BIOLOGY- REPRODUCTION IN ORGANISM Part 4<\/p>\n
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Reproduction is a biological process by which organisms produce their offspring. It ensures the continuity of species.<\/p>\n
Sexual reproduction involves the fusion of male and female gametes (sperm and egg) to form a zygote, which develops into a new organism.<\/p>\n
Pre-fertilization Events:<\/strong><\/p>\n Fertilization (Syngamy):<\/strong><\/p>\n Post-fertilization Events:<\/strong><\/p>\n \u0905\u0917\u0930 \u0906\u092a\u0915\u094b \u0915\u093f\u0938\u0940 \u0914\u0930 \u091f\u0949\u092a\u093f\u0915 \u092f\u093e \u0921\u093f\u091f\u0947\u0932\u094d\u0938 \u092e\u0947\u0902 \u091c\u093e\u0928\u093e \u0939\u0948 \u0924\u094b \u092c\u0924\u093e\u0907\u090f!<\/p>\n Here is Part 4<\/strong> of the Biology \u2013 Reproduction in Organisms<\/strong> chapter, based on NCERT Class 12 syllabus and general biology topics:<\/p>\n Topic: Reproductive Structures and Events in Sexual Reproduction<\/strong><\/p>\n Sexual reproduction involves the fusion of male and female gametes<\/strong> (haploid) to form a zygote<\/strong> (diploid), which develops into a new organism.<\/p>\n Pre-fertilization Events<\/strong><\/p>\n<\/li>\n Fertilization<\/strong><\/p>\n<\/li>\n Post-fertilization Events<\/strong><\/p>\n<\/li>\n<\/ol>\n These events happen before fertilization<\/strong> and include:<\/p>\n Male gamete:<\/strong> Sperm (in animals), Pollen (in plants)<\/p>\n<\/li>\n Female gamete:<\/strong> Ovum (in animals), Egg cell (in plants)<\/p>\n<\/li>\n<\/ul>\n Isogametes<\/strong> \u2013 morphologically similar (e.g., algae)<\/p>\n<\/li>\n Anisogametes<\/strong> \u2013 morphologically different (e.g., human)<\/p>\n<\/li>\n<\/ul>\n In animals: Male delivers sperm to the female via copulation (internal) or external release (in aquatic species).<\/p>\n<\/li>\n In plants: Pollen grain is transferred to stigma (pollination).<\/p>\n<\/li>\n<\/ul>\n It is the process of fusion of male and female gametes<\/strong> to form a zygote<\/strong>.<\/p>\n<\/li>\n Types:<\/strong><\/p>\n External Fertilization<\/strong> \u2013 outside the body (e.g., frog, fish)<\/p>\n<\/li>\n Internal Fertilization<\/strong> \u2013 inside the body (e.g., humans, birds)<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n Restores diploid number.<\/p>\n<\/li>\n Initiates development of the new organism.<\/p>\n<\/li>\n<\/ul>\n Zygote is diploid (2n)<\/strong> and develops into an embryo.<\/p>\n<\/li>\n In higher organisms, zygote undergoes mitosis.<\/p>\n<\/li>\n<\/ul>\n Cell division (cleavage)<\/strong> and cell differentiation<\/strong> occur.<\/p>\n<\/li>\n In animals:<\/p>\n Oviparous:<\/strong> Lay eggs (e.g., birds, reptiles)<\/p>\n<\/li>\n Viviparous:<\/strong> Give birth to young ones (e.g., mammals)<\/p>\n<\/li>\n<\/ul>\n<\/li>\n In plants:<\/p>\n Zygote remains in ovule \u2192 develops into embryo<\/p>\n<\/li>\n Ovule becomes seed<\/strong>, and ovary becomes fruit<\/strong><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n
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3. Types of Organisms Based on Reproduction:<\/strong><\/h3>\n
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4. Importance of Sexual Reproduction:<\/strong><\/h3>\n
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5. Examples of Sexual Reproduction:<\/strong><\/h3>\n
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\u00a0Quick Quiz:<\/strong><\/h4>\n
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BIOLOGY- REPRODUCTION IN ORGANISM Part 4<\/a><\/h3>\n
CHAPTER – How do Organisms Reproduce?<\/a><\/h3>\n
Reproduction-in-organisms.pdf<\/a><\/h3>\n
NCERT-Class-12-Biology.pdf<\/a><\/h3>\n
REPRODUCTION AND POPULATION CONTROL<\/a><\/h3>\n
\n\ud83e\uddec Biology \u2013 Reproduction in Organisms (Part 4)<\/strong><\/h2>\n
\n\ud83d\udd39 1. Overview of Sexual Reproduction<\/strong><\/h2>\n
\u2733\ufe0f It occurs in three phases:<\/h3>\n
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\n\ud83d\udd38 2. Pre-fertilization Events<\/strong><\/h2>\n
\u2705 (a) Gametogenesis<\/strong> \u2013 Formation of gametes<\/h3>\n
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\ud83d\udc49 Types of gametes:<\/h4>\n
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\n\u2705 (b) Gamete Transfer<\/strong><\/h3>\n
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\n\ud83d\udd38 3. Fertilization (Syngamy)<\/strong><\/h2>\n
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\ud83c\udf1f Importance:<\/h3>\n
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\n\ud83d\udd38 4. Post-fertilization Events<\/strong><\/h2>\n
\u2705 (a) Zygote Formation<\/strong><\/h3>\n
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\u2705 (b) Embryogenesis<\/strong> \u2013 Development of embryo<\/h3>\n
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\n\ud83d\udccc Summary Table:<\/h2>\n