Q&A - PSLE Science

[P5G]

Please help.


http://www.orlesson.org/orp/10Sc/2010-P6-Sc-SA2-CHS.pdf


Should the answer for question 9 be (4) instead of (2) as given?

Please advise how to get the answers for questions 14, 17, 23 and 27.


TIA.

[tianzhu]

bobsg01:

Thanks tianzhu, will definately check.

Hi

You're welcome.

Best wishes

[tianzhu]

Hi P5G


For Q10, a student needs to have knowledge of “The Three States of Matter”.

A liquid like water has a fixed volume, it cannot be compressed.

Air has no fixed volume, it can be compressed.

Hence option (1) is correct.

For Q40a, I agree with your answer of picking the plant without leaves as the control unit.

In this experiment, Jeremy wanted to find out if the leaves can give out water vapour. Plants release water to the surroundings through a process called transpiration.

The leaves are removed from plant in the control unit so that we can compare what happens with live leaves to what happens with no leaves. This enables us to conclude that the water droplets on the inner surface of the plastic bag in set up Y come from the leaves.

Best wishes

[Nebbermind]

TZ


I thought it shd be (3) for water vs air…donch think air shd e ‘0’.

[tianzhu]

Nebbermind:

TZ


I thought it shd be (3) for water vs air...donch think air shd e '0'.

Hi

The markings on the sliding indicator show the distance travelled by the plunger of the syringe. I think there is still small space at the tip of the syringe when the plunger reaches zero.

When one press as hard as possible, it’s possible to reach the zero mark.

Watch this video and observe the position of the plunger when the guy applies force.

http://www.blinkx.com/watch-video/the-fire-syringe/GOZmVBYHqBNU8khxc2Ug3g

Best wishes

[ivanhoo99]

Why do we sweat?

I need a full proper answer…
Thank you

[tianzhu]

ivanhoo99:

Why do we sweat?

Hi

This link may help.

http://www.fros-t.com/uploads/How_does_sweat_work.pdf

Best wishes

[P5G]

Please help.


http://www.orlesson.org/orp/10Sc/2010-P6-Sc-SA2-CHS.pdf


Should the answer for question 9 about photosynthesis be (4) instead of (2) as given?

Please advise how to get the answers for questions
14 - seedlings
17 - ring magnets
23 - water - evaporation
27 - friction.


TIA.

[tianzhu]

Hi P5G


For Q9, I have the same answer as you.

For Q14, going through elimination, I’d weed out

Option(1) — The similar seedlings are used not different ones
Option (3) — From the question, we can infer that the seedlings in the garden soil grow well, there is no sign of water deficiency.
Option(4) is out as they do affect the growth rate.

I’d go for option (2) as can be seen from the data, seedlings in garden soil grow faster.(1.5 to 14.4 as compared to 3.1 to 14.8)

For Q17, I believe you just want to confirm the answer, it is option (1), we cannot conclude that Disc Z is non magnetic.

Best wishes

[Nebbermind]

Q27 - (4) S.