Q&A - PSLE Science

[kuts]

Robertpattinsonidle:

kuts:

Hi,


Can anybody explain wat is the difference between cell division and budding

budding is only for yeast. cell division is for all cells except red blood cell.
thanks,
robertpattinsonidle ft.JB

Tks a lot for the explanation

[charsen]

I am not convinced with options 1 and 2.Anybody has a better explanation?

[smurfalone]

Need help :-

NY 2010 SA2 #15

http://i47.tinypic.com/23laxia.jpg\">
Answer key is 1 - is it correct ?

[smurfalone]

Need help :-

NY 2010 SA2 #18

Asnwer key is (1), is it correct ? My guess is (2)
http://i48.tinypic.com/2zozw9e.jpg\">

[charsen]

smurfalone:

Need help :-

NY 2010 SA2 #18

Asnwer key is (1), is it correct ? My guess is (2)
http://i48.tinypic.com/2zozw9e.jpg\">

Ans (1) Heat energy (from sun) --> Light energy

[verykiasumummy]

smurfalone:

Need help :-

NY 2010 SA2 #15

http://i47.tinypic.com/23laxia.jpg\">
Answer key is 1 - is it correct ?

hi smurfalone,

yes ans is 1. (A and B)

A) flower will attract pollinators to it = promotes animal pollination.
B) flower has nectar = attracts animals to eat.
C) anther shorter than stigma = shows pollen grains will be brushed on animals when they are feeding on their nectar. (but pollen grains brushed on these animals will help to pollinate other flowers when the animals go to other flowers, not the same flower)
D) stigma sticking out = shows stigma easily pollinated by wind.

so only A and B, ans = 1.

[verykiasumummy]

smurfalone:

Need help :-

NY 2010 SA2 #18

Asnwer key is (1), is it correct ? My guess is (2)
http://i48.tinypic.com/2zozw9e.jpg\">

answer should be 2.

the light rays from the sun pass through the magnifying glass, enabling the magnifying glass to concentrate the light rays onto a point on the paper, as light energy converts to heat energy and cause the paper to catch fire and burn.

[Robertpattinsonidle]

charsen:

I am not convinced with options 1 and 2.Anybody has a better explanation?

i think i get it. u see wen there is no mouse, then there will be more food for rabbit, and goat to it so they will increase. this will also increase the no. of secondary consumers so more lions. thanks

robertpattinsonidle ft.JB

[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
___________ >____________>__________?

[mumthebest]

The leaves of a potted plant were completely covered with grease. The plant dies after sometimes as the leaves are not able to take in ________.

a) carbon dioxide
b) oxygen
c) sunlight
d) water

1) a and b only
2) c and d only
3) a, b and c only
4) b, c and d only