Q&A - PSLE Science

[tianzhu]

Hi Belle2011


Stomata are openings in leaves which allow for gaseous exchange. For water plants like water lilies, stomata are found on the upper sides of leaves, where they are exposed to the surrounding air.

Please check with your school teacher if the topic on stomata in aquatic plants is covered in PSLE science syllabus.

Best wishes

[Belle2011]

Dear all,


How do money plants adapt themselves to grow upwards to get sunlight to carry out photosynthesis?
(a) They have woody stems
(b) They twine round supports
They have tendrils to help them climb
(d) They have roots to help them climb.

Thank-you.

Cheers,
Belle

[tianzhu]

Belle2011:

How do money plants adapt themselves to grow upwards to get sunlight to carry out photosynthesis?
(a) They have woody stems
(b) They twine round supports
(c) They have tendrils to help them climb
(d) They have roots to help them climb.

Hi

I am more inclined to go for option (d) ----- They have roots to help them climb.

Best wishes

[Belle2011]

tianzhu:

Belle2011:

How do money plants adapt themselves to grow upwards to get sunlight to carry out photosynthesis?
(a) They have woody stems
(b) They twine round supports
(c) They have tendrils to help them climb
(d) They have roots to help them climb.

Hi

I am more inclined to go for option (d) ----- They have roots to help them climb.

Best wishes

Dear tianzhu,
Yes, the model answer is (d).

What is the meaning of \"having roots to help them climb\"? I thought money plant seems to be able to stand alone and unlike those with weak stems which need to twine around supports or have tendrils to help them climb?

Thank you very much for your advice.

Cheers,
Belle

[tianzhu]

Hi Belle


I think you’re referring to those decorative money plants in pots found on tables in many houses.

When I was a young boy many years ago, I saw money plants climbing on fences in the kampong I lived in.

Please refer to page 8 and 9 of this link.
http://www.nios.ac.in/srsec314newE/PDFBIO.EL6.pdf

Best wishes

[Belle2011]

tianzhu:

Hi Belle


I think you’re referring to those decorative money plants in pots found on tables in many houses.

When I was a young boy many years ago, I saw money plants climbing on fences in the kampong I lived in.

Please refer to page 8 and 9 of this link.
http://www.nios.ac.in/srsec314newE/PDFBIO.EL6.pdf

Best wishes

Dear tianzhu,
Thanks for sharing the website. Guess the materials involved are way beyond PSLE level but good to read for info.
Thank-you.

Cheers,
Belle.

[tianzhu]

Belle2011:

Dear tianzhu,

Thanks for sharing the website. Guess the materials involved are way beyond PSLE level but good to read for info.
Thank-you.

Hi Belle

Good Morning

If I remember correctly, there are some information on money plants in primary science textbook and guidebooks.

Have you tried reading your science guidebooks from MC and EPH?

I think adaptation of climbing plant ( weak stems) is covered in PSLE science syllabus.

Best wishes

[anneshirleygilbert]

Hello everyone,

Need some help on this question.

The diagram below shows three thin square sheets P, Q and R arranged in a straight line.

(sorry, but I cannot get the diagram to be copied here.)

When the light source is turned on, a bright heart-shaped patch of light is seen on sheet Q only.

Which one of the following describes correctly the properties of the materials which P, Q and R are made of?

allows light to does not allow not possible
pass through light to pass to tell
1.\tP\t Q\t R
2.\tP\t R\t Q
3.\tQ\t P\t R
4.\tR\t Q\t P


A.\t1
B.\t2
C.\t3
D.\t4



I find none of the options could be the possible answer.
Material P and Material Q have to be opaque in order for the image on Q to be bright. Any input to enlighten me will be appreciated.
Thank you.[/img][/code]

[autolycus]

The answer must be A if the light is travelling in the direction PQR. (It must be D if the light is travelling in the direction RQP.)


For the first case:

Light passes through P, or it can’t even get to Q.

Light lands on Q.

The light is partly reflected and partly absorbed by Q, so a bright image is seen. Q is opaque.

However, if Q is opaque, you can’t tell anything about R because light never reaches R.

=====

If the light is travelling in the direction RQP then the reasoning is the other way round. I can’t tell where the light is coming from, from your question.

[anneshirleygilbert]

Thank you for your reply. Light is travelling from the left, i.e. toward PQR. However doesn’t P have to be opaque? If P isn’t opaque, there would be no image of the heart at all because light can pass through transparent/translucent material.