8th Class Biology
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Consequences of Deforestation
When forests are cut down, it does not affect only trees. It affects climate, soil, water,…
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Deforestation and Its Causes
What is Deforestation? Deforestation means cutting down forests and using that land for other purposes. Forests…
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CONSERVATION OF PLANTS AND ANIMALS
Introduction: Have you ever wondered why places like national parks, wildlife sanctuaries, and biosphere reserves are…
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Reproductive Health
What is Reproductive Health? Health means the physical and mental well-being of a person. During adolescence,…
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Role of Hormones in Completing the Life History of Insects and Frogs
Hormones not only control human growth — they also control life cycle changes in animals, especially…
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Hormones Other than Sex Hormones
Besides sex hormones, our body has many other hormones that control growth, metabolism, stress, and body…
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How is the Sex of the Baby Determined?
The sex (boy or girl) of a baby is decided at the moment of fertilisation. The…
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Reproductive Phase of Life in Humans
When Does Reproductive Life Begin? Adolescents become capable of reproduction when: This usually begins at puberty.…
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Role of Hormones in Initiating Reproductive Function
What Do Endocrine Glands Do? Endocrine glands are ductless glands that release hormones directly into the…
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Secondary Sexual Characters
What are Secondary Sexual Characters? You already know: During puberty, some new physical features appear that…
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