JAMB CBT PRACTICE TEST

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BIOLOGY LESSON NOTE ON HUMAN KIDNEY

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Lesson Note on the Human Kidney Topic: The Human Kidney Duration: 40 minutes Specific Objectives: By the end of the lesson, students should be able to: Define the kidney and state its location in the human body. Identify and describe the structure and functions of the kidney. Explain the processes involved in urine formation (filtration, reabsorption, and secretion). Describe how the kidney contributes to homeostasis. Identify common kidney-related diseases and how to prevent them. Evaluate the importance of maintaining kidney health. Lesson Content: 1. Introduction to the Human Kidney The kidneys are vital organs in the human body responsible for filtering waste from the blood and regulating water and electrolyte balance. They are part of the excretory system and play a crucial role in homeostasis. Location: The kidneys are located in the abdominal cavity, on either side of the spine, just below the rib cage. Each kidney is bean-shaped and about the size of a fi...
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BASIC SCIENCE LESSON NOTE ON MAGNETISM (JSS2 SECOND TERM LESSON NOTE)

Class

JSS2

Term

Second Term

Week

Week 6

Topic

Magnetism

Duration

40 Minutes

Instructional Materials

  • Bar magnet
  • Horseshoe magnet
  • Iron nails
  • Steel pins
  • Compass
  • Iron filings
  • Paper sheets
  • Charts showing magnetic fields
  • Demonstration board

Reference Books

  1. NERDC Basic Science Curriculum for JSS
  2. STAN Basic Science for Junior Secondary Schools
  3. Evans Basic Science for Junior Secondary Schools
  4. Comprehensive Basic Science by A.O. Ogunniyi

Specific Objectives

At the end of the lesson, students should be able to:

  1. Define magnetism.
  2. Identify magnetic and non-magnetic materials.
  3. State the properties of magnets.
  4. Explain magnetic fields.
  5. Demonstrate attraction and repulsion of magnets.
  6. State uses of magnets.
  7. Explain how to make a simple magnet.

Introduction

Magnets are very useful objects in our daily life. They are used in compasses, electric motors, speakers, and many other devices.

A magnet has the ability to attract certain materials such as iron and steel. This property is called magnetism.

Meaning of Magnetism

Magnetism is the force of attraction or repulsion produced by a magnet.

It is the property that enables a magnet to attract magnetic materials.

Magnetic and Non-Magnetic Materials

Magnetic Materials

These are materials that are attracted by magnets.

Examples:

  • Iron
  • Steel
  • Nickel
  • Cobalt

Non-Magnetic Materials

These are materials that are not attracted by magnets.

Examples:

  • Wood
  • Plastic
  • Glass
  • Rubber
  • Paper

Types of Magnets

1. Natural Magnets

These occur naturally in nature.

Example:

  • Lodestone

2. Artificial Magnets

These are man-made magnets.

Examples:

  • Bar magnet
  • Horseshoe magnet
  • Ring magnet

Properties of Magnets

  1. Magnets attract magnetic materials.
  2. Magnets have two poles: North and South.
  3. Like poles repel.
  4. Unlike poles attract.
  5. Magnetic force is strongest at the poles.
  6. A freely suspended magnet points north-south direction.

Magnetic Poles

Every magnet has two poles:

  • North Pole (N)
  • South Pole (S)

Interaction of Poles

  • North attracts South
  • South attracts North
  • North repels North
  • South repels South

Magnetic Field

A magnetic field is the region around a magnet where magnetic force is experienced.

Magnetic Field Lines

  • They show direction of magnetic force
  • They move from North to South
  • They never cross each other
  • They are closest at the poles (strongest region)

Methods of Making Magnets

1. Stroking Method

Rubbing a material with a magnet repeatedly in one direction.

2. Electrical Method

Passing electric current through a coil around a material.

3. Induction Method

Placing a magnetic material near a magnet to make it magnetic.

Demagnetization

This is the process of removing magnetic properties from a magnet.

Methods:

  • Hammering
  • Heating
  • Dropping repeatedly
  • Applying alternating current

Uses of Magnets

  1. Used in compasses for direction.
  2. Used in electric motors.
  3. Used in loudspeakers.
  4. Used in refrigerators (door seals).
  5. Used in magnetic cranes to lift metals.
  6. Used in generators.
  7. Used in data storage devices.

Earth as a Magnet

The Earth behaves like a giant magnet.

  • North pole of magnet points to Earth’s North
  • Helps in navigation using compass

Practical Activities

Activity 1: Attraction Test

Bring a magnet near different objects.

Observation: Iron objects are attracted.

Conclusion: Magnets attract only magnetic materials.

Activity 2: Pole Interaction

Bring like and unlike poles together.

Observation: Like poles repel, unlike poles attract.

Conclusion: Magnetic poles interact in specific ways.

Activity 3: Magnetic Field Pattern

Sprinkle iron filings around a magnet on paper.

Observation: Patterns form around the magnet.

Conclusion: Magnetic field exists around a magnet.

Conclusion

Magnetism is an important force that allows magnets to attract certain materials. Magnets have poles, produce magnetic fields, and are widely used in everyday life and modern technology.

Evaluation

Answer the following questions:

  1. Define magnetism.
  2. Mention four magnetic materials.
  3. State four properties of magnets.
  4. What are magnetic poles?
  5. Explain magnetic field.
  6. State three uses of magnets.
  7. Differentiate between magnetic and non-magnetic materials.
  8. Explain how to make a magnet.
  9. What is demagnetization?
  10. State two methods of demagnetization.

Objective Questions

Choose the correct answer from A–D.

  1. Magnetism is the force of ______.
    A. light
    B. attraction and repulsion
    C. sound
    D. heat

Answer: B

  1. A material attracted by a magnet is called ______.
    A. non-magnetic
    B. magnetic
    C. transparent
    D. insulator

Answer: B

  1. A magnet has ______ poles.
    A. one
    B. two
    C. three
    D. four

Answer: B

  1. Like poles ______ each other.
    A. attract
    B. destroy
    C. repel
    D. melt

Answer: C

  1. The strongest part of a magnet is the ______.
    A. center
    B. poles
    C. middle only
    D. base

Answer: B

  1. A natural magnet is ______.
    A. iron nail
    B. lodestone
    C. copper wire
    D. plastic

Answer: B

  1. Magnetic field lines move from ______.
    A. South to North
    B. East to West
    C. North to South
    D. West to East

Answer: C

  1. The Earth behaves like a ______.
    A. battery
    B. magnet
    C. bulb
    D. wire

Answer: B

  1. A compass uses ______.
    A. heat
    B. magnetism
    C. light
    D. sound

Answer: B

  1. Removing magnetic property is called ______.
    A. magnetization
    B. demagnetization
    C. conduction
    D. reflection

Answer: B

Essay Questions

  1. Define magnetism and state its properties.
  2. Explain magnetic and non-magnetic materials with examples.
  3. Describe magnetic fields and field lines.
  4. State and explain methods of making magnets.
  5. Explain the uses of magnets in daily life.

Assignment

  1. List five magnetic and five non-magnetic materials.
  2. Draw and label a bar magnet showing its poles and field lines.
  3. Explain three uses of magnets.

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