Mathematics Grade 9 Zambia

Mathematics Grade 9 Zambia 

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The Female Reproductive System

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  THE FEMALE REPRODUCTIVE SYSTEM  Q-1: Identify parts labeled 1, 2, 3, 4, 5 and 6 above. Oviduct or fallopian tube Ovary Uterus  Endometrium Cervix Vagina Q-2: What are the functions of Oviduct, Ovary, Uterus, Cervix, Vagina and Endometrium? Oviduct (Fallopian Tube) : Site for fertilization Transports ovum(eggs) from ovary to uterus Ovary : Produces ova(egg) Produces female sex hormones Uterus : Supports fetal development Contracts during childbirth Sheds lining during menstruation Endometrium : Lines the uterus Thickens during menstrual cycle Sheds during menstruation For fertilized egg implantation Cervix : Produces mucus Passage for sperm to enter uterus during intercourse  Dilates during childbirth Vagina : Receives penis during intercourse Serves as birth canal (Passage for a baby during birth) Study the diagram below:   Female Reproductive System Other Questions: Q-3: What are the functions of Rectum, Anus and Urinary bladder? Digestive Organs Rectum : Sto...
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Fertilization and embryo development

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Fertilization and embryo development  What is fertilization in humans? Answer: Combining of sperm and ovum nuclei. Where does fertilization typically occur? Answer: In the oviducts. What happens to unused sperm cells? Answer: They remain outside the ovum. What is the result of fertilization? Answer: Formation of a zygote. What is an embryo? Answer: Early stage of development before main body structures form. How long does the embryonic stage last? Answer: Until the end of the eighth week of pregnancy. What is the cell membrane? Answer: A thin layer on the outside of a cell. What is a zygote? Answer: A cell formed by combining sperm and ovum(egg) nuclei. What happens to the zygote as it moves along the oviduct? Answer: It divides to form 2, 4, 8, 16, ... cells. How long does it take for the zygote to develop into a hollow ball of cells? Answer: Between three and seven days. Where does the hollow ball of cells eventually reach and enter? Answer: The uterus. What happens if the hollow...
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Laws of Indices and Square Numbers

  Laws of Indices and Square Numbers Laws of Indices Indices are used to show that a number is being multiplied by itself. For example: 2³ means 2 × 2 × 2 3² means 3 × 3 The laws of indices are used to simplify expressions that involve indices. Positive Indices A positive index shows that a number is being multiplied by itself. For example: 2³ = 2 × 2 × 2 = 8 3² = 3 × 3 = 9 Zero Indices Any number with a zero index is equal to 1. For example: 2⁰ = 1 3⁰ = 1 Laws of Indices There are several laws of indices that can be used to simplify expressions: Multiplication Law : aᵐ × aⁿ = aᵐ⁺ⁿ Division Law : aᵐ ÷ aⁿ = aᵐ⁻ⁿ Power Law : (aᵐ)ⁿ = aᵐ×ⁿ Applying the Laws of Indices Using the laws of indices, we can simplify expressions such as: 2³ × 2² = 2³⁺² = 2⁵ 3² ÷ 3¹ = 3²⁻¹ = 3¹ (2²)³ = 2²×³ = 2⁶ Here is the revised text: Laws of Indices Multiplication Law When multiplying powers with the same base, add the exponents. aᵐ × aⁿ = aᵐ⁺ⁿ Examples 2³ × 2⁵ = 2³⁺⁵ = 2⁸ 3² × 3⁴ = 3²⁺⁴ = 3⁶ Division Law ...
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