PSLE 2012 - Science

[Studious Alien]

biniv300:

fantasy1:

HI


How abt section (B) qn
Something abt the type of colour used for photosynthesis. For Part (C) when they removed the water plants, what observation will the person see to ensure result at part (B) is correct?

My ans is he should see which section the fishes swam

Is my ans correct?

My friend says my ans is correct and tis ques came in a schools 2009 prilim

Shouldn't you say what is going to be observe and not what you should be observing?

[Concerned student]

777:

fantasy1:

a only - swollen stem

(b) short root
(c) broad leaves

she chose only (a)

I also chose swollen stem

I also

[parent111]

Concerned student:

777:

[quote=\"fantasy1\"]a only - swollen stem

(b) short root
(c) broad leaves

she chose only (a)

I also chose swollen stem

I also [/quote]My(a)

[HopeGrace]

:salute:

777:

fantasy1:

a only - swollen stem

(b) short root
(c) broad leaves

she chose only (a)

I also chose swollen stem

me too! :salute:

[ultimateschooler]

Fishes die

[kiasuursula]

biniv300:

fantasy1:

HI


How abt section (B) qn
Something abt the type of colour used for photosynthesis. For Part (C) when they removed the water plants, what observation will the person see to ensure result at part (B) is correct?

My ans is he should see which section the fishes swam

Is my ans correct?

My friend says my ans is correct and tis ques came in a schools 2009 prilim

Can the ans be:
The number of fish in each section.

[GLORYmum]

Where is Charsen ah???

[DragonWarrior2000-2012]

Concerned student:

777:

[quote=\"fantasy1\"]a only - swollen stem

(b) short root
(c) broad leaves

she chose only (a)

I also chose swollen stem

I also [/quote]Can't be short roots 'coz they will grow deep into the soil to collect more water and mineral salts.Broad leaves is also wrong as broad=more exposed surface area.Thus,the stomata will tend to lose more water.Remember,this Plant H lives in a desert-a hot and humid place.

[DragonWarrior2000-2012]

GLORYmum:

Where is Charsen ah???

:offtopic:

[RVHS]

thesjarox:

vaidyanathan padmini:

How about friction question from McQ.....

My dd's answer is only C as friction opposes motion...
Only the box in c is moving so it should have friction

Confirmed with teacher-A,B and C.
Friction also acts on stationary objects. That's why forces have to overcome the friction before being able to move the object. Also, if there were no friction acting on an object,the object would glide across the surface, like ice, and would never stop.
Thus, A is also correct.

The force of friction is always exerted in a direction that opposes movement or potential movement between the two surfaces,
For B: Potential movement
For Movement
For A: non
So answer should be: B &C