Transcript Science experiment ---------------------------------

SCIENCE EXPERIMENT
---------------------------------Bacteria growth in the various parts of the house
THE PLAN FOR THE EXPERIMENT
Materials : measuring instrument to an accuracy
to of 0.1cm3 & can measure from 0.1 - 100cm3 at
least, cotton swabs, Petri dish, thermometer
 Materials to make Agar nutrients: agar powder
1.5g, Bovril 2g, sodium chloride 0.5g, water
10cm3


Step 1: mix all the materials to make agar
nutrients (agar powder 1.5g, Bovril 2g, sodium
chloride 0.5g, water 10cm3) into a paste then
slowly add water with stirring until the mixture
reaches to 100cm3.
THE PLAN FOR THE EXPERIMENT


Step 2: Heat the mixture in a boiling water bath
to 95 °C in the required container.
Step 3: pour the mixture evenly into six petri
dishes evenly.
PREPARATION PICTURES
Mixing the materials together
Nutrient agar in petri dishes
Heating the mixture to required temperature
Petri dishes put in ziploc and numbered
DAY 1 9/12

No difference
DAY 2 10/12

No difference
DAY 3 11/12
Piano keys: nothing
 Door knobs: nothing
 Dining table: bacteria growth starts
 Hand phone: nothing
 Computer keyboard: nothing
 TV button: nothing

DAY 3 PICTURES
Petri dish no. 3
Overall pictures of petri dishes
DAY 4 12/12
Piano keys: growth starts -1st
 Door knobs: growth starts -3rd
 Dining table: bacteria growth continues -2nd
 Hand phone: nothing -6th
 Computer keyboard: a bit of bacteria growth
noticeable -4th or 5th
 TV button: a bit of bacteria growth noticeable -4th
or 5th

Overall shot of the
Petri dishes
DAY 4 PICTURES
Petri dish 1
Petri dish 4
Petri dish 2
Petri dish 5
Petri dish 3
Petri dish 6
DAY 5 13/12
Piano keys: most amount of bacteria growth -1st
 Door knobs: 4th
 Dining table: 2nd
 Hand phone: growth starts -6th
 Computer keyboard: 5th
 TV button: 3rd

Petri dish overall shot
DAY 5 PICTURES
Petri dish 1
Petri dish 4
Petri dish 2
Petri dish 5
Petri dish 3
Petri dish 6
DAY 6 14/12
Piano keys: most amount of bacteria growth -1st
 Door knobs: least amount of bacteria growth
noticeable -6th
 Dining table: -3rd
 Hand phone: -4th
 Computer keyboard: -5th
 TV button: -2nd

Petri dish overall
DAY 6 PICTURES
Petri dish 1
Petri dish 4
Petri dish 2
Petri dish 5
Petri dish 3
Petri dish 6
DAY 7 15/12
Piano keys: most amount of bacteria growth -1st
 Door knobs: -4th
 Dining table: bacteria growth starts -5th
 Hand phone: bacteria growth is the least -6th
 Computer keyboard: -3rd
 TV button: -2nd

DAY 7 PICTURES
Petri dish 1
Petri dish 4
Petri dish 2
Petri dish 5
Petri dish 3
Petri dish 6
~THE PREDICTED RESULTS~
~THE RESULTS~
1st -Computer keyboard| 1st -The piano
 2nd - door knobs
| 2nd - TV button
 3rd -hand phone
| 3rd - computer keyboard
 4th - TV button
| 4th - door knob
 5th - dining table
| 5th - dining table
 6th - piano
| 6th – hand phone

TABLE WITH RESULTS TABULATED
Day 1
Day 2
Day 3
Day 4
Day 5
Day 6
Day 7
Piano
keys
-
-
-
1st
1st
1st
1st
Door
knobs
-
-
-
3rd
4th
6th
4th
Dining
table
-
-
Growth
Starts
2nd
2nd
3rd
5th
Hand
phone
-
-
-
6th no
6th
growth!
4th
6th
PC
keys
-
-
-
4th / 5th
5th
5th
3rd
TV
button
-
-
-
4th / 5th
3rd
2nd
2nd
Key: - means same