Science




 * Science Fair Marking Term 2 2011**

☒ Not achieved ☑Achieved☑☑Advanced


 * Scientific Process and Background:**

☑Clear aim/hypothesis carried through

☑Method, accurate experimentation

☑Accurate experimentation, controls, variables, repetitions

☑Results clear, accurate, include appropriate data

☑Conclusions are in line with aim/hypothesis

☑Results are interpreted and discussed (conclusion)


 * Technical Skill:**

☑Design of the experiment

☑Use of apparatus and materials

☑Imaginative/creative ideas
 * Originality:**

☑New/Unusual application in science


 * Presentation of Display:**

☑☑Colour/form/clarity/graphics

☑Innovative appeal


 * Log Book:**

☑ Authentic ongoing record with raw data included

☑ Has supporting documentation, bibliography, acknowledgements


 * Teacher Comment:**

What a fantastic Science Fair experiment Maddison. You were well organised and have presented a great display. The next step for your learning is to do the experiment more than once to see if the same things happen. You have made good observations of what happened with the bacteria that was growing. You have very generally described what bacteria was growing, was there any way to specifically identify all the different types e.g. what did the different colours mean? did the smooth or fuzzy bacteria mean anything different?

I think that my science fair was average. But I did it quite fast so I didn't really research into the bacteria thing much.
 * Student Comment:**

**Wow, what an interesting experiment. Bring your results to school so you can do some research and begin to write up your explanation. Thanks Maddy.**

**Idea and Purpose** I came up with the idea of investigating bacteria when we came home one evening to find our dog had been shut inside and had very happily had licked off and eaten off half a pound of butter that had been left on the bench. Mum immediatly wanted to throw it out but I wanted to know if the dog licking the butter was worst than a human licking the butter, and how much bacteria and germs had he actually left on the butter.

My aim for this expererment is to test the rate of bacteria growth in dog and human saliva and see who has more bacteria and which bacteria grows faster.
 * Aim **

My hypothesis is that the dogs will have more bacteria because dogs love to dig holes, eats dead rodents, dig up old rotten bones, catch birds and eat mice.
 * Hypothesis **

2 friendly dogs 1 adult 1 child 8 petri dishes 8 cotton swabs Packet of Gelitine 1 oxo cube 8 sealable plastic bags 1 permanent marker
 * Materials **

Firstly I had to make the agar. I boiled 500mls of water and added 1 oxo cube. When this was cool I poured it into the Label all of the petri dishes 2 adult, 2 child, 2 Ruby (dog) and 2 Charlie (dog). Get a sample of saliva from each of the different bacteria and dab it on the petri dishes being carfull not to pierce the agar then place each dish into a clean zip lock bag and label them adult, child, dog 1 & dog 2 then zip them up and place them in in an area at room temperature out of the way of being disturbed. Do not open them untill you think it is had enough time to grow a reasonable amount of bacteria. Observe them as they begin to grow the bacteria.
 * Procedure **

__12 hours later__ No change in petri dishes.
 * Observations **

__24 hours Later__ A few tiny dots but they were so small that they might not of even been bactria.

__36 hours later__ Noteble changes they were defintly growing lots of bacteria at this stage the amount of bacteria were about the same not what I would of thought.

__48 hours later__ All dishes growing lots of bacteria adult and child growing mould and fur but the dogs were growing colourful and had lots of differnt colour shap and size bacteria growing.

__Relation To Life__ My experiment relates to life by seeing when you get slobberd on by a dog is it really that bad.

__Results Analyses__

After completing the experiment I found that there was no obvious difference between how much bacteria grew but there was a difference between the types of bacteria.

Human:more towards the mould and fur.

Dogs: The dogs grew more colorful spots than the mould and fur.

Conclusion

After completing the experiment I found that there was no big difference between the two which was not what I would have thought.