Q&A - PSLE Science

[chk707]

luckystar:

To all, especially parents, thank you so much of the guidence thru out the past 6 years in school academic for the Singapore kids, they will to move on to next stage of school life, wish every one has a good health to have a good mind !

Yeah! Lets all wish the P6 good luck as they move on to a new lvl which is unseen! :celebrate:

[Muffins]

Hi Tianzhu,

Can you please tell me what "merging" is? JedaMum was saying "mods please merge into here" before. I don’t really understand what that means.

And what are kiasupoints? I know you’ve got 1000 kiasupoints so far, Tianzhu.

Sorry this is not related to Science, I just really want to know.

[Lynn1967]

chk707:

luckystar:

To all, especially parents, thank you so much of the guidence thru out the past 6 years in school academic for the Singapore kids, they will to move on to next stage of school life, wish every one has a good health to have a good mind !

Yeah! Lets all wish the P6 good luck as they move on to a new lvl which is unseen! :celebrate:

Kids sitting for exams parents are feeling the stress. Nowsaday most parents cant even teach lower primary.

Sigh...

[chk707]

Lynn1967:

chk707:

[quote=\"luckystar\"]To all, especially parents, thank you so much of the guidence thru out the past 6 years in school academic for the Singapore kids, they will to move on to next stage of school life, wish every one has a good health to have a good mind !

Yeah! Lets all wish the P6 good luck as they move on to a new lvl which is unseen! :celebrate:

Kids sitting for exams parents are feeling the stress. Nowsaday most parents cant even teach lower primary.

Sigh...[/quote]Don't be so pessimistic. I'm sure our kids would do well for their PSLE!

[Muffins]

lalala123:

StudentABC:

If a question shows the life cycles of a grasshopper and mosquito,


and ask:

Based on the diagrams above, which of the following statements between animals X(mosquito) and Y(grasshopper) is/are true?

A Both the adults do not have wings
B Both the young do not live in water
C Both the adults do not give birth to their young alive
D Both are pests in at least one stage of their life cycles

(1) D only
(2)A and B only
(3)B and C only
(4)C and D only

what should the answer be? Should we use the info given in diagram to derive the answer or use our general knowledge??? Would greatly value help!

and if pollination takes place between 2 different types of flowers, will the flowers develop into fruits????

Please help!!! :?:

my answer will be C and D. its so called commom sense

Hi lalala123, the answer for Q1 is C & D, but sometimes it is not using common sense, as StudentABC has said above. I do not think you can derive that the two animals were pests in their life cycles, as it might be helpful to the environment, but in the diagram, you cannot come to that conclusion easily. Sometimes, you have to remember what you have learnt from textbooks and assessment books.

And for Q2, seldom will nature itself do this, but sometimes, the flower may become a hybrid, but Science syllabus says that the flower will not be pollinated. So, I'm going with the Science books on this one and I would say, the flower would not be pollinated.

Hope I helped!

[chk707]

Muffins:

lalala123:

[quote=\"StudentABC\"]If a question shows the life cycles of a grasshopper and mosquito,


and ask:

Based on the diagrams above, which of the following statements between animals X(mosquito) and Y(grasshopper) is/are true?

A Both the adults do not have wings
B Both the young do not live in water
C Both the adults do not give birth to their young alive
D Both are pests in at least one stage of their life cycles

(1) D only
(2)A and B only
(3)B and C only
(4)C and D only

what should the answer be? Should we use the info given in diagram to derive the answer or use our general knowledge??? Would greatly value help!

and if pollination takes place between 2 different types of flowers, will the flowers develop into fruits????

Please help!!! :?:

my answer will be C and D. its so called commom sense

Hi lalala123, the answer for Q1 is C & D, but sometimes it is not using common sense, as StudentABC has said above. I do not think you can derive that the two animals were pests in their life cycles, as it might be helpful to the environment, but in the diagram, you cannot come to that conclusion easily. Sometimes, you have to remember what you have learnt from textbooks and assessment books.

And for Q2, seldom will nature itself do this, but sometimes, the flower may become a hybrid, but Science syllabus says that the flower will not be pollinated. So, I'm going with the Science books on this one and I would say, the flower would not be pollinated.

Hope I helped! :)[/quote]I agree for both answers! :udaman:

[PlasmaStorm]

tianzhu:

Thank you for your help.


Two interesting questions.What's your view?

Q1)When water boils at 100 degree C, bubbles can be seen. What is inside these bubbles? (1) Air (2) Steam (3) Water (4) Water vapour

My guess is it is either water vapour or steam.

Q2)Where does the developing embryo get its food from?
Is it the yolk only or both the yolk and the egg white?

According to the person who posted this question, his answer of yolk only was marked wrong.

Best Wishes

Hi I'm a P6 student and for question 1 I think it is option 1. My mother (kohjl) taught me that if you want to remove the oxygen from the water, I should boil it.

For question 2, I was not very sure so I researched and saw this:

The egg white serves to protect the egg yolk and provide additional nutrition for the growing embryo. It is composed of several proteins, primarily ovalbumin (54%) dissolved in water.

So I guess the answer is both the egg white and the egg yolk.

From: PlasamaStorm

(Formerly: kohjl Jr )

[PlasmaStorm]

emerald:

Very impressed with the answers given here. Maybe someone could help ans this observation by my girl during mealtime :


Why does pepper(powdered) when added to a bowl of soy sauce float and 'move' on the surface before they finally 'settle down'?
:? What caused the 'move'?

Hi I'm a P6 student. What caused the motion could be because of the brownian motion. This is the random movements of tiny particles called atoms.

From: PlasmaStorm

Fomerly: kohjl Jr

[Tang]

PlasmaStorm:

Hi I'm a P6 student and for question 1 I think it is option 1. My mother (kohjl) taught me that if you want to remove the oxygen from the water, I should boil it.


For question 2, I was not very sure so I researched and saw this:

The egg white serves to protect the egg yolk and provide additional nutrition for the growing embryo. It is composed of several proteins, primarily ovalbumin (54%) dissolved in water.

So I guess the answer is both the egg white and the egg yolk.

From: PlasamaStorm

(Formerly: kohjl Jr )

Most past papers from Top school, put egg york as the answer and egg white as an option which was considered not correct.

[endingteen]

ChiefKiasu:

Full.Cream:

My kids were asking me similar qn, ie, how come water is in gaseous state in the air when it's not 100degC. How to answer this?

To answer this question, ask another question:
\"What is the boiling point of water in space, where there is zero atmospheric pressure?\"

the answer is because there is such a thing latent heat of vapourisation which is the amount of energy required to be overcomed in order for water to change from its liquid state to gaseous state and vice versa. it is easier for water to be heated up from liquid to gas because you are heating it and heat is a form of energy. when water is heated to water vapour there is no external agent applied to the vapour to make it lose energy to become a liquid.