<![CDATA[2010 PSLE Science]]>How was the PSLE Science? Please vote after monday’s paper.

]]>https://forum.kiasuparents.com/topic/14534/2010-psle-scienceRSS for NodeSat, 18 Apr 2026 11:01:25 GMTFri, 08 Oct 2010 11:22:30 GMT60<![CDATA[Reply to 2010 PSLE Science on Wed, 17 Nov 2010 16:13:16 GMT]]>Does anyone know the exact way that jungle survival related question is phrased?


thanks!

]]>https://forum.kiasuparents.com/post/296476https://forum.kiasuparents.com/post/296476Wed, 17 Nov 2010 16:13:16 GMT<![CDATA[Reply to 2010 PSLE Science on Wed, 27 Oct 2010 13:20:41 GMT]]>

RainyDay:
the kiasu student:

[quote=\"Polar bear\"]Thanks.

One of my suggestions for the decomposition question was to put the jar in a dark room and my reason was that it would allow more decomposers to come into the jar, thus speeding up decomposition.

Can someone tell me if this is acceptable

You are half right and half wrong. I also said that should put it in a dark place, but not to attract decomposers nor allowing more of them go into the jar. This will reduce the rate of evaporation of the moisture from the moist leaves, hence more moisture is kept, as decomposers need water to decompose dead organisms, this would speed up decomposition.

I don't really know whether this is correct or not but i decide to play safe by not putting that the dark is a factor in resulting the speed of the decomposition.[/quote]I do not know what is the question. However, it appears to do with how to increase the rate of decomposition. In my opinion, the rate can be increased if :

1. We make it easier for decomposer to break down the dead organism into simple substances by :

(a) Cutting the dead organism into smaller pieces
(b) Introduce helper of decomposer to break down the dead organism into smaller pieces.

2. Increase the number of decomposer (I think this is what the question is asking)
(a) Expose the dead organism to more decomposer by not covering it.

(b) Provide conditions for the decomposer to multiply quickly :
(i) Temperature (Warm but not too hot)
(ii) Oxygen
(iii) Moisture
(I don't remember that light is a critical factor. Light may cause overheating that cause the dead organism to dry up)

]]>https://forum.kiasuparents.com/post/283573https://forum.kiasuparents.com/post/283573Wed, 27 Oct 2010 13:20:41 GMT<![CDATA[Reply to 2010 PSLE Science on Wed, 27 Oct 2010 12:46:00 GMT]]>

the kiasu student:
Polar bear:

Thanks.

One of my suggestions for the decomposition question was to put the jar in a dark room and my reason was that it would allow more decomposers to come into the jar, thus speeding up decomposition.

Can someone tell me if this is acceptable

You are half right and half wrong. I also said that should put it in a dark place, but not to attract decomposers nor allowing more of them go into the jar. This will reduce the rate of evaporation of the moisture from the moist leaves, hence more moisture is kept, as decomposers need water to decompose dead organisms, this would speed up decomposition.

I don't really know whether this is correct or not but i decide to play safe by not putting that the dark is a factor in resulting the speed of the decomposition.

]]>https://forum.kiasuparents.com/post/283558https://forum.kiasuparents.com/post/283558Wed, 27 Oct 2010 12:46:00 GMT<![CDATA[Reply to 2010 PSLE Science on Wed, 27 Oct 2010 12:43:46 GMT]]>

ZoeyTan:
i think my answers are totally wrong....

could u all see whether it is acceptable?

My answer: he should water the plant daily as with more moisture,decomposition can take place faster.

he could increase the number of holes at the lid so that more oxygen could enter the bin. with more oxygen, the rate of decomposition will be higher.

