Q&A - PSLE Science

[Sun_2010]

jewelbox:

Hi, appreciate any help to ans the 2 qns related to magnet. Thanks. http://i45.tinypic.com/9bkhfd.jpg\">

Ans 3

[BeContented]

DS says all along his understanding is :


During germination, oxygen, water & warmth is required.
But his Mindstretcher teacher says that during germination, oxygen is not required. Only when the leaves start then oxygen is required.

Errhhh…now he’s confused. Anyone can help confirm?

[Little Einstein]

BeContented:

DS says all along his understanding is :


During germination, oxygen, water & warmth is required.
But his Mindstretcher teacher says that during germination, oxygen is not required. Only when the leaves start then oxygen is required.

Errhhh....now he's confused. Anyone can help confirm?

Oxygen is definitely needed. How come Mindstretcher teaches him the wrong concept!
It is just that sunlight is needed when the first leaves appeared.

I am the main science tutor in my centre and i have been teaching Science for the last 12 years! Such mistake cannot be made! :mad:

[Happygolucky]

I have a question from 2011 Catholic High Prelim 2, question 41.

It came with a picture but I have no idea how to post picture. Nonetheless, the question is as follows:

Steve wanted to test the properties of water and air. He placed 2 balloons of the same types, one completely filled with air only and the other completely filled with water and placed them over a candle flame. He lit the candle and observed what happened.

he recorded the time take for the balloon to pop.
Set up A(the one filled with air): 2 sec
Set up B(the one filled with water): 200s

(a) What can you conclude about the property of water based on the experiment?(1 mark)
(b) Explain the difference in time taken for the balloons to pop.(2 marks)
State a variable that he must keep constant to conduct a fair test.(1 mark)

[Michaelia0816]

May I know if polar bear coverings it’s brown nose a structural or behavioral ?


I think it is behavioural.

[BeContented]

Little Einstein:

BeContented:

DS says all along his understanding is :


During germination, oxygen, water & warmth is required.
But his Mindstretcher teacher says that during germination, oxygen is not required. Only when the leaves start then oxygen is required.

Errhhh....now he's confused. Anyone can help confirm?

Oxygen is definitely needed. How come Mindstretcher teaches him the wrong concept!
It is just that sunlight is needed when the first leaves appeared.

I am the main science tutor in my centre and i have been teaching Science for the last 12 years! Such mistake cannot be made! :mad:

Hi. Thanks a lot for the verification. I will double check with my son & his tuition-mates one more time to make sure before I feedback MS on this.

[tianzhu]

Happygolucky:

I have a question from 2011 Catholic High Prelim 2, question 41.

It came with a picture but I have no idea how to post picture. Nonetheless, the question is as follows:

Steve wanted to test the properties of water and air. He placed 2 balloons of the same types, one completely filled with air only and the other completely filled with water and placed them over a candle flame. He lit the candle and observed what happened.

he recorded the time take for the balloon to pop.
Set up A(the one filled with air): 2 sec
Set up B(the one filled with water): 200s

(a) What can you conclude about the property of water based on the experiment?(1 mark)
(b) Explain the difference in time taken for the balloons to pop.(2 marks)
(c) State a variable that he must keep constant to conduct a fair test.(1 mark)

Hi

You may wish to take a look at the answers in the ws.

Please go to page page 43/44.

http://www.orlesson.org/orp/11Sc/2011-P6-Science-SA2-CHS.pdf

Best wishes

[Michaelia0816]

Help! MayI know the feature of penguin’s outer covering which protect it from environment and predator?

[mlim321]

Little Einstein:

BeContented:

DS says all along his understanding is :


During germination, oxygen, water & warmth is required.
But his Mindstretcher teacher says that during germination, oxygen is not required. Only when the leaves start then oxygen is required.

Errhhh....now he's confused. Anyone can help confirm?

Oxygen is definitely needed. How come Mindstretcher teaches him the wrong concept!
It is just that sunlight is needed when the first leaves appeared.

I am the main science tutor in my centre and i have been teaching Science for the last 12 years! Such mistake cannot be made! :mad:

During germination, there is no leaves, thus, no stomata is present. Without stomata, how does the seedling undergo respiration?

very confused.... please enlighten. Thanks.

[bestwishes]

Michaelia0816:

Help! MayI know the feature of penguin's outer covering which protect it from environment and predator?

Counter-shading... Answers & explanation can be found in pg 357 qns 11 and 12 upper block sc frequently asked qns by eph (green cover with praying mantis)