Q&A - PSLE Science

[Muffins]

Hi cluelessmom, strawberry jam is a liquid.


A liquid is a fluid that has the particles loose and can freely form a distinct surface at the boundaries of its bulk material. The surface is a free surface where the liquid is not constrained by a container. And jam can flow freely throughout the bottle without any jams (in this sense, it means blockage) whatsoever, so it is more inclined to being classified as a liquid. That's what I think.....

[cluelessmom]

Thank U Muffins

[Muffins]

No problem!

[rubydoll]

Please answer

Is Mass of a iron rod and a bag of feathers of same weight are same… from
rulang sa1 2009 -q20.

Q}do penguin has wings?from raffles-2009 sa1-book a q1

can anyone pls explain Q-5 from raffles SA1 =2009.
what does a seed need to germinate?does it need oxygen???
thank you

[tianzhu]

Hi


Please follow this link to the testpaper from Raffles.
http://www.misskoh.info/09/primary6-rgssa1-science.pdf

For Q1 ---- Option (2) is correct.
Penguins are birds. They have wings which are used as paddles to help them swim faster, but this information is of no relevance in answering this question.

For Q5 ----- In primary science, students learnt about the three conditions for germination, water, air (oxygen) and warmth ( right temperature).Therefore option (1) is right.

As for Rulang’s question, I can’t find a working link to it. The link in this site malfunctions.
http://www.orlesson.org/orp/ScienceExam.html

Best wishes

[rubydoll]

Thank you.

[ruyu]

State the interdependance of the fish and the hydrilla in this pond community.

[tianzhu]

ruyu:

State the interdependance of the fish and the hydrilla in this pond community.

Hi

Hydrilla(submerged aquatic plant) provides oxygen for fishes when it photosynthesises. Fishes breathe out carbon dioxide that the plants need for photosynthesis. Some fishes find shelter and shade or feed on the plants.The waste from the fishes fertilises the soil to help hydrilla grow.

Best wishes

[ruyu]

tianzhu:

ruyu:

State the interdependance of the fish and the hydrilla in this pond community.

Hi

Hydrilla(submerged aquatic plant) provides oxygen for fishes when it photosynthesises. Fishes breathe out carbon dioxide that the plants need for photosynthesis. Some fishes find shelter and shade or feed on the plants.The waste from the fishes fertilises the soil to help hydrilla grow.

Best wishes

ok thanks one more question, does the floating plants and fish interdepend on one another?

[tianzhu]

ruyu:

ok thanks one more question, does the floating plants and fish interdepend on one another?

Hi ruyu

Good Morning
It’ll be interesting to hear what you think is the answer. Please share your view.

Best wishes