Q&A - P4 Science

[Jamesbond]

Rubber is used for car tyres....Give a reason why it is used?


Will u say It is strong or it is waterproof.....Becos they r just asking a reason..what will b the priority? Pl hlp.. :yikes:

[Jamesbond]

teh_oh:

Hi,

Appreciate assistance on the following:-

Q: The female mosquito sucks blood so that she has enough energy to lay eggs. True/False

Child's Ans: False (because she sucks blood for nutrients, not energy)
Ans Key: True
___________________________________________

Q: Why is air classified as matter?
A: Has mass
B: Occupies space
Can be compressed

Child's Answer: A and B
Ans Key: A, B and C
_____________________________________________

http://i42.tinypic.com/17efxj.jpg\">

Child's Answer : 4
Ans Key: 2
Why?

Thanks!

can anybody clear the first two questions...No proper explanations so far...

[Niedino]

Jamesbond:

http://i45.tinypic.com/29uq6mf.jpg\">


Pl help me answer

Hi Jamesbond,

I would say (4), since the germination is in a dark cardboard, so the food in the seed leaf would all be used up.

Hope it helps!

[Jamesbond]

Niedino:

Jamesbond:

http://i45.tinypic.com/29uq6mf.jpg\">


Pl help me answer

Hi Jamesbond,

I would say (4), since the germination is in a dark cardboard, so the food in the seed leaf would all be used up.

Hope it helps!

But the answer given was (3). Dats y I had confusion. R u sure abt ur answer....Pl help....

[atutor2001]

Jamesbond:

But the answer given was (3). Dats y I had confusion. R u sure abt ur answer....Pl help....

Hi Jamesbond,

I think the answer depends on the definition for \"completion of germination\".

At higher level, germination is deemed to have completed when the radicle (root) appears. With this definition, the answer should be A & B.

In most primary level materials, germination is shown to be completed when first pair of real leaves open up. For this definition, A, B, C will be the most appropriate answer.

Finally, I have also come across some assessment books and teachers stating that germination is completed when the seed leaves withered and dropped off. With that, A, B, C, D is the best answer.

I will pick A, B & C as the answer as that is the most commonly found definition for completion of germination i.e. when the first pair of leaves open up. Maybe you would like to check with the text book to confirm which definition is taught in primary school.

[Michaelia0816]

I think it is 4 too.

[Jamesbond]

Michaelia0816:

I think it is 4 too.

Thank u all for ur explanations....Great work..... :salute:

[Michaelia0816]

You’ re welcome, I should thank you instead, I also forgotten that life cycle… Can be found in my PSLE

[Jamesbond]

http://i46.tinypic.com/ne9n4z.jpg\">


Hi,

For the b Questn... Tree B roots were long and anchored tightly to the ground during the storm while Tree A roots were short nd could not hold onto the ground tightly.

Think this is correct. If wrong pl correct me.

But for the c Questn...can somebody give me the answer.....

Thanks in advance.

[Champion]

Jamesbond:

http://i46.tinypic.com/ne9n4z.jpg\">


Hi,

For the b Questn... Tree B roots were long and anchored tightly to the ground during the storm while Tree A roots were short nd could not hold onto the ground tightly.

Think this is correct. If wrong pl correct me.

But for the c Questn...can somebody give me the answer.....

Thanks in advance.

Ans: (B) - Roots take up water and minerals, such as nitrogen and sulfur, from the soil.