(i felt that it is totally wrong)....

another thing...about the forest one..what he is thirsty then the plants and fruits could nt be eaten that one... i wrote he could cover the leaves of the plant with the plastic sheet using the string.As the plant repire, it gives off water vapour through its stomato. As the water vapour condenses onto the cooler inner surface of the plastic sheet, it will become water droplets. The boy can drink the water droplets..

and another thing ...about the toilet...
i wrote as the plastic bottle occupy space, it will take up some space in the tank, therefore, lesser water is needed to fill up the tank

b) Solid occupies space..(it is wrong?i should write matter right?)
For me i put he can poke more holes into the container allowing decomposition to take place faster and also make the lid of the container out so that bacteria can make decomposition faster

]]>https://forum.kiasuparents.com/post/283556https://forum.kiasuparents.com/post/283556Wed, 27 Oct 2010 12:43:46 GMT<![CDATA[Reply to 2010 PSLE Science on Wed, 27 Oct 2010 12:35:48 GMT]]>

kiasumum_2010:
anonymus:

[quote=\"tryunited\"]what is the answer on the MCQ qn on aeroplane, propellor and rubber band, which part(s) has/hv kinetic energy?


wing / propellor / rubber band

i put the option which had all the 3..wing, propellor and ruber band 🙏

i thought it should be the propellor only as the rubber band came to a standstill before it went into the air....[/quote]For me i also put all 3.Because i still remember my teacher told me that when something moves,it has kinetic energy even though that object is not a converter of energy.So i think the aeroplane is 4.You should check it out nevertheless i am wrong

]]>https://forum.kiasuparents.com/post/283549https://forum.kiasuparents.com/post/283549Wed, 27 Oct 2010 12:35:48 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 10:58:33 GMT]]>Maybe she ran out of time. Poor girl… I remember there was a time a few years back when I made a transfer error in a paper and I got like, 24/60, because when I discovered it, it was too late and I could only change a few.

]]>https://forum.kiasuparents.com/post/276604https://forum.kiasuparents.com/post/276604Thu, 14 Oct 2010 10:58:33 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 07:47:52 GMT]]>

junrahmat:
DS's friend told the class that she had forgotten to shade 10 OAS ans for mcq. *faint*

:!: they are all on the same OAS, how come forgotten to shade :?

]]>https://forum.kiasuparents.com/post/276464https://forum.kiasuparents.com/post/276464Thu, 14 Oct 2010 07:47:52 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 07:37:52 GMT]]>

tansm2010:
James Ang:

[quote=\"junrahmat\"]DS's friend told the class that she had forgotten to shade 10 OAS ans for mcq. *faint*


That's 20 marks lost?!?

Oh no, hope that he do well in other paper and subjects 🙏[/quote]Aw, she must be sad 😞

]]>https://forum.kiasuparents.com/post/276454https://forum.kiasuparents.com/post/276454Thu, 14 Oct 2010 07:37:52 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 07:16:26 GMT]]>

snowman.697:
Mass = how much space a certain object occupies. Isn't that vol.?

mass is how much matter is inside an object. vol is just how much space an object contains

]]>https://forum.kiasuparents.com/post/276432https://forum.kiasuparents.com/post/276432Thu, 14 Oct 2010 07:16:26 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 06:31:03 GMT]]>20mark can let it clear Ugrade le…

]]>https://forum.kiasuparents.com/post/276396https://forum.kiasuparents.com/post/276396Thu, 14 Oct 2010 06:31:03 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 04:13:29 GMT]]>

James Ang:
junrahmat:

DS's friend told the class that she had forgotten to shade 10 OAS ans for mcq. *faint*


That's 20 marks lost?!?

20 marks gone just like that... Poor girl..

]]>https://forum.kiasuparents.com/post/276294https://forum.kiasuparents.com/post/276294Thu, 14 Oct 2010 04:13:29 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 04:03:03 GMT]]>

James Ang:
junrahmat:

DS's friend told the class that she had forgotten to shade 10 OAS ans for mcq. *faint*


That's 20 marks lost?!?

