Lesson Notes By Weeks and Term v4 - JHS 1
LIFE CYCLE OF ORGANISMS
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LIFE CYCLE OF ORGANISMS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Science
Class: JHS 1
Term: 1st Term
Week: 9
Grade code: B7.2.2.1.2
Strand code: 2
Sub-strand code: 2
Content standard code: B7.2.2.1
Indicator code: B7.2.2.1.2
Theme: CYCLES
Subtheme: LIFE CYCLE OF ORGANISMS
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In Ghana, houseflies are common around homes, markets, chop bars, refuse dumps, public toilets, gutters and animal pens. They move between filth (faeces, rotten food, dead animals) and our food, water and cooking surfaces. Because of this, houseflies can spread diseases such as diarrhoea and dysentery, cause food poisoning, and create nuisance in the environment. Understanding the *activities* of the housefly helps learners protect themselves, their families and their community.
A. Key Terms Housefly (Musca domestica): A common insect found around human settlements. Activity (in this lesson): What the housefly does daily—feeding, moving, resting, breeding, and interacting with the environment. Vector: An organism that carries disease-causing germs from one place to another (housefly is a *mechanical vector*). Pathogens (germs): Microorganisms that cause disease (bacteria, viruses, protozoa). Contamination: When food or water becomes dirty/unsafe due to germs or harmful substances. Food poisoning: Illness caused by eating food contaminated with germs or their toxins.
B. Housefly Feeding Habits (What they feed on) Houseflies are not picky. They feed on: Dead animals (e.g., dead rat, dead chicken) Rotten food (spoilt kenkey, rotten fruits, leftover rice) Manure and faeces (human faeces, animal droppings) Solid waste (refuse dumps, gutters) Liquid waste (dirty water around drains, leaking sewage)
Why this matters: These places contain many germs. When the fly later lands on our food, it can leave germs behind.
C. How Houseflies Feed (Step-by-step) Houseflies have sponging mouthparts. They cannot chew solid food like humans.