Decay refers to the slow destruction of materials in the presence of water, air, and soil. Many factors contribute to decay, including temperature, light, moisture, and the type of material. Examples of materials that undergo decay include dead plants and animals, leftover foods, fruits and vegetable peels, and leaves. Materials that do not decay include rubber, glass, metal, and plastic. The document instructs students to identify decaying and non-decaying materials and observe how samples like banana and bread decompose over a period of days in an experiment.

2. DECAY
What comes in your mind when you
hear the word DECAY?

3. Decay means slowly destroyed into bits in the
presence of water, air and soil.
*Many factors contribute to the processes of
decomposition, including temperature, amount
of light, aeration, moisture, type of material
that is decomposing, and the source of bacteria
and fungi.

4. Examples of materials that undergo decay
are:
-dead bodies of plants and animals
-left over foods
-fruits and vegetable peels
-leaves

5. Examples of materials that do not undergo
decay are:
-rubber
-glass
-metal
-plastic
-hair

6. Undergo Decay
1
2
3
4
5
ACTIVITY 1:
List 5 materials that undergo decay.

7. Do Not Undergo Decay
1
2
3
4
5
ACTIVITY 2:
List 5 materials that do not undergo decay.

8. ACTIVITY 3
Directions: Tell whether each material as
decaying or non-decaying.
1. Stone
2. Styro plate
3. Ripe papaya
4. Glass
5. Dead fish

9. EXPERIMENT:
“What Will I Turn Into?”
Materials Characteristic of the Materials
Before placing
in the set-up
On the 3rd
day
On the 5th
day
On the 8th
day
Banana
Bread
leaves
Cooked rice

10. Guide Questions:
1. What does decay mean?
2. What were the factors that contributed to the
process of decaying?

11. E
V
A
L
U
A
T
I
O
N

12. ASSIGNMENT
1. What are the common sicknesses or diseases resulting
from exposure to decaying materials?
2. What are the effects of decaying materials to one’s
health and safety?