Q&A - PSLE Science

[P5G]

Sun_2010:

P5G:

Please help.



http://www.orlesson.org/orp/09Sc/2009-Sc-SA2-MGS.pdf


Q24.

Ericia carried out an experiment to compare the amount of water in 4 different vegetables. Firstly, she weighed the vegetables. Then she placed the vegetables out in the sun for a few days to dry them before weighing them again. She then recorded her results in the table below.

Please refer to the table in the worksheet.


Based on the above results, which of the following statement(s) is/are true of her experiment?

A. W has less water than Y.

B. X has as much water as W.

C. Z has the least amount of waater.

D. y has the greatest amount of water.


(1) A only

(2) B and C only

(3) A and D only

(4) A, B, C and D


Worksheet answer is (3).

My answer is (4).

Please advise which is correct.

TIA.

I think u have given the wrong link.

Thanks Mr Sun_2010.

I am sorry that the school should be CHIJ St Nicholas SA2.

The correct link is as follows:

http://www.orlesson.org/orp/09Sc/2009-Sc-SA2-StNic.pdf

Worksheet answer is (1).

My answer is (4).

Please advise which is correct.


TIA.

[teachingmum]

Came across this question and is kinda stumped…


An experiment is conducted. 10 seeds were geminated in the dark and 10 similar seeds were germinated in the light. Readings of height, size of leaves were recorded for a week.

Reading A shows short stem but big leaves
Reading B shows long stem but small leaves.

The question asks which set of reading belongs to the seeds germinated in the dark and what the colour of the leaves is…

The problem I have is:
(1) seeds do not need light for germination. In fact, for hydroponic, the seeds for germination are put in a black garbage bag.
(2) germination may take as long as a week or even longer

So, what should the answer be?

Should I assume since there are leaves, photosynthesis shd be happening and hence light will be an impt factor? However, if the true leaves have yet appeared, then REading B cannot be for the seeds germinated in the dark right?

[atutor2001]

teachingmum:

Came across this question and is kinda stumped...


An experiment is conducted. 10 seeds were geminated in the dark and 10 similar seeds were germinated in the light. Readings of height, size of leaves were recorded for a week.

Reading A shows short stem but big leaves
Reading B shows long stem but small leaves.

The question asks which set of reading belongs to the seeds germinated in the dark and what the colour of the leaves is...

The problem I have is:
(1) seeds do not need light for germination. In fact, for hydroponic, the seeds for germination are put in a black garbage bag.
(2) germination may take as long as a week or even longer

So, what should the answer be?

Should I assume since there are leaves, photosynthesis shd be happening and hence light will be an impt factor? However, if the true leaves have yet appeared, then REading B cannot be for the seeds germinated in the dark right?

Hi, don't be upset. The trick in this question lies in the word highlighted in bold \"Readings of height, size of leaves were recorded for a week\".

For normal seeds (beans as covered in Pr sch), germination usually will have been completed by the end of the week. Therefore, the question is actually testing on \"time sense\" and knowledge on \"light is needed for photosynthesis\".

I used to teach my kids to focus on the \"time frame\" given in the question and not be tricked by the keyword \"germination\". Maybe you can try doing the same.

[teachingmum]

Hi atutor,


Thanks. Not so much of upset, but confused by the vagueness or 'trickiness' of the question.

[MOE Hater]

According to what I am taught in learning lab, reading B should be for the plants growing in the dark.

[P5G]

Please help.



http://www.orlesson.org/orp/09Sc/2009-Sc-SA2-StNic.pdf


Q24.

Ericia carried out an experiment to compare the amount of water in 4 different vegetables. Firstly, she weighed the vegetables. Then she placed the vegetables out in the sun for a few days to dry them before weighing them again. She then recorded her results in the table below.

Please refer to the table in the worksheet.


Based on the above results, which of the following statement(s) is/are true of her experiment?

A. W has less water than Y.

B. X has as much water as W.

C. Z has the least amount of waater.

D. y has the greatest amount of water.


(1) A only

(2) B and C only

(3) A and D only

(4) A, B, C and D


Worksheet answer is (1).

My answer is (4).

Please advise which is correct.

TIA.

[ruohoo97]

MOE Hater:

According to what I am taught in learning lab, reading B should be for the plants growing in the dark.

Could do you explain why?

[tianzhu]

P5G:

The correct link is as follows:


http://www.orlesson.org/orp/09Sc/2009-Sc-SA2-StNic.pdf

Worksheet answer is (1).

My answer is (4).

Please advise which is correct.

Hi P5G

The experiment seeks to compare the amount of water in four vegetables.

Therefore, one is required to examine (two or more objects) in order to observe or discover similarities or differences.

The initial weight minus the final weight is the weight of water. This difference multiplied by 100 and divided by the initial weight will give you the percent water content.

For (A) we are comparing vegetables with the same weight as compared to different quantities in the other options.

Best wishes

[rkumar]

Hi teachingmum,


This is actually \"fair comparison\" or \"true comparison\"question. Only 1 specific criteria is used -->the weight of the plant.
[quote]Based on the above results, which of the following statement(s) is/are true of her experiment? [/quote]A true statement can only be made for the comparison of W and Y as their weight at the begining is the same. Any other statements involving the other plants cannot be true as it cannot be substantiated.

Check with your child, true comparison is covered in P3 science
usually with Magnetism and P4 under Heat.

Cheers

[rkumar]

P5G:

Please help.



http://www.orlesson.org/orp/09Sc/2009-Sc-SA2-Nanyang.pdf

Q40 a) Which two mirrors can be removed so that no images of the ball are seen by the eye?


Worksheet answer: A and C.


My answer: B and C (or A and B).


Please advise which is correct?

The question is basically testing your knowledge that light travels in straight lines. What the teacher is looking for is the fact that one of the 2 mirrors must be A or C. A will remove the \"line\" from the object and C from the eye. Rather than either A and another mirror or C and another mirror. They have opted for the best solution A and C.

Cheers