Q&A - P3 Science

[teh_oh]

tianzhu,

Thank you.

[tianzhu]

teh_oh:

tianzhu,

Thank you.

Hi

You're welcome.

Best wishes

[usaik]

Hello....I need help to understand the concept and why the expected answer to the question for part (b) below.


This is how the question goes:
http://postimage.org/image/2673bkczo/

This is the given answer :
http://postimage.org/image/2jfzm7tc4/

With reference to part (b), the answer seems to be just repeating what the graph is showing instead of explaining why organ S has the most amount of food digested. Is this the expectation in an answer for all such questions? ** Please help ****

[tianzhu]

Hi usaik


In PSLE Science, students learned that the digestive system comprises the:

-Mouth
-Gullet
-Stomach
-Small intestine
-Large intestine
-Anus

Digestion begins in the mouth. It is completed in the small intestine.

The question asks a student to explain why and one is expected to give the reason/cause on why something happened.

My suggestion is to keep within the syllabus. I think it’s good enough to explain that more digested juices are added in the small intestine and digestion is completed in the small intestine.

(My answer is based on information from the old edition of PSLE Science Guide, please refer to your current textbook/guidebook to see if more information is added)

Merry Christmas and a Happy New Year.

Best wishes

[usaik]

Hi Tianzhu,


Thank you so much for taking time to provide all the explanation. Looks like the answer key is not to be trusted fully.

MERRY XMAS & A HAPPY NEW YEAR TO YOU TOO!!!

[janet88]

In my opinion, it’s rather difficult to score high marks in Section B (open-ended questions)…just wondering how I can help son to improve.

He does well in MCQ but teachers are very particular with answers in open-ended.

There was a question on Maglev train in P4 SA2 paper. The students were asked to state 2 advantages of using magnets used in Maglev train. Hubby & I read the answer given by teacher and just couldn’t understand it.

[usaik]

Hi Janet_lee88,

My son did badly for the open-ended qns too. I am still figuring out how to help him too. For a start, I am trying to figure out the questions and answers for myself.

Can you share the answers given by the teacher for the Maglev train question?

[janet88]

usaik:

Hi Janet_lee88,

My son did badly for the open-ended qns too. I am still figuring out how to help him too. For a start, I am trying to figure out the questions and answers for myself.

Can you share the answers given by the teacher for the Maglev train question?

Q: What are the 2 advantages of using electromagnets over permanent magnets in the magnetic levitation train?

Teacher's answer: 1) We can control the strength of the magnet.
2) We can switch on and off the electricity when we want the train to stop or move.

[Tang]

usaik:

Hello....I need help to understand the concept and why the expected answer to the question for part (b) below.


This is how the question goes:
http://postimage.org/image/2673bkczo/

This is the given answer :
http://postimage.org/image/2jfzm7tc4/

With reference to part (b), the answer seems to be just repeating what the graph is showing instead of explaining why organ S has the most amount of food digested. Is this the expectation in an answer for all such questions? ** Please help ****

Hi,

The answer given for part (b) is correct as we are expected to make use of the graph to explain the reason.

If we mention more digestive juices and so more food digested, it will be marked wrong since the graph does not show digestive juices.

[tianzhu]

usaik:

Hi Tianzhu,


Thank you so much for taking time to provide all the explanation. Looks like the answer key is not to be trusted fully.

MERRY XMAS & A HAPPY NEW YEAR TO YOU TOO!!!!!

Hi

You're welcome.

I don’t think the WS’s answer is wrong in this particular instance.In answering this question, we still need to mention the higher proportion of digested food in organ S as shown in the graph.Just that we may feel that additional information is needed to ensure a more complete answer.

Organ S. The amount of digested food is the highest as compared to the other organs. More digested juices are added in the small intestine and digestion is completed in the small intestine.

Best wishes