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

Nutrient agar in petri dishes Petri dishes put in ziploc and numbered

Mixing the materials together Heating the mixture to required temperature

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 PICTURESPetri 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 - TV button: a bit of bacteria growth noticeable

DAY 4 PICTURES

Overall shot of the Petri dishes

Petri dish 1 Petri dish 2 Petri dish 3

Petri dish 4 Petri dish 5 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

DAY 5 PICTURES

Petri dish 1 Petri dish 2 Petri dish 3

Petri dish 4 Petri dish 5 Petri dish 6

Petri dish overall shot

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

DAY 6 PICTURES

Petri dish 1 Petri dish 2 Petri dish 3

Petri dish 4 Petri dish 5 Petri dish 6

Petri dish overall

DAY 7 15/12 Piano keys: nothing Door knobs: nothing Dining table: bacteria growth starts Hand phone: nothing Computer keyboard: nothing TV button: nothing

DAY 7 PICTURES