Waste : Meaning and Types

Subject : 

Basic Science and Technology

Term :

First Term


Week 9

Class :

Basic 5 / Primary 5

Previous lesson : 

The pupils have previous knowledge of environmental quality 

Topic :

Definition and Constituents of Waste
Types of Waste
Liquid Waste e.g. refuse
Solid Waste e.g. sewage



Behavioural objectives :

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

  • Define waste
  • Say the examples of types of waste
  • Mention examples of liquid waste e.g. refuse
  • Write out example of solid waste e.g. refuse


Instructional Materials :

  • Wall charts
  • Pictures
  • Related Online Video
  • Flash Cards
  • Some soil sample in Bucket.

Methods of Teaching :

  • Class Discussion
  • Group Discussion
  • Asking Questions
  • Explanation
  • Role Modelling
  • Role Delegation


Reference Materials :

  • Scheme of Work
  • Online Information
  • Textbooks
  • Workbooks
  • 9 Year Basic Education Curriculum
  • Workbooks


Content :

What is waste  ?

Waste is the remnant or the non-useful left over of any product or material whose usefulness has been fully utilized by proper usage of such product . It is the unwanted or unusable remaining part of any material or product the has attained its useful life span . These materials or products later become waste , garbage , refuse or sewage .


What are the types of waste  ? 

Solid Waste : This consists of unusable solid materials that are no longer needed or useful . Examples of solid waste are broken bottles , pieces of paper , metals, food left over ,polythene bag , empty cans  of soft drinks , empty plastic bottles   of soft drinks and energy drinks, used dirty take – away packs etc.. These solid waste are collectively called REFUSE.


Liquid Waste : This consists of unusable liquid materials that are no longer wanted or useable . Examples of such liquid waste are urine , faeces, waste water from various household , waste water from industrial factories ,etc. . These liquid waste are collectively called SEWAGE.





The topic is presented step by step


Step 1:

The class teacher revises the previous topics


Step 2.

He introduces the new topic


Step 3:

The class teacher allows the pupils to give their own examples and he corrects them when the needs arise




The class teacher wraps up or conclude the lesson by giving out short note to summarize the topic that he or she has just taught.

The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.

He or she does the necessary corrections when and where  the needs arise.



  • What is waste  .
  • What is sewage  .
  • What is refuse  .
  • List two examples of sewage
  • Mention two examples of refuse .


Prepare for the next lesson by reading about waste and waste disposal



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