Q&A - P4 Science

[j.032906a.032906m.032906]

atutor2001:

The toughest aspect of science is the need to be careful with the definition of the words used (i.e. science term). Most of the time, we would consider waste as undigested food. However, for science, waste is not undigested food. Waste refers to the remains of the food that has no more use. Undigested food refers to food that still contain useful substances but are not digested yet. Although we can find undigested food in our waste (especially if we lau sai ) the rectum is meant for storage of waste and not undigested food.

Oops! Just saw this.

Agree.

That's why I always remind my dd to look for key words and their associated partners, be specific in description and use the correct terms in each topic. As far as I can see in primary school science, there's no such things as \"I think\", \"the picture looks like that wat!\", etc. If it's not written down or deduced or calculated from the facts given, cannot make your own assumptions to be so. She's not conducting experiments or testing a hypothesis - yet!

[Michaelia0816]

Some of the keywords is about processes while others is describe, just dun understand how do us get those from, textbk? Sometime, do not understand, but luckily I understand, just sharing, JJ.

[jedamum]

Help.

Most food r digested where? Stomach or small intestine?
Answer say stomach.

[smartmummy]

jedamum:

Help.

Most food r digested where? Stomach or small intestine?
Answer say stomach.

small intestine
Small intestine Main article: Small intestine
It has three parts: the Duodenum, Jejunum, and Ileum.

After being processed in the stomach, food is passed to the small intestine via the pyloric sphincter. The majority of digestion and absorption occurs here after the milky chyme enters the duodenum. Here it is further mixed with three different liquids:
http://en.wikipedia.org/wiki/Digestion

[jedamum]

Thanks smartmummy!

[rrjan]

http://i45.tinypic.com/wlaq9j.jpg\">


Hi, could any science guru kindly explain this question to me? Answe from school is 4, but my son's answer is 3. Thought that since water has a definite volume and took up 50 cubic cm of fixed space, since container A has a volume of 120 cubic cm, then the amount of air that can occupy the container will be 70cubic cm? :idea:

[Nebbermind]

P4 syllabus teaches that gas can be compressed. So u can put 100cm3 of oxygen into a smaller volume of space.

[fightingmom]

Yah… what Nebbermind explains is right

[chloecube]

my answer is nos 4 too.


DS’s mock science paper came out with similar question like this too

explaination : air can be compressed

[rrjan]

http://i50.tinypic.com/14lpsad.jpg\">


Thanks for all the kind explainations. Could someone kindly help me with this question then.

Very similar question, but it was a past year's top school exam paper. My son is still quite confused with how to answer such question, cos he says that if there is no fluid, in the container, then the container would be able to accomodate any volume of air (air can be compressed), but if it is filled with a definite volume of fluid say 200 cubic cm(as for this past year question) , would the container still accomodate any volume of air or just the remaining volume of the container?? :scratchhead: :?: