Biolgy paper 1 help!

[amachq]

can anyone tell wht was the answer of question no.40
that sewage thing...........

[IO4567]

i put C but im not sure loads of my friends put D
im convinced its C! you?

[Pythagoras]

I put D. I think it was the correct one...

[Pythagoras]

About that question of the phloem tubes... what was the answer? i put fats... is it correct?

[homer]

is D farm A?......i don't get the question..if the nitrate levels were the highest after that farm then doesnt it have the most fertiliser?

[....]

for the sewage one, the last question, im quite sure it was D...the phloem was obviously fat..cuz phloem transport amino acids and sucrose in solution (water)

[nid404]

yup that was D and the aphids lack fats

[shagurl]

for the sewage one, the last question, im quite sure it was D...the phloem was obviously fat..cuz phloem transport amino acids and sucrose in solution (water)

then how come nuts which are made from plants have fat in them where did it come from? plus fats are not dissolved in water just like sucrose

[nid404]

Green plants can make all the materials(including fats and sucrose)using water,carbon dioxide and salts. They r synthesized from sugar molecules and other molecules produced in photosynthesis.

Glucose and amino acids are transported in solution(water). Fats are synthesized for cell membrane and for storing in seeds.

[Friends]

The answer of the 40th WAS C

[nid404]

it was D dude.

cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen

[john12345]

Heyy


nd what was the answer for which of dese carry glucose

was it arteries only
or arteries and veins

was dat a difficult question or am i just too stupid to have got the wrong answer for that

[Friends]

it was D dude.

cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen

Sorry man I dont agree with U.
See when oxygen level decreases,the fishes starts to die.
 so the number of bacteria increase as they feed on dead fishes.
 as from first the oxygen is less they respire anaerobically. 

And how can dying of fish decrease oxygen level...

[Friends]

Ok i got the Answer.
If anyone uses Study guide of IGCSE for biology by Dave Haywaed
Plz see page no 128.

Highest is oxygen
then        Algea
then        nitrates
then        suspended solids
then        sewage fungus

[IG_ICE09]

the sewage one HAS TO be "number of bacteria increase" as the first stage, so i think it started with 4-x-x-x as the order of events...i4got if it was C or D but when sewage is let in2 a river first the no of bacteria increase thats obvious, THEN they start depleting oxygen levels, fish die, and as a result, more anaerobic organisms (hu can survive without O2) are remaining.