Q&A - PSLE Science

[charsen]

Michaelia0816:

Hi Charsen! Thanks! For your help, now I understood the balloons question. go and check my pervious post, I edited it again, you can access it now, the link 4! Sorry for the link 4 inconvience given.

Pls forgive my typo error.

Hi
Did you check before posting.reason is You only posted only the question this time and not the diagram.
I hope that you would do well in free response questions based on my advice.
Cheers.

[Michaelia0816]

I give you the Q39, but I give them separately, in pictures and questions as I do not have enough space to photo, otherwise it will be too small to read.


The pictures is on top of the questions.
Links:
Pictures---- http://t.co/LxBxJszu
Questions-- http://t.co/0wPRPxTf

The ORGANISM X question, is about the parts in it, right?

[charsen]

Michaelia0816:

I give you the Q39, but I give them separately, in pictures and questions as I do not have enough space to photo, otherwise it will be too small to read.


The pictures is on top of the questions.
Links:
Pictures---- http://t.co/LxBxJszu
Questions-- http://t.co/0wPRPxTf

The ORGANISM X question, is about the parts in it, right?

Hi
For the organism X Question,you are right.And remember,to compare the parts with the fish.
For Q39,the question is quite tricky.
For a)The light source shines on the light trap when there is no smoke blocking the light path.Thus,light is not reflected to the light sensor.When there is smoke,it will block the light's path between the light source and the light trap.Therefore,light would be reflected to the light sensor.Since the light sensor detected more light than normal,it would set off the alarm.

b)The smoke detector could not differenciate between smoke and the large cloud of flour.It only alarms as long the light path is blocked and the light is reflected to the light sensor.Since the large cloud of flour is blocking the light path,the alarm was set off.

I am a PSLE student and my niche area is science.Thus,if there is something wrong in my answer,please bear it.I will try not to make mistakes.
Cheers

[Fat Mama]

Hi,


Can a single (one) lizard be counted as a population on a plant?

Teacher said need at least 2 to be a population. Is it true?

Tks

[Michaelia0816]

Since you also a PSLE student, I can still correct your spelling, use distinguish instead of differentiate, it might be more specific.

[Michaelia0816]

Ops, I forgot to thank you. Thank you Charsen.

[Michaelia0816]

Fat Mama:

Hi,


Can a single (one) lizard be counted as a population on a plant?

Teacher said need at least 2 to be a population. Is it true?

Tks

Yes, of course. Anything at least one is a population, except it is same kind but different stage of life cycle.

[charsen]

Fat Mama:

Hi,


Can a single (one) lizard be counted as a population on a plant?

Teacher said need at least 2 to be a population. Is it true?

Tks

No.
It could be considered as only a living organism.A population is considered 2 or more of the same species living in the same community.The young of the species is also considered in the population.Therefore,your teacher is absouletely right.
cheers

[Michaelia0816]

Ok, I thought a population is make up at least 1, I learnt something new again!

[Fat Mama]

charsen:

Fat Mama:

Hi,


Can a single (one) lizard be counted as a population on a plant?

Teacher said need at least 2 to be a population. Is it true?

Tks

No.
It could be considered as only a living organism.A population is considered 2 or more of the same species living in the same community.The young of the species is also considered in the population.Therefore,your teacher is absouletely right.
cheers

Tks charsen