Q&A - P3 Science

[2bbtang]

usaik:

2bbtang:

Hi, can anyone here advise me?


My son's recent CA's question:

Dave set up the experiment as shown below and left them untouched for one week.

It show 4 different experiment setups. I will describe as below.

SetupA: 1 grasshopper in a tank with leaves and cover with a lid with holes.
SetupB: 1 grasshopper in a tank with leaves and cover with enclosed lid (without holes).
SetupC: 1 grasshopper in a tank and cover with a lid with holes.
SetupD: 1 grasshopper in a tank and cover with enclosed lid (without holes)

One of the question was asked:

What does Dave's experiment shows that living things need ________ to survive.

They are supposed to put a tick on the correct boxes for the above question.

Air
food
water
space

My son : indicate 2 ticks on the above question : He tick for AIR and FOOD.

But the teacher answer it as : Air, Food and Water.

My son told me this question is so unfair. cos' the question asked \"From Dave's experiment. And in the experiment, there isn't any WATER!!!!? If the question asked in a more general way like \"what does living things need _____ to survive, it it more straight forward. But it indicate as \"Dave's experiment\", isn't I suppose to based on the experiment?

What do you think? I felt my boy is correct too...

Hi 2bbtang,
Is the above the entire question? Sometime the questions may have been broken into parts and the student may infer from the different questions/parts leading this this one question.

However, having said that, some of the school question can be rather \"unfair\" but I understand from this forum that in PSLE there will be more stringent quality assurance process in setting questions so such ambiguous question I guess would be filtered out.

There are 3 questions under this.

Q1: (a) Which setup(s) will the grasshopper survive after 1 week?
Q2: (b) Explain your answer in (a)
Q3: (c) \"Third question is the one stated above\"

Anyway, I have checked with the teacher, the answer is the \"water\" is from the leaves. So there is water in the setup.

Sigh. Think, no point to argue. But my son feels is still unfair.

Hope, there will not be any ambiguous question like this in future.
Thanks to all.

[Nebbermind]

After having gone thru PSLE with my boy, I realised that it's not easy getting the correct answers to science qns even if u have all the facts.


Take this as a lesson learned as such instances usually get etched into the mind permanently

[zeemimi]

i have questions regarding life cycles.


sorry if this question has been posted before. couldn’t find time to plough through all the pages.

Is human / mammal 2 stage or 3 stage life cycle? Egg in the womb is it counted as 1 stage? Or give birth to young alive -> adult (i.e. 2 stage)?

Thank you.

[tianzhu]

zeemimi:

i have questions regarding life cycles.


sorry if this question has been posted before. couldn't find time to plough through all the pages.

Is human / mammal 2 stage or 3 stage life cycle? Egg in the womb is it counted as 1 stage? Or give birth to young alive -> adult (i.e. 2 stage)?

Thank you.

Hi

Most mammals give birth to their young. However, there are exceptions, the spiny anteater and the platypus lay eggs.

In primary science, you can take it that those mammals that give birth as having two stages in their life cycles.

Fishes that give birth, eg guppies and swordtails also have two stages life cycle.

Best wishes

[zeemimi]

tianzhu:

zeemimi:

i have questions regarding life cycles.


sorry if this question has been posted before. couldn't find time to plough through all the pages.

Is human / mammal 2 stage or 3 stage life cycle? Egg in the womb is it counted as 1 stage? Or give birth to young alive -> adult (i.e. 2 stage)?

Thank you.

Hi

Most mammals give birth to their young. However, there are exceptions, the spiny anteater and the platypus lay eggs.

In primary science, you can take it that those mammals that give birth as having two stages in their life cycles.

Fishes that give birth, eg guppies and swordtails also have two stages life cycle.

Best wishes

tks. that was what i thought. but i was told that some students were taught that human is considered 3 stage life cycle. Because you must consider the egg in the womb as 1 stage.

Just want to clarify what should be the \"right\" answer.

[ttyh]

P3 science

A picture showing a teddy bear and a Polar bear
Question : Write down a difference between the teddy bear and the polar bar. (Do not compare their sizes, colors and shapes)

Ans 1 - Teddy bear is a non living thing but Polar bear is a living thing

Ans 2 - Teddy bear cannot die but the polar bear can die.

Pls let me know which answer deserves a full 2 marks?
Thanks

[S6169]

ttyh:

P3 science

A picture showing a teddy bear and a Polar bear
Question : Write down a difference between the teddy bear and the polar bar. (Do not compare their sizes, colors and shapes)

Ans 1 - Teddy bear is a non living thing but Polar bear is a living thing

Ans 2 - Teddy bear cannot die but the polar bear can die.

Pls let me know which answer deserves a full 2 marks?
Thanks

I think is ans 2. or other characters of living or non-living things. such as can grow, need water, food and air, etc.

[super-duper-quadruple]

Does anyone know that a grasshopper can fly or not?



Thanks!

[IJJ]

S6169:

ttyh:

P3 science

A picture showing a teddy bear and a Polar bear
Question : Write down a difference between the teddy bear and the polar bar. (Do not compare their sizes, colors and shapes)

Ans 1 - Teddy bear is a non living thing but Polar bear is a living thing

Ans 2 - Teddy bear cannot die but the polar bear can die.

Pls let me know which answer deserves a full 2 marks?
Thanks

I think is ans 2. or other characters of living or non-living things. such as can grow, need water, food and air, etc.

I think scientifically, ans 1 is right, but better would be either 1) ability to move from place to place 2) the need for air, food and water to grow 3)ability to reproduce 4)ability to respond to stimuli. I told my girl, for such question, go straight to the characteristics difference, cannot be wrong.

[IJJ]

super-duper-quadruple:

Does anyone know that a grasshopper can fly or not?



Thanks!

No.
[quote]Generally they are winged, but hind wings are membranous while front wings (tegmina) are coriaceous and not fit for flight. [/quote] from http://en.wikipedia.org/wiki/Grasshopper