Q&A - P5 Science

[Jamesbond]

http://i41.tinypic.com/207w220.jpg\">

In answering the property for such question, is it better we say, solids have def vol and occupy space. Or jus say any one of the property.

[StudyRoom]

Jamesbond:

http://i41.tinypic.com/207w220.jpg\">

In answering the property for such question, is it better we say, solids have def vol and occupy space. Or jus say any one of the property.

To be safe, I'd say both
Solids have def vol and occupy space, AND
liquids have def vol and takes the shape of its container, so it's able to flow around the smaller plasticine and so the total volume remains at 200ml.

[Jamesbond]

PSLEguru:

Jamesbond:

http://i41.tinypic.com/207w220.jpg\">

In answering the property for such question, is it better we say, solids have def vol and occupy space. Or jus say any one of the property.

To be safe, I'd say both
Solids have def vol and occupy space, AND
liquids have def vol and takes the shape of its container, so it's able to flow around the smaller plasticine and so the total volume remains at 200ml.

Thanks a lot.

[marstolive]

PSLEguru:

Jamesbond:

http://i44.tinypic.com/2yngfax.jpg\">

For the question,
1) The plant is dying.
2) The stem below the cut ring swells a little.
Is my answer correct or not?

I think:
1) is correct
2) should be there is no swelling around the cut ring. (if anything, the swelling should be above, not below, the cut ring.)

The swelling in Plant X is due to food being produced in the leaves - this gets transported down the stem. Since the food carrying tubes are cut away, the stem swells above the cut area.

However, since in Plant Y, the cut area is above the water, the plant is not able to transport water up to the leaves, so the leaves are unable to produce food, and therefore there is no swelling.

Hi PSLEguru,
I do not understand why the plant will die, coz in the first place the water carrying tubes do not absorb the water.. so it does not matter whether the cut is above or in the water?
thx,
marstolive dd

[StudyRoom]

marstolive:

PSLEguru:

[quote=\"Jamesbond\"]http://i44.tinypic.com/2yngfax.jpg\">

For the question,
1) The plant is dying.
2) The stem below the cut ring swells a little.
Is my answer correct or not?

I think:
1) is correct
2) should be there is no swelling around the cut ring. (if anything, the swelling should be above, not below, the cut ring.)

The swelling in Plant X is due to food being produced in the leaves - this gets transported down the stem. Since the food carrying tubes are cut away, the stem swells above the cut area.

However, since in Plant Y, the cut area is above the water, the plant is not able to transport water up to the leaves, so the leaves are unable to produce food, and therefore there is no swelling.

Hi PSLEguru,
I do not understand why the plant will die, coz in the first place the water carrying tubes do not absorb the water.. so it does not matter whether the cut is above or in the water?
thx,
marstolive dd[/quote]If the cut is below the water, the plant can still absorb water through the cut. It's like a cut flower - the water can still go up the tubes.

If the cut is above the water, then the water cannot travel up the tube because the tubes are cut, and the water cannot be absorbed from the cut since the cut is above the water.

[Jamesbond]

http://i42.tinypic.com/1zvy0iq.jpg\">

Pl help.

[StudyRoom]

Jamesbond:

http://i42.tinypic.com/1zvy0iq.jpg\">

Pl help.

I think it's (2) B and C.

[Trevortan]

Pls help :

http://i44.tinypic.com/28sm2j6.jpg\">
Thanks in advance.

[marstolive]

Is this question asking movement of water or water vapour?

I thought water flows to A,xylem tubes while water vapour flow to C, the
stomata.
http://i40.tinypic.com/2lw6vie.jpg\">

can someone enlighten me?

thank u

[StudyRoom]

marstolive:

Is this question asking movement of water or water vapour?

I thought water flows to A,xylem tubes while water vapour flow to C, the
stomata.
http://i40.tinypic.com/2lw6vie.jpg\">

can someone enlighten me?

thank u

The question treats water and water vapour as the same thing.
Typically, most water into a leaf comes from the xylem.
Most water leaves the leaf through the stomata.
So the answer is (2), A, D.

The reason for this is that typically the space inside the leaf is saturated with water vapour (100% humidity). So it is unlikely that water vapour will be absorbed from the leaf through the stomata.