Q&A - PSLE Science

[fightingmom]

Michaelia0816:

Guy, help, this is the web for the photo


http://t.co/O0PUHfF8

the answer is (4).

The oil prevents the leaves from losing water through the stomata. Hence, the more surface of the leaf is painted with oil, the lesser water loss for the leaf.

[Michaelia0816]

Thx for the answer and the reasons!

[Niedino]

Michaelia0816:

Guy, help, this is the web for the photo


http://t.co/O0PUHfF8

Hi Michaelia,

Fightingmom is right. To provide a more detailed explanation, more stomata is found on the underside of the leaf as compared to the top side of the leaf. Thus, there is more water loss through transpiration (causing a drop in mass) of the leaf with its bottom side covered in oil as compared to the one with its top side covered in oil.

Hence the answer is option 4 and not 2. Test your child on why it is not 2, and explain to your child using this reason.

Hope this helps!

Niedino

[G Tan]

Michaelia0816:

Guy, help, this is the web for the photo


http://t.co/O0PUHfF8

This question is in pslebooklet

[Studious Alien]

Can someone please help me with this question?


Which two materials, metal or plastic, would be better to be used to make a container which is supposed to keep food warm? Why?

TIA

[ms_lim]

Can help me with the question below :


http://i47.tinypic.com/2zfvjv7.jpg\">
Ans key is 3

[ms_lim]

Can help to explain below question :


http://i47.tinypic.com/2ikqcz5.png\">

Ans key is 1 but DS ans is 2

[ms_lim]

Can help me to explain below question :


http://i47.tinypic.com/25fq6jd.png\">
http://i46.tinypic.com/30lp43s.png\">
Ans key is 2. Why is image D not a possible shadow?

[G Tan]

ms_lim:

Can help me with the question below :


http://i47.tinypic.com/2zfvjv7.jpg\">
Ans key is 3

Answer is 4

[whitety]

G Tan:

ms_lim:

Can help me with the question below :


http://i47.tinypic.com/2zfvjv7.jpg\">
Ans key is 3

Answer is 4

I thought tadpoles eat algae so I googled and found this.

\"When a wild pond tadpole is newly hatched, the first thing it will eat is its egg jelly. As they get a little bigger and start to develop they will nibble on pond algae that grows in the shallows of the pond along the edges. They will also move onto larger leaves or the stems of nearby plants. When they are a little bigger and developed they will adapt a more carnivorous diet by eating dead fish, dead tadpoles or worms.\"

So answer may be 3.