Pei Hwa Presbyterian Primary
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janet_lee88:
The concept to be tested should be Properties of Materials - lightweight/transparent/breakable.
:rotflmao: :rotflmao:Jennifer:
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke.
I also think the same thing...whatever material, the hamster will die.
Seriously, why ask such questions ?
But the setter tries to be \"very creative\" lor, that's why came up with hamster instead of the usual fish tank scenario. -
janet_lee88:
there is a florist qn:
:rotflmao: :rotflmao:Jennifer:
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke.
I also think the same thing...whatever material, the hamster will die.
Seriously, why ask such questions ?
Florists would remove some leaves from their freshly-cut flowers before putting them in the containers for sale. Based on Alvin's experiment, explain why the florist would do that.
The less leaves the flowers have, the less amount of water it needs. therefore it helps them to save water in helping the flower survive.
The experiment was to see whether the number of leaves affects the amount of water being absorbed by the roots. -
Jennifer:
there is a florist qn:
Seriously, why ask such questions ?janet_lee88:
[quote=\"Jennifer\"]
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke.
Florists would remove some leaves from their freshly-cut flowers before putting them in the containers for sale. Based on Alvin's experiment, explain why the florist would do that.
The less leaves the flowers have, the less amount of water it needs. therefore it helps them to save water in helping the flower survive.
The experiment was to see whether the number of leaves affects the amount of water being absorbed by the roots.[/quote]My son said: :yikes:
I say: :siao: -
dyh:
my son thought it is to do with heat too. but the paper stated \"temperature is constant\". so cannot argue with them.[/quote]Another point: the Q is ask about whether the material is suitable for buliding a cage or not, but not asking about the cage design. so I think cannot argue with them.Jennifer:
[quote=\"abc123mama\"]P5 science section B: my boy did an average job. Previously, he always lost marks because of incomplete description. This time, he had abnormal and creative thinking to the questions. For example, cage for pet mouse. He thinks if he uses glass, the mouse will be overheated.
I do not think your boy is wrong to think the hamster will die from heat.
The qn is too vague - a 1 dimensional diagram of a house with no windows or labels it is a open top whatsoever.
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke.
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Chenonceau had recommended \"LiSC* Answering Technique for Upper Primary Science\" sold by Science Heuristics in Goldhill Square. It is very expensive and cost $37.50, but a worthwhile investment for P5-P6 parents (This book is for parents NOT the kids).
Its website http://www.scienceHeuristics.sg -
notabox:
err...all P1s knew the class they have been alloted to already, don't they?
Underst that the class will stay the same throughout to P2 (enbloc, no change), i think my ds' form teacher said she will follow him to P2 too... -
dyh:
Double digits? At this rate, by the time my son gets to P6, he'll be :imdrowning:
For my sons, it is a drop between 5 to 10 marks for languages. -
Willow:
sorry! I meant P1s next year.notabox:
err...all P1s knew the class they have been alloted to already, don't they?
Underst that the class will stay the same throughout to P2 (enbloc, no change), i think my ds' form teacher said she will follow him to P2 too...
Yes, current P1s will move up to P2 together with their classmates. Teachers may or may not be the same. My boy had a change of form teacher. -
Jennifer:
I googled and found a better answer to this qn: reduce the rate of transpiration (water loss via the leaves) in order to keep the flower from wilting.there is a florist qn:
Florists would remove some leaves from their freshly-cut flowers before putting them in the containers for sale. Based on Alvin's experiment, explain why the florist would do that.
The less leaves the flowers have, the less amount of water it needs. therefore it helps them to save water in helping the flower survive.
The experiment was to see whether the number of leaves affects the amount of water being absorbed by the roots.
PROLONGING THE LIFE OF CUT FLOWERS AND FOLIAGE
Prevent wilting and improve water uptake. Extending from the roots through the stem and out into every part of the leaves and flowers are water-conducting xylem cells through which water moves to keep the whole plant turgid. This lifeline of xylem cells must continue to work to prevent wilting and death. For water to continue to circulate, some must be transpired (given off and lost) by the leaves and flowers. If transpiration is too rapid, the
plant wilts and dies. Thus, to keep the flowers, leaves, and stem from wilting, water must be continuously taken up into all parts of the plant but must not be lost too rapidly.
source: http://web.extension.illinois.edu/cook/downloads/9203.pdf -
S6169:
The 2nd part of the Q mentioned that circuit will remain closed for a while? I think the circuit will remain closed untill the battery has run down.
a) The doorbell rang when the switch was closed, the circuit became closed. The iron core became an electromagnet which attracts the armature.Jennifer:
[quote=\"S6169\"]I think 2nd part of this this Q is wrong. when the switch is off, the spring metal (the conductor of electricity) still in contact, so the circuit is still a close circuit and everything is functioning.(electric induced magnetic force is still there).
What is the Model answer for the 1st part of the Q? From my boy, I think the answer also inaccurate.
b) Even though the switch was turned off, the iron core remains a temporary magnet for a while, attracting the metal armature and closed the contact, thus making the circuit closed.
For the 1st part of the Q, my son said the teacher mentioned about the resistance when she try to explain the answer.
Indeed, It is too complicated for a P5 student.[/quote]Check out this link, very interesting http://home.howstuffworks.com/home-improvement/repair/doorbell3.htm
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