Oh no, hope that he do well in other paper and subjects 🙏

]]>https://forum.kiasuparents.com/post/276284https://forum.kiasuparents.com/post/276284Thu, 14 Oct 2010 04:03:03 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 03:07:39 GMT]]>

junrahmat:
DS's friend told the class that she had forgotten to shade 10 OAS ans for mcq. *faint*

That's 20 marks lost?!?

]]>https://forum.kiasuparents.com/post/276192https://forum.kiasuparents.com/post/276192Thu, 14 Oct 2010 03:07:39 GMT<![CDATA[Reply to 2010 PSLE Science on Thu, 14 Oct 2010 00:12:15 GMT]]>DS’s friend told the class that she had forgotten to shade 10 OAS ans for mcq. faint

]]>https://forum.kiasuparents.com/post/276012https://forum.kiasuparents.com/post/276012Thu, 14 Oct 2010 00:12:15 GMT<![CDATA[Reply to 2010 PSLE Science on Wed, 13 Oct 2010 13:35:34 GMT]]>

snowman.697:
Mass = how much space a certain object occupies. Isn't that vol.?

No, refer to ur science guide. And guys, y still tok abt PSLE?

]]>https://forum.kiasuparents.com/post/275908https://forum.kiasuparents.com/post/275908Wed, 13 Oct 2010 13:35:34 GMT<![CDATA[Reply to 2010 PSLE Science on Wed, 13 Oct 2010 13:26:53 GMT]]>

Tapeworm:
anonymus:

[quote=\"Learner1234\"]Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?


Hi friend,
If u r referring 2 the qt asked in PSLE, it was
\"How 2 increase the rate of decomposition\"

Yr ans (As 4 as i know) is correct. Adding insects like termites n earthworms the rate of decomposition can b faster.Right ??? Any expert comments?

hi, yeah that's what i put too. i put 1. poke more holes (more oxygen) then 2. add an earthworm that will increase the rate of decomp[/quote]HI Tapeworm,
Your answer is correct (Earthworm)

]]>https://forum.kiasuparents.com/post/275902https://forum.kiasuparents.com/post/275902Wed, 13 Oct 2010 13:26:53 GMT<![CDATA[Reply to 2010 PSLE Science on Wed, 13 Oct 2010 11:42:06 GMT]]>

anonymus:
Learner1234:

Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?


Hi friend,
If u r referring 2 the qt asked in PSLE, it was
\"How 2 increase the rate of decomposition\"

Yr ans (As 4 as i know) is correct. Adding insects like termites n earthworms the rate of decomposition can b faster.Right ??? Any expert comments?

hi, yeah that's what i put too. i put 1. poke more holes (more oxygen) then 2. add an earthworm that will increase the rate of decomp

]]>https://forum.kiasuparents.com/post/275860https://forum.kiasuparents.com/post/275860Wed, 13 Oct 2010 11:42:06 GMT<![CDATA[Reply to 2010 PSLE Science on Wed, 13 Oct 2010 07:21:22 GMT]]>

Learner1234:
Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

Hi friend,
If u r referring 2 the qt asked in PSLE, it was
\"How 2 increase the rate of decomposition\"

Yr ans (As 4 as i know) is correct. Adding insects like termites n earthworms the rate of decomposition can b faster.Right ??? Any expert comments?

]]>https://forum.kiasuparents.com/post/275687https://forum.kiasuparents.com/post/275687Wed, 13 Oct 2010 07:21:22 GMT<![CDATA[Reply to 2010 PSLE Science on Tue, 12 Oct 2010 16:21:51 GMT]]>

Learner1234:
Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

only bacteria and fungi are decomposers.

]]>https://forum.kiasuparents.com/post/275246https://forum.kiasuparents.com/post/275246Tue, 12 Oct 2010 16:21:51 GMT<![CDATA[Reply to 2010 PSLE Science on Tue, 12 Oct 2010 16:06:15 GMT]]>

Learner1234:
Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

It is NOT a decomposer. It is a helper of decomposer.

