Q&A - P3 Science

[tianzhu]

teh_oh:

According to our science guidebook's concept map, pineapples and bananas have no seeds. But according to the internet and our (my child and I) personal (other) reading/knowledge, both fruits have seeds. Any other guide books has information that confirm that the above fruits are generally categorised as seedless?

Hi teh_oh

Good Morning.

Which guidebook are you referring to?

How about your textbooks? Do they mention anything about classification by the number of seeds?

I vaguely remember that the old science textbooks mentioned about classification by the number of seeds into two categories --- one seed and more than one seed. There is no mention about classification under no seeds.

We don’t see seeds in the bananas and pineapples we eat; maybe, they are cultivated to be seedless. We can also see seedless grapes and watermelons in the supermarkets.

A good site to read more about bananas
http://bananasweb.com/bananas/Do+bananas+have+seeds%3F

Another question which guidebooks and websites may give different answers ------ Is paper a natural or manmade material?

I suggest you write to your child’s science teacher to find out how they are classified in the science syllabus.

Best wishes

[teh_oh]

tianzhu:

teh_oh:

According to our science guidebook's concept map, pineapples and bananas have no seeds. But according to the internet and our (my child and I) personal (other) reading/knowledge, both fruits have seeds. Any other guide books has information that confirm that the above fruits are generally categorised as seedless?

Hi teh_oh

Good Morning.

Which guidebook are you referring to?

How about your textbooks? Do they mention anything about classification by the number of seeds?

I vaguely remember that the old science textbooks mentioned about classification by the number of seeds into two categories --- one seed and more than one seed. There is no mention about classification under no seeds.

We don’t see seeds in the bananas and pineapples we eat; maybe, they are cultivated to be seedless. We can also see seedless grapes and watermelons in the supermarkets.

A good site to read more about bananas
http://bananasweb.com/bananas/Do+bananas+have+seeds%3F

Another question which guidebooks and websites may give different answers ------ Is paper a natural or manmade material?

I suggest you write to your child’s science teacher to find out how they are classified in the science syllabus.

Best wishes

Hi Tianzhu,
Thanks for the information.
The guidebook that my child showed me is the EPH Ultimate Science Guide. Their Overview Concept Map classify fruits into No Seed, One Seed, Few Seeds and Many Seeds.
I have yet to check his textbook (My Pals). Will do so. Thanks.

[meimeitan]

hi Everyone


There is a question. Hope to get help. Thanks.

When the arrow is released, it travels towards the target at a great speed. This shows that it has a great deal of energy when it leaves the bow. The sources of energy come from the ________________.

A: arrow
B: wooden bow
archer’s arm
bowstring

(1) C only
(2) D only
(3) B and D only
(4) A and B

[tianzhu]

meimeitan:

When the arrow is released, it travels towards the target at a great speed. This shows that it has a great deal of energy when it leaves the bow. The sources of energy come from the ________________.

A: arrow
B: wooden bow
archer's arm
bowstring

(1) C only
(2) D only
(3) B and D only
(4) A and B

Hi meimeitan

Is energy conversion in lower primary science syllabus?

When the arrow is released, the sources of energy are from the wooden bow and bowstring.

Best wishes

[meimeitan]

Hi TianZhu


It is for primary level energy. I puzzle why the archer’s arm is not included. Any explanation? Thanks.

[tianzhu]

meimeitan:

Hi TianZhu


It is for primary level energy. I puzzle why the archer's arm is not included. Any explanation? Thanks.

Hi

First, is my answer correct?

The key point to note here is when the arrow is released.

The question did not ask for the energy conversion starting from the moment when the bow is draw back.

The archer stores potential energy by bending the bow. This energy is converted to the arrow as kinetic energy when the arrow is released.

Best wishes

[meimeitan]

Hi Tianzhu


Your answer is correct. Thanks for yr clear explanation. I fully understand. Thanks.

[tianzhu]

meimeitan:

Hi Tianzhu


Your answer is correct. Thanks for yr clear explanation. I fully understand. Thanks.

Hi

You're welcome.

Best wishes

[teh_oh]

Hi,

Would like to reaffirm if the answer in the Answer Key is wrong.


http://postimage.org/image/no8gmfj8/

Answer Key is 4.

Thanks.

[tianzhu]

Hi moderator


To avoid confusion, please help to delete this post so that readers can go directly to the right answer.

Best wishes