Q&A - PSLE Science

[cccleo]

Can anyone tell me the difference between community and habitat?

[superksmum]

cccleo:

Can anyone tell me the difference between community and habitat?

Hi,
A population: Same species live and reproduce in a particular place. Must have at least two species. E.g. Butterfly and caterpillar

A community: different populations that live together in a same habitat (area)

A habitat: place where a population lives

[superksmum]

Robertpattinsonidle:

superksmum:

[quote=\"Robertpattinsonidle\"]http://i46.tinypic.com/2wqhj80.jpg\">


[b] tom inflated the balloon until it burst. state energy changes that occurred


elastic potential ?????????????? sound+kinetic energy
___________ >____________>__________?

The answer is:
Elastic potential energy (of the balloon)> kinetic energy( of the air in the balloon)> sound energy(popping of balloon).
(confirmed by DD's school science teacher).

That was my answer exactly. But ans key says no kinetic energy but it is heat energy for the second blank!!
Thanks
robertpattinsonidle ft.JB[/quote]

I think it is wrong. How is heat energy involved?

[Sunflower 2000]

http://i48.tinypic.com/142y5ue.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.

[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.

[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

[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.