Q&A - PSLE Science

[meimeitan]

Hi!


Sorry for the messy typing!

Group A
silk blouse
glass fish tank
coloured plastic bag


Group B
steel bar
car typres
paper plate


thanks.

[tianzhu]

meimeitan:

Ada grouped the objects in the following way:

Group A Group B
silk blouse steel bar
glass fish tank car tyres
coloured plastic bag paper plate

What property of the objects has Ada used to classify them into Groups A and B?

Hi meimeitan

The closest classification I can think of is degree of transparency to light.

Best wishes

[meimeitan]

Hi!


Thanks for your help. Another question is:

Which part of the aquatic plant allow it to float?

Thanks.

[tianzhu]

meimeitan:

Which part of the aquatic plant allow it to float?

Hi

This is a general question.
Is it the actual question or a summary from another question?

I guess the answer depends on the species or types of floating plants.

For water hyacinth, air spaces in leaf stalk help to keep the plant afloat.

Best wishes

[meimeitan]

Hi! TianZhu


Thanks for your smart guessing. Yes, it is water hyacinth. Thanks for your help.

:lol:

[tianzhu]

meimeitan:

Thanks for your smart guessing.

Hi

You're welcome.

Hope my guess for TOTO can be so accurate as well.

Best wishes

[meimeitan]

Hi! Ha ha …


Before going to try your luck, pls help one more question that my son asked. Thanks.

If I put a clear plastic sheet in between the screen and the torch, is there any shadow cast on the screen?

Thanks.

[tianzhu]

Hi meimeitan


In primary science, students learned that light travels in a straight line.

A shadow are made when an object blocks light.

Opaque objects make a dark shadow. Translucent objects will cast a light shadow. Transparent objects cast little or no shadows.

As clear plastic sheet is transparent,you can take no as the answer.

Best wishes

[meimeitan]

Hi


Thank you.

[meimeitan]

Hi TianZhu


Thank you.