IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: Mastermind on June 04, 2009, 03:31:38 pm
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This is a question from Paper 1 2008, May/June:
23 The table shows the amount of water and salt lost from the kidneys and skin on a hot day and on
a cold day. Food and drink intake are the same on both days.
| water lost from | water lost from | salt lost from | salt lost from
\ kidneys/dm3 / skin/dm3 / kidney/g / skin/g
cold day| 1.8 | 0.0 | 20.2 | 0.0
hot day | 0.4 | 2.3 | 14.4 | 5.8
What do these results show?
A) Less water is lost from the kidneys on a cold day than on a hot day.
B)More salt is lost from the kidneys on a hot day than on a cold day.
C) The total amount of salt lost each day is the same.
D) Water is not lost from the kidneys on hot days.
& If you could tell me, why is more water lost in the kidneys on a cold day than on a hot day?
& why is more salt lost from the kidneys on a cold day than on a hot day?
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This is a question from Paper 1 2008, May/June:
23 The table shows the amount of water and salt lost from the kidneys and skin on a hot day and on
a cold day. Food and drink intake are the same on both days.
| water lost from | water lost from | salt lost from | salt lost from
\ kidneys/dm3 / skin/dm3 / kidney/g / skin/g
cold day| 1.8 | 0.0 | 20.2 | 0.0
hot day | 0.4 | 2.3 | 14.4 | 5.8
What do these results show?
A) Less water is lost from the kidneys on a cold day than on a hot day.
B)More salt is lost from the kidneys on a hot day than on a cold day.
C) The total amount of salt lost each day is the same.
D) Water is not lost from the kidneys on hot days.
& If you could tell me, why is more water lost in the kidneys on a cold day than on a hot day?
& why is more salt lost from the kidneys on a cold day than on a hot day?
the answer is A because on hot days u need water because most of the water is lost as sweat so the body retains the water for osmoregulation
salts part i dunno
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this isnt june.. ive just done june 08..
the answer is C..
as in a hot day the total amount of salt lost is 14.4+5.8= 20.2
and in a cold day its just 20.2 so theyre equal!
good luck m8
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A is wrong kimmy! :D
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This is a question from Paper 1 2008, May/June:
23 The table shows the amount of water and salt lost from the kidneys and skin on a hot day and on
a cold day. Food and drink intake are the same on both days.
| water lost from | water lost from | salt lost from | salt lost from
\ kidneys/dm3 / skin/dm3 / kidney/g / skin/g
cold day| 1.8 | 0.0 | 20.2 | 0.0
hot day | 0.4 | 2.3 | 14.4 | 5.8
What do these results show?
A) Less water is lost from the kidneys on a cold day than on a hot day.
B)More salt is lost from the kidneys on a hot day than on a cold day.
C) The total amount of salt lost each day is the same.
D) Water is not lost from the kidneys on hot days.
& If you could tell me, why is more water lost in the kidneys on a cold day than on a hot day?
& why is more salt lost from the kidneys on a cold day than on a hot day?
the answer is A because on hot days u need water because most of the water is lost as sweat so the body retains the water for osmoregulation
salts part i dunno
sorry dude i had done a similar question and confused it wid this!!!
my bad! :'(
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This is a question from Paper 1 2008, May/June:
23 The table shows the amount of water and salt lost from the kidneys and skin on a hot day and on
a cold day. Food and drink intake are the same on both days.
| water lost from | water lost from | salt lost from | salt lost from
\ kidneys/dm3 / skin/dm3 / kidney/g / skin/g
cold day| 1.8 | 0.0 | 20.2 | 0.0
hot day | 0.4 | 2.3 | 14.4 | 5.8
What do these results show?
A) Less water is lost from the kidneys on a cold day than on a hot day.
B)More salt is lost from the kidneys on a hot day than on a cold day.
C) The total amount of salt lost each day is the same.
D) Water is not lost from the kidneys on hot days.
