Lesson 25

Lesson 25: Waste in the Environment

Learning Objective

Understanding the effects of improper disposal of waste on the environment

Syllabus Correlations

· Theme: Investigating Materials

· Learning Area: Waste Management

· Learning Objective: Understanding the effects of improper disposal of waste on the environment

Learning Outcomes:

Pupils should be able to:

· identify types of waste in the environment.

· identify sources of waste.

Concept(s) Introduced:

· what waste is;

· examples of waste.

Skills Covered:

· Observing, classifying, making inferences, interpreting data, making conclusions, comparing and contrasting.

Vocabulary/ New Words:

organic waste, plastic, recycle, reuse, solid, waste, waste product

Value(s) Incorporated:

· Having an interest in and curiosity about the environment.

· Being diligent and persevering.

· Realising that science is a means to understand nature.

· Thinking rationally

· Analysing the things around us

Materials Needed:

-

Point(s) to Note:

Explain and give examples on types of waste.

Teaching Strategies
Set Induction	Show images and video on waste around us. Teacher explains to pupils what waste is. Ask pupils what are the common waste. Encourage pupils to think through the effects of exposed rubbish heaps. Component: Introduction
Step 1	Play the content component. Ask pupils to observe what waste can be found in the environment. Images show the types of waste. Explain to pupils that there are three types of waste which are solid, liquid and gas. Play the content component. Ask pupils what are solid, liquid and gaseous waste. Explain on the examples of each waste. Ask pupils to name further examples for each type of waste. Play the content component. Challenge pupils to identify the sources of waste. Ask pupils whether they have witnessed such sources of waste. Play the content component. Teacher explains what waste from home is. Ask pupils to provide examples of such waste. Explain that waste can cause pollution. Play the content component. Teacher explains what waste from factories is. Ask pupils to provide examples of such waste. Explain that chemical waste can create water pollution and poisonous smoke creates air pollution. Play the content component. Teacher explains what waste from motor vehicle is. Ask pupils to provide examples of such waste. Explain how smoke from vehicles contributes to greenhouse effect. Play the content component. Teacher explains what waste from open burning or forest fires is. Ask pupils to provide examples of such waste. Explain that smoke and dust can cause difficulty breathing. Play the content component. Teacher explains what waste from farm is. Ask pupils to provide examples of such waste. Explain the effects of pesticides and insecticides to human health. Play the content component. Teacher explains what waste from food stall is. Ask pupils to provide examples of such waste. Explain the effect of rotten food. Play the content component. Teacher recaps on what the examples of sources and types of waste are. Component: Content
Step 2	Play the activity component. Ask pupils to drag and drop the correct waste into the metal, organic waste and paper categories respectively. Tell pupils to observe the images of the waste well to complete the activity. Play the activity component. Ask pupils to drag and drop the correct waste into the glass, plastic and chemical waste categories respectively. Tell pupils to observe the images of the waste well to complete the activity. Play the activity component. Ask pupils to drag and drop the correct waste into the solid, liquid and gaseous categories respectively. Tell pupils to observe the images of the waste well to complete the activity. Component: Activity
Step 3	There are five questions in this component covering the learning outcomes. Questions 1 to 3 are objective questions. Q4 is a drag and drop activity. Pupils drag and drop the correct answers for the questions. Q5 consists of true or false questions. Pupils need to identify whether the statements are true or false. Use evaluation sheets to assess the pupils’ understanding of this lesson. Component: Evaluation
Step 4	A case study on conserving natural resources. Explain to pupils the importance of conservation. Ask pupils what is needed to be done to conserve. Highlight to pupils that an example of conservation efforts is to reduce, reuse and recycle. Encourage pupils to suggest how they can play their roles to reduce, reuse and recycle. Ask pupils to provide examples. Encourage and challenge pupils to start conserving natural resources. Component: Extension
Conclusion	Conclude the lesson by playing this component to further reinforce understanding of the lesson. Help pupils to define what waste is. Emphasise the types of waste in the environment. Component : Summary