Q&A - P3 Science

[atutor2001]

Just4Fun:

Q fr Lower Block Science by Janet Sim :

Which of the following statesments about our teethn are true ?
a, Our teeth cut and grind the food we eat into simple substances that can be absorbed by our body .
b, Our teeth produce digestive juices to break down food
c, we hv a max of 32 permanent teeth
d, we hv 2 sets of teeth in our life.

Ans is C & d only.

Why (a) is not true ? Anyone can help to explain ?
Thx so much !

(a) is not true because of the words \"simple substances\". This should be covered only in P6 under decomposition. Teeth can only cut and grind food into \"smaller pieces\". In Pr Sc, \"simple substances\" means substances that are much simpler in structure and this can only be achieved through the process called decomposition (P6).

[Just4Fun]

atutor2001:

Just4Fun:

Q fr Lower Block Science by Janet Sim :

Which of the following statesments about our teethn are true ?
a, Our teeth cut and grind the food we eat into simple substances that can be absorbed by our body .
b, Our teeth produce digestive juices to break down food
c, we hv a max of 32 permanent teeth
d, we hv 2 sets of teeth in our life.

Ans is C & d only.

Why (a) is not true ? Anyone can help to explain ?
Thx so much !

(a) is not true because of the words \"simple substances\". This should be covered only in P6 under decomposition. Teeth can only cut and grind food into \"smaller pieces\". In Pr Sc, \"simple substances\" means substances that are much simpler in structure and this can only be achieved through the process called decomposition (P6).

Thanks so much, atutor2001, for yr clear explaination.. Appreciate it very much !

[Champion]

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Q37 (a) State two differences between the rose plant and the mushroom (2m). (Do not compare shape and size)

DD1's answer: The rose plant makes its own food but the mushroom find food.

Is my DD1's answer acceptable?


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Q: The picture shows a cup. Mary's two-year-old sister uses it to drink milk. She accidentally dropped the cup. However, the cup did not break.

What material is the cup likely to be made of? (1m)
Answer Sheet:The cup is likely to be made of metal.

DD1's answer: It is likely to be plastic.
Is my DD1's answer acceptable?

[teh_oh]

Hi Champion,


Mushroom does not ‘find’ food. They feed on other organisms dead or alive.
So my answer will be,
The rose plant makes its own food while the mushroom does not make its own food. It feeds on other organism dead or alive.

For the second question, I will accept Plastic too.

Now hoping others can confirm.

[teh_oh]

Hi Parents,


Below is a question from Conquer Science Exercise 29 - Exploring Materials.

1. Nylon is a man-made material that is usually used for making clothes.
b. Clothes that are made of nylon are more water-resistant than clothes made of cotton. Why is it so?

Answer Key: Nylon is a plastic, which makes it water-resistant.

My query:
Nylon is a plastic? I thought it is a man-made fibre/fabric.
Is there a clearer answer than the above?

Thank you.

[Andaiz]

Champion:

Q37 (a) State two differences between the rose plant and the mushroom (2m). (Do not compare shape and size)

DD1's answer: The rose plant makes its own food but the mushroom find food.

Is my DD1's answer acceptable?

Champion, the instruction says \"Study the following pictures carefully\", so whilst your DD1's answer is acceptable, it is INFERENCE, not OBSERVATION.

Chances are the teacher could be looking for answers like \"The rose plant has leaves whereas the mushroom does not.\"

:shock: :yikes: I also feel the same way, that's its too robotic a kind of answer but at a P3 Subject Briefing, the HOD actually advised such for lower science block :slapshead:

Champion:

Q: The picture shows a cup. Mary's two-year-old sister uses it to drink milk. She accidentally dropped the cup. However, the cup did not break.

What material is the cup likely to be made of? (1m)
Answer Sheet:The cup is likely to be made of metal.

DD1's answer: It is likely to be plastic.
Is my DD1's answer acceptable?

It should be, point is it is unbreakable. Hope that helps!

[SAHM_TAN]

Just kaypo, for the plastic qns, my DS's plastic bottle fell on the ground and crack, maybe metal is a better ans becos there's no chance of cracking even if it fell? Just observation from daily life

[jedamum]

smartmummy:

Hi jedamum!

don't worry! we are here to clear our doubts.I asked in PSLE-Sci thread.The parents should be know.I got answer as follows,

Sun_2010 :

Ceramic is man made.
It may be made from clay (natural material) but it is man made

lukily,ur son don't have materials. :rahrah: :rahrah: :rahrah:

smartmummy,
now sa2, my boy has materials!
to trace back, your previous q&a , the answer in the PSLE thread is
\"Ceramic is man made.
It may be made from clay (natural material) but it is man made\"

my question now is
1) are all metals natural?
2) are all metal alloys man-made?
if 2. is yes, does it mean that the kid have to know which kind of metal is an alloy?

i told my son to just state that metal is made from materials that can be obtain from the ground. don't need to state 'natural material' or man-made material'. is it good enough? the confusion comes when there is MCQ.

need help. thanks.

[smartmummy]

Hi Jedamum!

For P3, I think, we no need to go deeper (atleast for my son’s school).I consider all metals are natural.

[jedamum]

smartmummy:

Hi Jedamum!

For P3, I think, we no need to go deeper (atleast for my son's school).I consider all metals are natural.

thanks smartmummy. :snooze: