Q&A - P3 Science

[Niedino]

teh_oh:

Hi,

I am hoping to find out if my child's sentence answer is correctly worded:-

Q: Can the snake be placed in the classification chart above? Explain your answer.

A: Child's Ans: No. It has no legs.
Ans Key: No. It does not have any legs.

\"It has no legs\", is it a correct sentence from an English point of view (although meaning is same).

Hi teh_oh,

Yes, the answer is correct, but a better answer would be to include a comparison, e.g. It does not have legs, unlike the animals in the box.

The skill of comparing is tested in this question, so it would be good if your child can put it into the answer. Hope it helps!

[teh_oh]

Niedino:

teh_oh:

Hi,

I am hoping to find out if my child's sentence answer is correctly worded:-

Q: Can the snake be placed in the classification chart above? Explain your answer.

A: Child's Ans: No. It has no legs.
Ans Key: No. It does not have any legs.

\"It has no legs\", is it a correct sentence from an English point of view (although meaning is same).

Hi teh_oh,

Yes, the answer is correct, but a better answer would be to include a comparison, e.g. It does not have legs, unlike the animals in the box.

The skill of comparing is tested in this question, so it would be good if your child can put it into the answer. Hope it helps!

Hi Niedino,
:thankyou: too.
Thanks for suggesting to use 'unlike'. Although I overlooked the comparison technique in the above question (because it looked so straightforward!), our typical comparison answer technique is 1. to state characteristics of Group; 2. state characteristics of subject; 3. state why.
ie. No. Animals in Group X has legs. The snake does not have legs so it cannot be placed in the chart above. (grandmother story....)

[Niedino]

bookwormkids:

teh_oh:

[quote=\"shirley.tamzil\"]Need help with the following question:


Tommy spread a layer of wax on different parts of four similiar plants A, B, C and D as stated below. The was prevents the plants from exchanging gases with the surroundings.

Part of plant where wax is applied:
Plant A - Upper surface of leaves
Plant B - Stem
Plant C - Lower surface of leaves
Plant D - Upper and lower surface of leaves.

He watered the plants daily and placed them beside a sunny window. After a week, he noticed that two of the plants wilted first. Which of the following are most likely to be the two plants?

1. A and B
2. A and C
3. A and D
4. C and D

Hi,
Is this P3 Question?
Is the answer 3?

This is question from P4 Sample Exam Paper, DS answered 3, but answer sheet says 4. :?
Anyone can confirm the answer?[/quote]Hi,
Sorry for embarrassing myself here. My child is only in P3. :oops:
I did a quick search on the internet and read about plants using stomata to breathe. These stomata are shown to be on the underside of the leaf (http://www.saburchill.com/chapters/chap0025.html). Maybe that is why the answer key is 4.
Hope someone can help us.
On a side note, won't the wax interfere with photosynthesis and kill the plants too?[/quote]

Hi! Answer is 4 (C&D). My P4 kid's answer:

Plants use leaves to exchange gases with the surrounding. Stomata are found on leaves and most of them are found on the underside of leaves. Thus, if wax is applied on the upper & lower side of the leaves, the leaves will not be able to \"breathe\" or exchange gases or photosynthesize. The plant will wilt and die eventually.

HTH. :)[/quote]

Hi,

For the first question, the answer should be 4, as most of the stomata are found on the underside of the leaves. Hence, if the lower surface is coated with wax, the plant is unable to exchange gases for respiration and photosynthesis.

However, please take note that we do not use the word 'breathe' for plants. If you were to use a dictionary definition, breathing involves the inhaling and exhaling of air through the 'lungs'. Plants have no lungs, so technically, they do not breathe. Often pupils who put 'plants breathe' will get penalised. The best words to use are 'exchange gases' or 'respire'

[teh_oh]

Hi all,

Just to vent...
For a certain question that involved keeping a hamster in a cage without sufficient food and water, resulting in the death of the rodent in a few days time, a question was asked to state reason. My child's answer:
\"The hamster does not have enough food and water, so it eventually starved to death.\"
No full marks awarded.

For a different question to state why a mushroom is not a plant, my child's answer:
\"A plant can make food by itself while a mushroom feeds on other organism.\"
No full marks awarded too.

