Q&A - P5 Science

[StudyRoom]

jedamum:

PSLEguru:

[quote=\"Jamesbond\"]http://i44.tinypic.com/2rp5vt3.jpg\">

Pl help....

Hi I believe its (1) A only.
The shape of the magnet X and Y are properties of the magnet itself.
The starting point doesn't matter as long as it starts from before the clip is attracted.
And time shouldn't matter. In any case its not possible to do the experiment at the same time unless we're using different clips.

Could the answer be 2? A and B?


B is because using horse shoe magnet will not be fair as both poles of the horse shoe could have combine effect on the clip.

do I make sense?[/quote]Hi Jedamum,

Yes you make sense. I thought about that too. However, the shape of the magnet X and Y are properties of the magnet X and Y - you would not be able to make them the same shape if they are different. They cannot be controlled for if you're to compare X and Y only.

[marstolive]

carol73:

hi


1)is carrot an underground root or stem?
2)is potato an underground root or stem?
3)is sweet potato an underground root or stem?

is there way to reference I can use? I googled and am quite confused with the answers

1) carrot: underground root

2) potato: underground stem

3) sweet potato: underground root

thanks

[Oldschool]

carol73:

hi


1)is carrot an underground root or stem?
2)is potato an underground root or stem?
3)is sweet potato an underground root or stem?

is there way to reference I can use? I googled and am quite confused with the answers

Hi,

Hope this is helpful.

http://i42.tinypic.com/2rf3eyb.jpg\">

Introductory Botany: Plants, People, and the Environment, Media Edition ...
By Linda R. Berg

Regards

[marstolive]

Can someone help me with this?


why is the rate of evaporation decreases when a plant with leaves are covered with oil?


thanks in advance

[StudyRoom]

marstolive:

Can someone help me with this?


why is the rate of evaporation decreases when a plant with leaves are covered with oil?


thanks in advance

There are tiny pores on the leaves of a plant called stomata (singular called stoma) where gaseous exchange can occur. Most water loss occurs through the stomata. When the leaves are covered with oil, the stomata are blocked, and water cannot escape from the leaves.

[marstolive]

:thankyou:

PSLEguru:

marstolive:

Can someone help me with this?


why is the rate of evaporation decreases when a plant with leaves are covered with oil?


thanks in advance

There are tiny pores on the leaves of a plant called stomata (singular called stoma) where gaseous exchange can occur. Most water loss occurs through the stomata. When the leaves are covered with oil, the stomata are blocked, and water cannot escape from the leaves.

[marstolive]

:thankyou:

PSLEguru:

marstolive:

Can someone help me with this?


why is the rate of evaporation decreases when a plant with leaves are covered with oil?


thanks in advance

There are tiny pores on the leaves of a plant called stomata (singular called stoma) where gaseous exchange can occur. Most water loss occurs through the stomata. When the leaves are covered with oil, the stomata are blocked, and water cannot escape from the leaves.

[Jamesbond]

http://i44.tinypic.com/ra9kl5.jpg\">

Pl help me answer.

[StudyRoom]

Jamesbond:

http://i44.tinypic.com/ra9kl5.jpg\">

Pl help me answer.

Seems to be a little ambiguous. I suppose the question wants you to recognise that duckweed floats on water.
(1) littler won't obscure sunlight from the duckweed
(2) similarly, oil spill won't obscure sunlight. Although the water will still be polluted...
(3) chemicals will be an issue because the plants may get poisoned.
(4) soil erosion will cloudy the water, but since the plants float, it may be less affected.
So (3) seems to be the best answer.

Although (1), (2) and (4) may also cause the duckweed to die.

[Jamesbond]

PSLEguru:

Jamesbond:

http://i44.tinypic.com/ra9kl5.jpg\">

Pl help me answer.

Seems to be a little ambiguous. I suppose the question wants you to recognise that duckweed floats on water.
(1) littler won't obscure sunlight from the duckweed
(2) similarly, oil spill won't obscure sunlight. Although the water will still be polluted...
(3) chemicals will be an issue because the plants may get poisoned.
(4) soil erosion will cloudy the water, but since the plants float, it may be less affected.
So (3) seems to be the best answer.

Although (1), (2) and (4) may also cause the duckweed to die.

Answer given is 3. Was wondering how chemicals came in to pond? If it was a lake or river, then agreed. Can u pl tell me what is the source of chemicals here to clear my doubt? TIA.