Q&A - PSLE Science

[Robertpattinsonidle]

ms_lim:

charsen:

[quote=\"ms_lim\"]Can help to explain this question? Ans key is 1


http://i50.tinypic.com/nt2k4.jpg\">

Hi
Your DS answer which is 3,is correct.Option 4 is not the answer as the snails may have eaten up the plant.You can say option 4 when they show the observation in each day that the snails is eating the plant.I would say not possible to tell.
Option 1;Double confirm it is wrong.Only plants,not animals,need light to survive.
Option 2 is wrong as we do not know whether snails eat plants.That also comes under not possible to tell.

Thus,answer 3 is correct.
Cheers

Charsen, thanks so much for your explanation.[/quote]Sorry Charsen and Ms_lim. I would like to ask, why is it that the 1st container would not survive? There is air water and light for the plant, so why is it that the organisms in the 1st container will not survive? Sorry to disturb!thanks.

[Michaelia0816]

Michaelia0816:

Sorry for posting the wrong questions!

Charsen, this question is super tricky,
Is it (1) or (2), I stucked at the shape B and C.

Link:
http://t.co/4rJYMpyB

Pls explain.


Link:
http://t.co/2jAm71ow

:scratchhead:

[charsen]

Michaelia0816:

Michaelia0816:

Sorry for posting the wrong questions!

Charsen, this question is super tricky,
Is it (1) or (2), I stucked at the shape B and C.

Link:
http://t.co/4rJYMpyB

Pls explain.


Link:
http://t.co/2jAm71ow

:scratchhead:

Hi
First question.You know that the nearer the object is near the light source,the bigger the shadow casted.In this case,the ring is big.Thus,A should be the ring.The next biggest is the rectangle reason is if a shape lies on the rectangle shadow,it means the rectangle is bigger.Answer is 2.

Second question.Topic:environment Concept:types of soil
a)The spaces between the large sand particles in setup A are larger than the small sand particles,so water can flow more quickly through the sand particles in set-up A and can be collected in the beaker.

b)Beng Hock wanted to trap the smaller impurities present in the water from the river which could only be done using the find sand as the space between the sand particles are smaller and trap the impurities.

c)No.Clear water can still contain harmful micro organisms like bacteria that can harm us when we drink the water.
Cheers

[charsen]

Hi Robertpattinsonidle

In the night,both the snails and the water plant would compete for dissolved oxygen.Since this would happen for a month,the snails would eventually die before the water plants die.There would be more dissolved oxygen than dissolved carbon dioxide ,thus the plants would die due to the lack of dissolved oxygen.
Cheers

[Zhu99]

ms_lim:

Can help to explain this question? Ans key is 1


http://i50.tinypic.com/nt2k4.jpg\">

(1) Living things need light to survive. --- Wrong since organisms in P do not survive after 1 month.

(2) Living things need food to survive --- Wrong since Q shows that plants make their own food (in the presence of light).

(3) Plants can make food in the presence of light --- Correct Q vs S.

(4) There is insufficient dissolved oxygen in the water - Wrong since the plants in Q survive after 1 month.

So the correct answer is (3).

[Clairifina]

In terms of food storage, how is a carrot plant different from a ginger plant?

[charsen]

Clairifina:

In terms of food storage, how is a carrot plant different from a ginger plant?

Hi
In terms of food storage,Both are the same.Carrot plant stores its food in its stems and ginger plant also stores its food in the stem,which we use for cooking.
Cheers

[Nebbermind]

charsen:

Clairifina:

In terms of food storage, how is a carrot plant different from a ginger plant?

Hi
In terms of food storage,Both are the same.Carrot plant stores its food in its stems and ginger plant also stores its food in the stem,which we use for cooking.
Cheers

i thought the orange part of the carrot is its root? :scratchhead:

[Zhu99]

Clairifina:

In terms of food storage, how is a carrot plant different from a ginger plant?

Carrot stores food in its roots while ginger stores food in its stems.

[charsen]

charsen:

Clairifina:

In terms of food storage, how is a carrot plant different from a ginger plant?

Hi
In terms of food storage,Both are the same.Carrot plant stores its food in its stems and ginger plant also stores its food in the stem,which we use for cooking.
Cheers

Correction.
Carrots store food in its roots,which is the part we eat and ginger is the stem since it is an underground stem.
Cheers