kittycat01:

sorry, atutor, the description is not that accurate. it's actually in the psle science paper this year. According to my daughter, the plant is in a sealed beaker of water (no soil) but only the root part is immersed in the sealed beaker. and it's placed under the lamp, not the sun. The rest of the details are correct. Sorry for the confusion. I should have clarified with her first before putting the question down on this forum.


Anyway, just to comment - lots of dd's classmates put CO2 being the answer but others put water.

Hi,

My answer is carbon dioxide as the plant is in a container with limited air. Air only contains 0.03% carbon dioxide. Most of my classmates also choose carbon dioxide as their answer.

atutor2001:

vidhyalog:

[quote=\"vidhyalog\"]Hi - Could I confirm if the answer for this question is :



Abdomen and Thorax only or Head, abdomen and Thorax or anything else. http://i51.tinypic.com/i2sm8k.jpg\"> aa

For such question, I always try to find the answer from the picture by \"spotting the differences\" :

tentacle becomes antennae
simple eye becomes compound eye
mouth becomes proboscle
true leg becomes leg
nothing becomes wings
shape of head, thorax, abdomen becomes different
proleg disappeared

So my answer is true leg is the part that that did not change.[/quote]
Hi Auntie atutor,

I put \"The thorax did not change.\"

Is it acceptable?

TIA.

atutor2001:

vidhyalog:

[quote=\"vidhyalog\"]Hi - Could I confirm if the answer for this question is :



Abdomen and Thorax only or Head, abdomen and Thorax or anything else. http://i51.tinypic.com/i2sm8k.jpg\"> aa

For such question, I always try to find the answer from the picture by \"spotting the differences\" :

tentacle becomes antennae
simple eye becomes compound eye
mouth becomes proboscle
true leg becomes leg
nothing becomes wings
shape of head, thorax, abdomen becomes different
proleg disappeared

So my answer is true leg is the part that that did not change.[/quote]
Hi Auntie atutor,

I put \"The thorax did not change.\"

Is it acceptable?

TIA.

SUPERCKJ:

Anybody did the 2011 RGPS Prelim Science MCQ.


Qustion 28 with a test tube at the top part and an ice protected by metal gauze.

Question: Which one best explains why ice at the bottom tube takes a longer time to melt?

Is the ans 4? Metal gauze prevent heat from reaching the ice.

Hi Uncle/Auntie SUPERCKJ,

The answer is (3) Water conducts heat away slowly.

Please help.


http://i53.tinypic.com/2ytuyyd.gif\">


TIA.

Please help.


http://i51.tinypic.com/30hx75k.gif\">


The air in the flask gains heat from the hot water and expands pushing the coloured water up the tube.

The coloured water gains heat from the hot water and expands and moved up the tube.

Please advise which answer is correct.


TIA.

Please help.


http://i51.tinypic.com/2zya52f.gif\">


TIA.

Please help.


http://i51.tinypic.com/wswn86.gif\">


TIA.

Please help.


http://i55.tinypic.com/wl6oy.gif\">


TIA.

Please help.


http://i54.tinypic.com/6qebm8.gif\">


TIA.