& If you could tell me, why is more water lost in the kidneys on a cold day than on a hot day?
& why is more salt lost from the kidneys on a cold day than on a hot day?
the answer is C..add the two salt values to get the same as cold day..on a hot day, more water is lost by sweat..so to prevent dehydration of the body..less water is there in the urine...and for salts..its mainly..negligible or no sweat is produced in cold weather...so when there is sweat..we know that salts are an important part of sweat..so when sweat is produced..some salts are lost through the sweat..and the rest..through the kidney..
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Sorry meant Oct/Nov =P
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it isnt B its C.. read my explanation
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cud sum1 explain the nitrifying denitrifying nitrogen fixing bacteria?
wat does the nucleus in every body cell of a male contain?
X allele
y allele
y chromosome
y gene
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Ah thanks insanity-stricken & Wahab, +rep ;D
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cud sum1 explain the nitrifying denitrifying nitrogen fixing bacteria?
wat does the nucleus in every body cell of a male contain?
X allele
y allele
y chromosome
y gene
I replied to tht question in the other thread
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right got it now
and kim someone answered ur que at https://studentforums.biz/index.php?topic=2420.msg38514#new
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right got it now
and kim someone answered ur que at https://studentforums.biz/index.php?topic=2420.msg38514#new
dude u rock again +rep for u
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Kim..
the denitrfying bacteria just convert the nitrates back into nitrogen so its not good.
and the other one is y chromosome.. cuz alleles can be anything!
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Kim..
the denitrfying bacteria just convert the nitrates back into nitrogen so its not good.
and the other one is y chromosome.. cuz alleles can be anything!
\
thank u soooo much i hav bn searching for this ans for a loooooong time
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I was wondering this...
if someone consumes alcohol, where would the alcohol be first found?? and where is it in the highest concentration?
Could someone explain this to me?
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cud some1 plz send me the oct/nov 2008 physics p1 because its not downloading from freeexampapers. my email is mu_1031@hotmail.com. il realy appreciate.
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I was wondering this...
if someone consumes alcohol, where would the alcohol be first found?? and where is it in the highest concentration?
Could someone explain this to me?
usually in the gut
cuz then it goes in the liver and the liver reduces the concentration
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I was wondering this...
if someone consumes alcohol, where would the alcohol be first found?? and where is it in the highest concentration?
Could someone explain this to me?
It is first found in the LIVER.
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The alcohol is 1stfound in the hepatic portal vein coming from the small intestine and is broken down in the liver to remove its toxicity! :)
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The alcohol is 1stfound in the hepatic portal vein coming from the small intestine and is broken down in the liver to remove its toxicity! :)
Thanks i didnt know that
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The alcohol is 1stfound in the hepatic portal vein coming from the small intestine and is broken down in the liver to remove its toxicity! :)
Thanks i didnt know that
np
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i think ppl r just crazy because last time i logged in(yesterday) ma rep was 1 n now its -2 its irritating :(
i just hope ppl soon stop the rep game which they play ;)
its gud reps don't effect ur posts out here :)
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can somw1 plz send me jun-nov 1993 ques paper in bio
thx in advance :)
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can somw1 plz send me jun-nov 1993 ques paper in bio
thx in advance :)
OMG 1993 paper????
have u finished papers frm 1994-2008
if so then wow GR8 :o
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Does anyone know the difference between continous and discontinous variation?? pls!
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Does anyone know the difference between continous and discontinous variation?? pls!
discontiniuos variation is when u only have a imited amount of possibilities such as blood group or eye colour
continious is when u can have a lot of varieties such as height where a lot of ppl take the middle spot
also weight
gettit?
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Does anyone know the difference between continous and discontinous variation?? pls!
continuous variation are characteristics of an organism that are affected by both the genes and the environment but discontinuous variation is shown by organisms when a charcterisitic is affected only by the genes
e.g.continuous-mass,height
discontinuous-lobed ears, blood group, ability to roll tongue