:frustrated:

[corneyAmber]

teh_oh:

Hi all,

Just to vent...
For a certain question that involved keeping a hamster in a cage without sufficient food and water, resulting in the death of the rodent in a few days time, a question was asked to state reason. My child's answer:
\"The hamster does not have enough food and water, so it eventually starved to death.\"
No full marks awarded.

For a different question to state why a mushroom is not a plant, my child's answer:
\"A plant can make food by itself while a mushroom feeds on other organism.\"
No full marks awarded too.

So what is the full marks answers for both questions?
:frustrated:

[teh_oh]

ksi:

teh_oh:

Hi all,

Just to vent...
For a certain question that involved keeping a hamster in a cage without sufficient food and water, resulting in the death of the rodent in a few days time, a question was asked to state reason. My child's answer:
\"The hamster does not have enough food and water, so it eventually starved to death.\"
No full marks awarded.

For a different question to state why a mushroom is not a plant, my child's answer:
\"A plant can make food by itself while a mushroom feeds on other organism.\"
No full marks awarded too.

So what is the full marks answers for both questions?
:frustrated:

Hi Ksi,
The teacher said that for the hamster question, the child's answer is an 'English' answer and not a 'Science' answer. Her answer is
\"The hamster does not have enough food and water to survive.\"

For the second question, the child need to compare.
\"A plant can make food by itself while a mushroom feeds on other organism.\" is not an effective comparison. Her answer is
\"A plant can make food by itself while a mushroom cannot. A mushroom feeds on other organism.\"

:frustrated:

[shirley.020816tamzil]

Need help with the below question:


Which of the following statements about heat is correct?
1. Heat travels in a straight line.
2. A thermometer is used to measure the amount of heat of an object.
3. When one object is placed on top of another, the object on top will gain heat because heat rises.
4. At the same temperature, a dark colored object will give out more heat than a light colored object.

[tianzhu]

shirley.tamzil:

Need help with the below question:


Which of the following statements about heat is correct?
1. Heat travels in a straight line.
2. A thermometer is used to measure the amount of heat of an object.
3. When one object is placed on top of another, the object on top will gain heat because heat rises.
4. At the same temperature, a dark colored object will give out more heat than a light colored object.

Hi

I am more inclined to go for option (4).

If you go through the concepts of heat learned in lower primary science, you’ll realise that options 1 to 3 are offside. Going through the process of elimination, you’re left with option (4).

Dull black surfaces are better emitters of infrared radiation than shiny white surface.

Take for example, in a thermos flask, the wall of the glass are silvered to reflect the radiant heat back to the hot liquid so as to minimise heat loss through radiation.

I am not too sure if radiation is covered in the primary science syllabus, but you should be able to learn more about it from secondary science textbooks.

Best wishes

[cimman]

shirley.tamzil:

Need help with the below question:


Which of the following statements about heat is correct?
1. Heat travels in a straight line.
2. A thermometer is used to measure the amount of heat of an object.
3. When one object is placed on top of another, the object on top will gain heat because heat rises.
4. At the same temperature, a dark colored object will give out more heat than a light colored object.

I would say 3.
1. Heat does not travel in a straight line. It radiates in all direction.
2. Thermometer measures the temperature of heat. Amount of heat is measured in Specific Heat, expressed in Joules / Kelvin, which is a relationship between energy and temperature.
3. Dark objects or black body objects absorbs heat energy.

[cimman]

tianzhu:

shirley.tamzil:

Need help with the below question:


Which of the following statements about heat is correct?
1. Heat travels in a straight line.
2. A thermometer is used to measure the amount of heat of an object.
3. When one object is placed on top of another, the object on top will gain heat because heat rises.
4. At the same temperature, a dark colored object will give out more heat than a light colored object.

Hi

I am more inclined to go for option (4).

If you go through the concepts of heat learned in lower primary science, you’ll realise that options 1 to 3 are offside. Going through the process of elimination, you’re left with option (4).

Dull black surfaces are better emitters of infrared radiation than shiny white surface.

Take for example, in a thermos flask, the wall of the glass are silvered to reflect the radiant heat back to the hot liquid so as to minimise heat loss through radiation.

I am not too sure if radiation is covered in the primary science syllabus, but you should be able to learn more about it from secondary science textbooks.

Best wishes

I would say (3) because there is transfer of heat via conduction (top object touches bottom object), something a primary school student should be familiar with. Radiated heat would not be something they're familiar with at this point in time. So between a concept that they have learnt and something that they will only learn in Secondary school, (3) seems most approriate.