Q&A - P3 Science

[Champion]

atutor2001:

Hi Champion


Thank you for making a copy of the assessment book.

Out of curiosity, I googled for spore bags and there is only 1 site that called spore cases as spore bags - interestingly it is a local site.

In fact, many sites used the term \"spore bags\" to describe special man-made bag used for growing mushroom.

From the web-dictionary, the definition of \"spore cases\" is given as sporangium which is defined as

\"A single-celled or many-celled structure in which spores are produced, as in fungi, algae, mosses, and ferns. Also called spore case.\"

So I really wonder if the term spore bag is correct.

Cheers

Hi atutor2001,
Thanks for the explanation; appreciates much :celebrate:

Yes, indeed - I was surprised when I saw this term in this forum and later on found in this assessment book :shock: ....so for the time being, I am continuing to \"cold storage\" this book until further notice! :rotflmao: :laugh:

[Champion]

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Hello All,
Need the trouble you all again :hi5:

The above question is taken from Longman My Weekly Companion Science Book A.

Q3a, \" Why did the bettle die?\"

DD1 argued that the answer given at the back of the answer sheet is wrong! :scratchhead: :? She \"challenged\" me :scared: - took out the Science Exam Booster Notes and showed me on the page under \"Characteristics of living things\" - Living things can stay alive for about 3 weeks without food. :shock:

Errrr........ :?: :?:

[atutor2001]

The beetle happens to have been starving for 2 weeks prior to the start of the experiment. :rotflmao:

[Concerndad]

Hi…


Both the answer key n your daughter is right…

We must help our children to understand certain differences between test/exam qns compared with facts given in science guide…

The test qns is testing the child knowledge of the characteristic of living things. Hence we must answer according. In fact…eventually the beetle will still die to lack of food.

One thing, we can learn from here, is the time factor involve in the qns…if the qns does not give a time limit…like eg. Within a day…or a few day…or a few hours later…then we can give the answer as the beetle would die. But otherwise, we must answer it as…the beetle will still live because living thing can survive for awhile without food.

[Champion]

Concerndad:

One thing, we can learn from here, is the time factor involve in the qns..if the qns does not give a time limit...like eg. Within a day..or a few day..or a few hours later...then we can give the answer as the beetle would die. But otherwise, we must answer it as...the beetle will still live because living thing can survive for awhile without food.

Hi Concerndad,
Thanks so much for your analysis; appreciates much :thankyou:

But looking back to the question, the statement before it, \"After one week, he noticed that the beetle had died.\" This was the tricky part that my DD1 \"challenged\" me :scared:

[Concerndad]

Oops..missed out on that statement...paiseh :imsorry:


I have made a check..your daughter is right..a beetle can survive without food for 3weeks.

Hence there may be a flaw in the qns itself...

Hope this help.

[Champion]

Concerndad:

Oops..missed out on that statement...paiseh :imsorry:


I have made a check..your daughter is right..a beetle can survive without food for 3weeks.

Hence there may be a flaw in the qns itself...

Hope this help.

Hi Concerndad,
Once again; :thankyou: very much for your explanation :hi5:

[teh_oh]

Hi parents,

Referring to Conquer Science 3/4 Question,
Q) Study the classification table below:
Materials
Magnetic Metals - iron nail, steel screw, nickel coin
Non-magnetic Metals - aluminium foil, brass fixture, gold ring
Which of the following has been placed in the wrong category?
1) aluminium foil
2) nickel coin
3) brass fixture
4) gold ring
Answer Key: (3)

Q1) Is brass magnetic or non-magnetic metal?
Wiki state that brass is not ferromagnetic. In that case brass fixture is in the correct category above, so is the answer in the answer key above wrong?

According to EPH Ultimate Science page 473, it is stated
"All non-metals are non-magnetic, such as plastics, paper, clay, brass, water etc".
Q2) Is brass metal or non-metals???
Wiki state that it is a metal.

Appreciate any help.

[atutor2001]

teh_oh:

Hi parents,

Referring to Conquer Science 3/4 Question,
Q) Study the classification table below:
Materials
Magnetic Metals - iron nail, steel screw, nickel coin
Non-magnetic Metals - aluminium foil, brass fixture, gold ring
Which of the following has been placed in the wrong category?
1) aluminium foil
2) nickel coin
3) brass fixture
4) gold ring
Answer Key: (3)

Q1) Is brass magnetic or non-magnetic metal?
Wiki state that brass is not ferromagnetic. In that case brass fixture is in the correct category above, so is the answer in the answer key above wrong?

According to EPH Ultimate Science page 473, it is stated
\"All non-metals are non-magnetic, such as plastics, paper, clay, brass, water etc\".
Q2) Is brass metal or non-metals????
Wiki state that it is a metal.

Appreciate any help.

To answer your questions first :
Q1 Brass is non-magnetic as it does not contain any magnetic element (a mixture (alloy) of copper & zinc)
Q2 Brass is a metal.

It is NOT true that all non-metals are non-magnetic. Carbon is a non-metal but it is magnetic and it also can conduct electricity.

I believe that the answer (3) is correct. The main classification should be magnetic & non-magnetic. It should then branch into \"Element\" and \"Alloy\". There are 2 alloys in the list, steel and brass. Brass must have been placed together with aluminium & gold - it should be under alloy.

If steel is placed in the same group as iron and nickel, then there is mistake in the question. Steel should be in a separate group under \"magnetic\"

[teh_oh]

atutor2001:

teh_oh:

Hi parents,

Referring to Conquer Science 3/4 Question,
Q) Study the classification table below:
Materials
Magnetic Metals - iron nail, steel screw, nickel coin
Non-magnetic Metals - aluminium foil, brass fixture, gold ring
Which of the following has been placed in the wrong category?
1) aluminium foil
2) nickel coin
3) brass fixture
4) gold ring
Answer Key: (3)

Q1) Is brass magnetic or non-magnetic metal?
Wiki state that brass is not ferromagnetic. In that case brass fixture is in the correct category above, so is the answer in the answer key above wrong?

According to EPH Ultimate Science page 473, it is stated
\"All non-metals are non-magnetic, such as plastics, paper, clay, brass, water etc\".
Q2) Is brass metal or non-metals????
Wiki state that it is a metal.

Appreciate any help.

To answer your questions first :
Q1 Brass is non-magnetic as it does not contain any magnetic element (a mixture (alloy) of copper & zinc)
Q2 Brass is a metal.

It is NOT true that all non-metals are non-magnetic. Carbon is a non-metal but it is magnetic and it also can conduct electricity.

I believe that the answer (3) is correct. The main classification should be magnetic & non-magnetic. It should then branch into \"Element\" and \"Alloy\". There are 2 alloys in the list, steel and brass. Brass must have been placed together with aluminium & gold - it should be under alloy.

If steel is placed in the same group as iron and nickel, then there is mistake in the question. Steel should be in a separate group under \"magnetic\"

Hi atutor2001,
Thanks for the information.
But can you please explain again why the answer state that 'Brass Fixture' has been placed in the wrong category if it is non-magnetic?
Thank you.