Q&A - PSLE Science

[superksmum]

Hi all,

Need some advice on what greenhouse effect is and how it benefits plants. Does it also have negative and positive effects?

TIA

[Bookwrappers]

superksmum:

Bookwrappers:

Can anyone advise me what is the difference between heart rate and breathing rate?

Heart rate and breathing rate are interlinked. Heart rate is usually to measure how strenuous the activity is. Breathing rate is to measure the intake of oxygen. Both are about respiration.

Hi, I'm sorry that i still dont quite understand. Breathing rate take in oxygen, den heart rate?

Can anyone help to explain ?

[Sunflower 2000]

superksmum:

Sunflower 2000:

http://i47.tinypic.com/25pms7p.jpg\"> Could anyone help to anwer Q15' A and C?

The question is from the PSLE booklet Pg 50. My DD's answer is similar with the answer key which i think is wrong.However, the teacher did not explain what is the correct answer. :imdrowning:
Thanks.

According to DD's teacher,
A) the eggs of bird Q would be pushed out of the nest, causing less bird Qs to be hatched.

C) when the young of bird P remains silent , the mother bird Q will think that it is her young and feed it

Thank you very much! :thankyou:

[superksmum]

Bookwrappers:

superksmum:

[quote=\"Bookwrappers\"]Can anyone advise me what is the difference between heart rate and breathing rate?

Heart rate and breathing rate are interlinked. Heart rate is usually to measure how strenuous the activity is. Breathing rate is to measure the intake of oxygen. Both are about respiration.

Hi, I'm sorry that i still dont quite understand. Breathing rate take in oxygen, den heart rate?

Can anyone help to explain ?[/quote]
Breathing rate is rate of respiration. Heart rate is pulse.

[superksmum]

Sunflower 2000:

superksmum:

[quote=\"Sunflower 2000\"]http://i47.tinypic.com/25pms7p.jpg\"> Could anyone help to anwer Q15' A and C?

The question is from the PSLE booklet Pg 50. My DD's answer is similar with the answer key which i think is wrong.However, the teacher did not explain what is the correct answer. :imdrowning:
Thanks.

According to DD's teacher,
A) the eggs of bird Q would be pushed out of the nest, causing less bird Qs to be hatched.

C) when the young of bird P remains silent , the mother bird Q will think that it is her young and feed it

Thank you very much! :thankyou:[/quote]You are welcome.

[cccleo]

What’s the difference between steam and air?

[charsen]

cccleo:

What's the difference between steam and air?

Hi
Air is made up of a mixture of gases while steam is made up of hot water vapour.
Charsen

[NY1969]

cccleo:

What's the difference between steam and air?

Steam-- contains high content of water vapour in a specific volume of air

Air-- general term only

[charsen]

superksmum:

Hi all,

Need some advice on what greenhouse effect is and how it benefits plants. Does it also have negative and positive effects?

TIA

Hi
Green house effects is the amount of green house gases like carbon dioxide in the atmosphere.These green house gases trap heat from the sun .As there are more green house gases in the atmosphere,more heat from the sun is trapped in the earth 's atmosphere.There is no positive effect on the plants due to the green house effect as far as i know.But,the negative effect is global warming an the rise of sea levels.
Charsen

[NY1969]

charsen:

superksmum:

Hi all,

Need some advice on what greenhouse effect is and how it benefits plants. Does it also have negative and positive effects?

TIA

Hi
Green house effects is the amount of green house gases like carbon dioxide in the atmosphere.These green house gases trap heat from the sun .As there are more green house gases in the atmosphere,more heat from the sun is trapped in the earth 's atmosphere.There is no positive effect on the plants due to the green house effect as far as i know.But,the negative effect is global warming an the rise of sea levels.
Charsen

Is greenhouse effect tested in exam?