Q&A - P3 Science

[tianzhu]

zeemimi:

i have questions regarding life cycles.


sorry if this question has been posted before. couldn't find time to plough through all the pages.

Is human / mammal 2 stage or 3 stage life cycle? Egg in the womb is it counted as 1 stage? Or give birth to young alive -> adult (i.e. 2 stage)?

Thank you.

Hi

Most mammals give birth to their young. However, there are exceptions, the spiny anteater and the platypus lay eggs.

In primary science, you can take it that those mammals that give birth as having two stages in their life cycles.

Fishes that give birth, eg guppies and swordtails also have two stages life cycle.

Best wishes

[zeemimi]

tianzhu:

zeemimi:

i have questions regarding life cycles.


sorry if this question has been posted before. couldn't find time to plough through all the pages.

Is human / mammal 2 stage or 3 stage life cycle? Egg in the womb is it counted as 1 stage? Or give birth to young alive -> adult (i.e. 2 stage)?

Thank you.

Hi

Most mammals give birth to their young. However, there are exceptions, the spiny anteater and the platypus lay eggs.

In primary science, you can take it that those mammals that give birth as having two stages in their life cycles.

Fishes that give birth, eg guppies and swordtails also have two stages life cycle.

Best wishes

tks. that was what i thought. but i was told that some students were taught that human is considered 3 stage life cycle. Because you must consider the egg in the womb as 1 stage.

Just want to clarify what should be the \"right\" answer.

[ttyh]

P3 science

A picture showing a teddy bear and a Polar bear
Question : Write down a difference between the teddy bear and the polar bar. (Do not compare their sizes, colors and shapes)

Ans 1 - Teddy bear is a non living thing but Polar bear is a living thing

Ans 2 - Teddy bear cannot die but the polar bear can die.

Pls let me know which answer deserves a full 2 marks?
Thanks

[S6169]

ttyh:

P3 science

A picture showing a teddy bear and a Polar bear
Question : Write down a difference between the teddy bear and the polar bar. (Do not compare their sizes, colors and shapes)

Ans 1 - Teddy bear is a non living thing but Polar bear is a living thing

Ans 2 - Teddy bear cannot die but the polar bear can die.

Pls let me know which answer deserves a full 2 marks?
Thanks

I think is ans 2. or other characters of living or non-living things. such as can grow, need water, food and air, etc.

[super-duper-quadruple]

Does anyone know that a grasshopper can fly or not?



Thanks!

[IJJ]

S6169:

ttyh:

P3 science

A picture showing a teddy bear and a Polar bear
Question : Write down a difference between the teddy bear and the polar bar. (Do not compare their sizes, colors and shapes)

Ans 1 - Teddy bear is a non living thing but Polar bear is a living thing

Ans 2 - Teddy bear cannot die but the polar bear can die.

Pls let me know which answer deserves a full 2 marks?
Thanks

I think is ans 2. or other characters of living or non-living things. such as can grow, need water, food and air, etc.

I think scientifically, ans 1 is right, but better would be either 1) ability to move from place to place 2) the need for air, food and water to grow 3)ability to reproduce 4)ability to respond to stimuli. I told my girl, for such question, go straight to the characteristics difference, cannot be wrong.

[IJJ]

super-duper-quadruple:

Does anyone know that a grasshopper can fly or not?



Thanks!

No.
[quote]Generally they are winged, but hind wings are membranous while front wings (tegmina) are coriaceous and not fit for flight. [/quote] from http://en.wikipedia.org/wiki/Grasshopper

[super-duper-quadruple]

Thanks for your reply.


By the way, which source do you usually use to find out such science questions? I also like to check http://en.wikipedia.org/wiki/. but my DD told me, \" my teacher says the info in this website is not always true!\" :roll:

[ttyh]

IJJ:

S6169:

[quote=\"ttyh\"]P3 science

A picture showing a teddy bear and a Polar bear
Question : Write down a difference between the teddy bear and the polar bar. (Do not compare their sizes, colors and shapes)

Ans 1 - Teddy bear is a non living thing but Polar bear is a living thing

Ans 2 - Teddy bear cannot die but the polar bear can die.

Pls let me know which answer deserves a full 2 marks?
Thanks

I think is ans 2. or other characters of living or non-living things. such as can grow, need water, food and air, etc.

I think scientifically, ans 1 is right, but better would be either 1) ability to move from place to place 2) the need for air, food and water to grow 3)ability to reproduce 4)ability to respond to stimuli. I told my girl, for such question, go straight to the characteristics difference, cannot be wrong.[/quote]Since scientifically 1 is right and this is science subject, so it should also get 2 marks, right?.....Sigh...I really don't understand current education anymore...

[S6169]

ttyh:

IJJ:

[quote=\"S6169\"]
I think is ans 2. or other characters of living or non-living things. such as can grow, need water, food and air, etc.

I think scientifically, ans 1 is right, but better would be either 1) ability to move from place to place 2) the need for air, food and water to grow 3)ability to reproduce 4)ability to respond to stimuli. I told my girl, for such question, go straight to the characteristics difference, cannot be wrong.

Since scientifically 1 is right and this is science subject, so it should also get 2 marks, right?.....Sigh...I really don't understand current education anymore...[/quote]no choice, must follow teacher's answer. sometimes feel difficult to explain to our kids.