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Physics, Chemistry and Biology: Post your doubts here!

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look at the image the heart is there 2 so viens and arteries are part of the same oran system ( talking about the circulatory system all ) .... if u didn't got it ask again :)
well i didn't get it yet
so veins and arteries are tissues but together they are an organ ? or what
 
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i have a doubt in bio may 2011 Q 11
how come it is D i thoght it is B because the pollen tube is coming from the anther and
Q 19 i know anopheles is a ninsect because it has wings but which is the other insect
 
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why??? i do that everytime what is the problem with that? u have to learn from ur mistakes otherwise there will be no use in doing the papers :/
i mean in the exam .... cause the main aim from p1 is to confuse u so when u revise it again if any doubt happened all the information u have will disappear and u will find urself changing all ur answers
 
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well i didn't get it yet
so veins and arteries are tissues but together they are an organ ? or what
No they are not organs..they are tissues but in this diagram they are connecting different organs who are part of the same organ system.
 
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yea Q.22 is quite tricky the answer is A because if u know from the analysis table if u add silver nitrate to chloride ions u get a white precipitate silver chloride :D
Q.26 it is C actually D is wrong :D the ms is wrong
for J04 Q.19 it is A because aluminium and zinc give the same result with sodium hydroxide ( a soluble white ppt) so u cant seperate them but Ammonia for aluminium it forms an insoluble white ppt and zinc is a soluble ppt and so u can seperate them :D
for Nov 07 carbon is oxidised to carbon dioxide which escapes causing a decrease in mass, while copper when oxidised will form copper oxide which is a solid that settles causing an increase in mass :)
for Nov 09 i dont know which variant u didnt say i assumed it is variant 1, it is A because the Q says which can be correct and if u started with an element in group 0, then the other element will be in the same group and it will be unreactive and so the answer is A :)
- well AGCL is white,they consider it not coloured..Whenever asked for a coloured compound,choose the transition metal one.
-Highly reactive metals don't occur as oxides they occur as chlorides..
-It cleraly states differntiate,..If you used NaOH,then you'll get for both white precipitate and both ppt dissolve in excess.While using ammonia solution,NH4OH,one will dissolve in excess the other won;t
-Since carbon reacts with oxygen to form carbon dioxide which is a gas and so will pass out of the tube and mass decreases..Copper forms a solid oxide which is CuO.
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THANK U SOOOOOOOOOOOOOOOO MUCH 4 UR EFFORTS :) :D
 
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