Basic Science and Technology - Junior Secondary 3 - Environmental hazard VI - Depletion of the ozone layer

Environmental hazard VI - Depletion of the ozone layer

Get it on Google Play
Get it on the Apple App Store
  1. Home
  2. Comprehensive Lesson Plan and Notes
  3. Junior Secondary 3
  4. Environmental hazard VI - Depletion of the ozone layer

TERM: 1ST TERM

WEEK: 9

CLASS: Junior Secondary School 3

AGE: 14 years

DURATION: 40 minutes each for 2 periods

DATE:

SUBJECT: Basic Science

TOPIC: Environmental hazard VI - depletion of the ozone layer

SPECIFIC OBJECTIVES: At the end of the lesson, the learners should be able to

  1. ) Explain the ozone layer
  2. ) State the importance of the ozone layer

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, story-telling, videos from source

INSTRUCTIONAL MATERIALS: Recommended Basic Science textbooks for Junior Secondary School 3

INSTRUCTIONAL PROCEDURES: PERIOD 1-2:

PRESENTATION

TEACHER’S ACTIVITY

PUPIL’S ACTIVITY

STEP 1

Review

The teacher revises the previous lesson.

Learners pay attention

STEP 2

Introduction

He explains ozone layer

Learners pay attention and participate

STEP 3

Explanation

He explains the importance of the ozone layer

Learners pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a short note on the board for the learners to copy

The learners copy the note from the board

 

NOTE

ENVIRONMENTAL HAZARD VI- DEPLETION OF THE OZONE LAYER

The ozone layer is a region in the Earth’s stratosphere containing a high concentration of ozone (O₃) molecules. It is located approximately 15 to 35 kilometers above Earth’s surface and absorbs most of the sun's harmful ultraviolet (UV) radiation, particularly UV-B and UV-C rays. This protective layer is crucial in maintaining life on Earth, as it shields organisms from UV radiation that can cause skin cancer, cataracts, and other harmful effects on living tissues.

 

Importance of the Ozone Layer
The ozone layer plays a vital role in:

  • Protecting Living Organisms: By filtering out the sun's harmful ultraviolet radiation, it reduces the risk of skin cancer, cataracts, and immune system suppression in humans and animals.
  • Preserving Ecosystems: It protects marine ecosystems, especially phytoplankton, which form the base of oceanic food chains and are sensitive to UV radiation.
  • Preventing Environmental Damage: The layer helps maintain stable environmental conditions, which are essential for biodiversity and agricultural productivity

 

EVALUATION:

  1. What is the ozone layer, and where is it located in the Earth’s atmosphere?
  2. Explain how the ozone layer protects living organisms on Earth.
  3. Describe the types of ultraviolet (UV) radiation that the ozone layer absorbs.
  4. Why is the ozone layer important for marine ecosystems, particularly phytoplankton?
  5. List some consequences that could occur if the ozone layer were significantly depleted.

CLASSWORK: As in evaluation

CONCLUSION: The teacher marks their books and commends them positively