Q&A - PSLE Science

[tianzhu]

starlight1968sg:

Thanks a lot for your explanation. :celebrate:

Hi

You're welcome.

You may wish to refer to PSLE Science Guide(MC) for more information.

Best wishes

[meimeitan]

Hi starlight1968sg and Tian Zhu


Thanks a lot for your explanation. Hope both of you always be with this thread. Really! Helps us a lot. Thanks again.

meimeitan

[starlight1968sg]

meimeitan:

Hi starlight1968sg and Tian Zhu

Thanks a lot for your explanation. Hope both of you always be with this thread. Really! Helps us a lot. Thanks again.
meimeitan

meimeitan,
I am still learning from others. Credit goes to Tian Zhu.

[meimeitan]

Hi!


Some challenging questions: he he he …

(1) A jar with grasshoppers in it in field from 8 am to 5 pm. Which of these factors of the environment would affect their survival?
a availability of food
b presence of predators
c inappropriate temperature

which is / are correct? Thanks.

(2) Which of the following occurs at evening (about 6 pm) in a plant?
a respiration begins to take place.
b photosynthesis stops completely.
c the rate of photosynthesis is lower than the rate of respiration.
d the rate of photosynthesis is the same as the rate of respiration.

thanks thanks thanks.

meimeitan

[starlight1968sg]

meimeitan:

(1) A jar with grasshoppers in it in field from 8 am to 5 pm. Which of these factors of the environment would affect their survival?

a availability of food
b presence of predators
c inappropriate temperature

(2) Which of the following occurs at evening (about 6 pm) in a plant?
a respiration begins to take place.
b photosynthesis stops completely.
c the rate of photosynthesis is lower than the rate of respiration.
d the rate of photosynthesis is the same as the rate of respiration.

For (2), c.
For (1), MAYBE a and c. :roll:

What are the answers?

[meimeitan]

Hi! starlight1968sg


Thanks a lot! Thanks a lot! Thanks a lot! Thanks a lot!

Have a nice day!!

meimeitan

[meimeitan]

Another challenging question:


A group of boys were competing to see whose car can travel the greatest .
The car is flung forward using a elastic band like a captapult on the ground.

If you were one of them, what can you do to increase the chances of winning?

1. extend the elastic band as far as possible
2. use a thicker rubber band
3. use a lighter toy car
4. put some powder on the surface the car is travelling on

thanks!! :? :? :?: :?: :?: :?:


meimeitan

[Nebbermind]

I wld choose (1) & (3)


(2) cannot tell…what if it is so thick that u cannot even exted it?
(4) if car is gliding on the surface, then prob go further (like carrm puck). If rolling, then it’ll slip and will not go further.

[meimeitan]

Hi! Nebbermind


Thanks a lot! However, the answer on the exercise book is a, b, c. Could it be that the powder makes the surface the car is moving on more slippery? I think the answer in the exercise book is wrong! I really don't know! Need to check with others!! Once again, thanks!!

meimeitan

[meimeitan]

Hi! Nebbermind,


I think option 2 is correct! I think the elastic band can be stretched, if not it will not be called an elastic band!
For option 4, ...I don't know!! :?: :?: :?: :? :? :?

meimeitan