilization takes place in frog.................................(T) (d) A new human individual develops from a cell called gamete...(F) (e) Egg laid after fertilization is made up of a single cell..............(T) (f) Amoeba reproduces by budding............................................(F) (g) Fertilization is necessary even in asexual reproduction............(F) (h) Binary fission is a method of asexual reproduction..................(T) (i) A zygote is formed as a result of fertilization...........................(T) (j) An embryo is made up of a single cell....................................(F)
Q.5: Define asexual reproduction. Describe two methods of asexual reproduction in animals.
Ans : Asexual reproduction is a mode of reproduction in which only one parent is involved to reproduce offspring. In asexual reproduction, the offsprings produced are exact copies of their parents. It is generally observed in very small sized organisms. Binary fission, Budding, Fragmentation etc.are the examples of asexual reproduction. 1. Budding: In this mode, a part of the organism starts bulging out. Slowly it grows and develops into a separate individual. Examples: Hydra, yeast. 2. Binary Fission: It is a type of asexual reproduction in which a single cell divides into two halves. Organisms that reproduce through binary fission are bacteria and Amoeba.
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