Q&A - P3 Science

[shirley.020816tamzil]

tianzhu:

shirley.tamzil:

[quote=\"tianzhu\"]Hi shirley.tamzil


In primary science, students learnt that bread mould grows quicker in dark, wet and warm conditions.

The toaster heats up the bread and removes the moisture from them; therefore it’s not likely to have moulds after three days. Hence option (1) and (3) are offside.

Between option (2) and (4), I’d go for option (2) because the amount of air in the sealed bag is limited.

Best wishes

I don't understand what you mean when you offside option 1 and option 3.

I thought that since the bread are toasted, so they would be least likely to have mould, so shouldn't the answer be either 1 or 3?

Hi

The question asks for the least amount of mould growing on the bread after three days.

The toasted bread will not be mouldy as it is dried after heating in the oven.

By heating in the oven, the moisture in bread is removed and bacteria are killed. Therefore it’s less likely for the bread to get mouldy due to the absence of moisture. Hence, option (1) and (3) are offside.

Best wishes[/quote]So if the question is rephrased to \"least likely to have mould\", would the answer be different?

[tianzhu]

shirley.tamzil:

So if the question is rephrased to \"least likely to have mould\", would the answer be different?

Hi

\"least likely to have mould\" has a different meaning from “least amount of mould”.

But, I am not sure if the question would be crafted as such if the setter had wanted to ask for \"least likely to have mould\"

For now, let’s focus on the context of the original question, otherwise it may be confusing for kids.

Best wishes

[shirley.020816tamzil]

Need help with the below:


http://postimage.org/image/2f05v93r8/

[starlight1968sg]

shirley.tamzil:

Need help with the below:


http://postimage.org/image/2f05v93r8/

I think only B WILL germinate.
A will not germinate because no water.
C will not germinate because no oxygen.

[atutor2001]

starlight1968sg:

shirley.tamzil:

Need help with the below:


http://postimage.org/image/2f05v93r8/

I think only B WILL germinate.
A will not germinate because no water.
C will not germinate because no oxygen.

Cannot write so short. 2 marks means 4 points. So must write long long :

A will not germinate because there is no water (1st pt) and seeds need water to germinate (2nd pt)

C will not germinate because there is no oxygen (3rd pt) as boiled water does not have dissolved oxygen (4th pt) and seeds need oxygen to germinate (5th pt)

Write like that can get A* one.
(no offence please, just being in a crazy mood ) :lol:

[starlight1968sg]

atutor2001:

starlight1968sg:

[quote=\"shirley.tamzil\"]Need help with the below:


http://postimage.org/image/2f05v93r8/

I think only B WILL germinate.
A will not germinate because no water.
C will not germinate because no oxygen.

Cannot write so short. 2 marks means 4 points. So must write long long :

A will not germinate because there is no water (1st pt) and seeds need water to germinate (2nd pt)

C will not germinate because there is no oxygen (3rd pt) as boiled water does not have dissolved oxygen (4th pt) and seeds need oxygen to germinate (5th pt)

Write like that can get A* one.
(no offence please, just being in a crazy mood ) :lol:[/quote]Really thanks for pointing out! This is also why my dd can't do well in her Sc sect b because her mum can't teach at all.

[shirley.020816tamzil]

starlight1968sg:

atutor2001:

[quote=\"starlight1968sg\"]
I think only B WILL germinate.
A will not germinate because no water.
C will not germinate because no oxygen.

Cannot write so short. 2 marks means 4 points. So must write long long :

A will not germinate because there is no water (1st pt) and seeds need water to germinate (2nd pt)

C will not germinate because there is no oxygen (3rd pt) as boiled water does not have dissolved oxygen (4th pt) and seeds need oxygen to germinate (5th pt)

Write like that can get A* one.
(no offence please, just being in a crazy mood ) :lol:

Really thanks for pointing out! This is also why my dd can't do well in her Sc sect b because her mum can't teach at all. [/quote]Thanks for the A* answer. But the answer sheet says only A will not germinate because there's no water. No mention of C. :?

[atutor2001]

shirley.tamzil:

Thanks for the A* answer. But the answer sheet says only A will not germinate because there's no water. No mention of C. :?

If it is school's answer, can clarify with teacher. If it is those from vendor I think they might have make a mistake. C should be inside - we boil water to remove air and add oil to prevent air from dissolving in the water.

Anyway, from the marks allocated, it is in a way a hint that there are more than 1 set up.

[atutor2001]

starlight1968sg:

..... because her mum can't teach at all.

Hi starlight1968sg

Don't say like that. I also learn on the \"job\" (a total of 12 years - glad it is over).

Anyway, an important note : remind your dd to put in basic mundane information that she thought need not be added because the marker should know e.g. seeds need water to germinate. (this is important because without this information, it does not make sense why no water will affect the germination of seed)

Many times we missed out such basic information and lose mark for nothing.

Cheers

[hermes173]

Good to all P6 pupils out there in the PSLE! :xedfingers: