Page 54 - SK Year 6 Science DLP

`
Let
Let`s s
Try
Try Hunting for Bacteria
Aim To identify places with a lot of bacteria.

5 petri dishes with lids, ziplock bags, cotton buds, marker pen,
Apparatus and
Materials disposable gloves, 100 ml of hot water, and 100 g of
powdered jelly

Steps

1. Mix the powdered jelly with hot water. Stir
until the powder dissolves.
2. Pour the liquid jelly into the five petri dishes,
cover, and let them cool.
3. Wear gloves and swipe the cotton buds
in four different locations. Examples of the
locations are drain, wall, pots, trees, and
others. Put the cotton buds in the
ziplock bags and label them.
4. Swipe each cotton bud onto the surface of #TIP
the jelly in the petri dishes.
5. Cover the petri dishes, label, and store at Soak the petri dishes in
room temperature. hot water for 5 minutes to
6. Leave one petri dish without any smear. This kill microorganisms.
petri dish is the control in this experiment.
7. Record your observations every day for
one week. # SAFETY
8. Report your observations to the class.
Wash your hands
thoroughly after
conducting the activity.

Which jelly contains the biggest growth of microorganisms? Why?

#TEACHER
• Teacher may prepare the jelly before the activity.
• Teacher may also use other suitable glass or plastic containers with covers.
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