A decomposer breaks down dead organism to SIMPLE substances.

A helper of decomposer breaks down dead organism into SMALLER pieces.

]]>https://forum.kiasuparents.com/post/275240https://forum.kiasuparents.com/post/275240Tue, 12 Oct 2010 16:06:15 GMT<![CDATA[Reply to 2010 PSLE Science on Tue, 12 Oct 2010 15:51:55 GMT]]>Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

]]>https://forum.kiasuparents.com/post/275233https://forum.kiasuparents.com/post/275233Tue, 12 Oct 2010 15:51:55 GMT<![CDATA[Reply to 2010 PSLE Science on Tue, 12 Oct 2010 15:32:51 GMT]]>

atutor2001:
Sun_2010:

[quote=\"atutor2001\"]
I think my earlier answer is wrong. The towel and newspaper is to be used as filter. The answer may be in this link :

http://adventure.howstuffworks.com/survival/wilderness/jungle-survival2.htm

O, oh!

but to filter thru towel means lot of water needs to be collected. say 200 ml atleast. Other wise the towel would soak up most of the water.

newspaper if used as filter may just tear.

hmm...

Yes, we would need subsequent amount of water to filter and there should be water in a jungle because there are trees - implying there is water.

Normal science assessment books always give example of how to collect water in a desert, so we mistaken that this question is based on scenario of \"no water\".

Based on what I gathered from the posting, the question did not state that there is no water, rather there is a need to \"produce\" DRINKABLE water.

The plastic sheet can be folded to form the \"funnel\", the towel can be used to be the coarse filter medium and newspaper acting as the filter paper we use to line the funnel in the lab.[/quote]Wa heng ah i was dumbfounded by that question but luckily i put collect rain water

]]>https://forum.kiasuparents.com/post/275230https://forum.kiasuparents.com/post/275230Tue, 12 Oct 2010 15:32:51 GMT<![CDATA[Reply to 2010 PSLE Science on Tue, 12 Oct 2010 15:19:42 GMT]]>

Sun_2010:
atutor2001:

[quote=\"anon123\"]I want to know ans for qns 34

It's about 'someone' is in a jungle,all the fruits and plants cant be eaten he only have the following items to produce drinkable water:
.Plastic Sheet
.Newspaper
.Towel
.String

What should he do?

Help me with this qns pls..... :idea:

I think my earlier answer is wrong. The towel and newspaper is to be used as filter. The answer may be in this link :

http://adventure.howstuffworks.com/survival/wilderness/jungle-survival2.htm

O, oh!

but to filter thru towel means lot of water needs to be collected. say 200 ml atleast. Other wise the towel would soak up most of the water.

newspaper if used as filter may just tear.

hmm...[/quote]Yes, we would need subsequent amount of water to filter and there should be water in a jungle because there are trees - implying there is water.

Normal science assessment books always give example of how to collect water in a desert, so we mistaken that this question is based on scenario of \"no water\".

Based on what I gathered from the posting, the question did not state that there is no water, rather there is a need to \"produce\" DRINKABLE water.

The plastic sheet can be folded to form the \"funnel\", the towel can be used to be the coarse filter medium and newspaper acting as the filter paper we use to line the funnel in the lab.

]]>https://forum.kiasuparents.com/post/275220https://forum.kiasuparents.com/post/275220Tue, 12 Oct 2010 15:19:42 GMT<![CDATA[Reply to 2010 PSLE Science on Tue, 12 Oct 2010 14:57:10 GMT]]>

snowman.697:
Mass = how much space a certain object occupies. Isn't that vol.?

Matter does not necessarily occupy space. A black hole has a huge mass cramped into an infinitesimally small point. What we know is that matter is gravitionally attracted to other matter, giving it the impression of \"weight\", which is really the force that pulls matter together.

]]>https://forum.kiasuparents.com/post/275214https://forum.kiasuparents.com/post/275214Tue, 12 Oct 2010 14:57:10 GMT