Modes of Reproduction in Animals - DPS GUWAHATI



Class VIIIName of Chapter: Microorganisms: Friend and Foe(35 mins)Week : 23rd - 28th November 2020Period 1: REVISIONStep – IStudy the following topic from textbook:REVISIONStep – IIStudy the same topic in the following part of DIKSHA app:Ch – Microorganisms: Friend and Foe (Video) Step – IIIIf you have any doubts clear them with your subject teacher (please check name and number of the subject from the school website)Step – IVRevision may be done from DIKSHA appChapter: Microorganisms: Friend and Foe Practice ItemsStep – VTo practice Revision questions at home.End of Day – 1Period 2:Chapter 9: Reproduction in AnimalsPg: 100-101 Step – IStudy the following topic from textbook:Introduction9.1: Modes of Reproduction9.2: Sexual reproductionStep – IIStudy the same topic in the following part of DIKSHA app:Ch – Reproduction In Animals (Explanation Content) Step – IIIIf you have any doubts clear them with your subject teacher (please check name and number of the subject from the school website)Step – IVBullet points:Reproduction:Reproduction is the process of giving rise to new individuals of the same species.Reproduction is essential for the continuation of a species.Offspring:The young one of an animal is called its offspring.Modes of Reproduction in AnimalsThere are two modes of reproduction in animals:Sexual ReproductionAsexual ReproductionSimilarities between Reproduction in Plants and AnimalsPlants and animals can both undergo the sexual and asexual process of reproduction.Just like plants, in animals, the males and females have different reproductive organs.In both the plants and animals, the zygote is formed when the male and female gametes fuse together and hence the zygote develops into a new individual.Sexual ReproductionThe type of reproduction that begins with the fusion of male and female gametes is called?Sexual Reproduction.Male reproductive organs:The male reproductive organs include:pair of testes (singular, testis), two sperm ducts anda penis Sperms:The testes produce the male gametes called sperms. Millions of sperms are produced by the testes.Sperms are very small in size.Each sperm has a head, a middle piece and a tail.Each sperm is a single cell.Step – VQuestion Answers to be written in Bio copy:Explain the importance of reproduction in organisms.Ans: Reproduction is a vital phenomenon on this planet earth which is essential for existence and continuity of life and species on it, generation after generation.Draw the structure of Human sperm.Ans: refer fig:9.2 of Pg 101of the NCERT science bookWhat purpose does the tail in a sperm serve?Ans: It allows the sperm cell to travel at a fast pace in order to move towards the female gamete.Sperms are :Male gametes b) single celled c) reproductive cell d) All of theseEnd of Day – 2 ................
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