Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 330630 times)

Offline K_M

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1440 on: May 22, 2010, 03:00:52 pm »
Heyyy, I need some help in Bio...

1) Regarding the kidneys, what's the difference between the first renal tubule and the second? What is the Loop of Henle? And what is the function of these parts? 

2) In transpiration, can someone please explain root pressure, capillary action and transpiration stream?

Thanks in advance

1. The first renal tubule is when the bloody gets filtered through the glomerulus into the Bowman's capsule or the renal capsule. The plasma leak the walls of the glomerulus but the proteins and RBCs are too big to pass out so they go into the renal capsule then they pass into the renal tubule which is the Loop of Henle where salt and water is reabsorbed according to the body's needs.

2. Root pressure: The roots is constantly absorbing water from the soil by osmosis so the cells in the root are highly turgid. This turgor pressure is what forces the water to move up the plant (from the root to the shoot etc)

Transpiration force: The leaves are constantly transpiring (during the daylight). As the leaves lose water through the stomata the water potential in the leaves is lower than the rest of the plant. SO osmosis basically happens because the water from the roots from upwards due to the water potential gradient since the roots have a higher water potential that inside the leaves.

Capillary action is basically when water gets distributed to the plant via the xylem.

I hope that made sense!

nid404

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1441 on: May 22, 2010, 03:01:28 pm »
If you want more resources on transport in plants...here's the thread

https://studentforums.biz/index.php/topic,763.0.html

Offline soraam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1442 on: May 22, 2010, 03:02:39 pm »
hey you all missed my mind up
What is REDOX to you

nid404

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1443 on: May 22, 2010, 03:03:18 pm »
A reaction in which oxidation and reduction happen simultaneously

Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1444 on: May 22, 2010, 03:04:59 pm »
this is not teh issue

teh isue is which one of them is redox???? the snwer is 1 and 2

whyyyyyyyyyyyyyyyyyyyyy?

Redox reactions, or oxidation-reduction reactions, have a number of similarities to acid-base reactions. Redox reactions are concerned with the transfer of electrons between species. Like acid-base reactions, redox reactions are a matched set -- you don't have an oxidation reaction without a reduction reaction happening at the same time. Oxidation refers to the loss of electrons, while reduction refers to the gain of electrons.

OIL RIG
oxidation is loss of electrons
reduction is the gain of electrons

Offline soraam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1445 on: May 22, 2010, 03:06:38 pm »
ok then
oxidation is
gain of oxygen
loss of electron
loss of hydrogen

in the first two choices the sulfer molecules are gaining Oxygen

and clearly there is no e) 1and 2 and 3
so its C) 1 and two
think rationally

Offline ambitious94

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1446 on: May 22, 2010, 03:08:31 pm »
nid 404 and K_M, thanks a gazillion guys! =D

nid404

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1447 on: May 22, 2010, 03:08:48 pm »
You got it wrong

Remember OILRIG

Oxidation
Is
Loss (of electrons)
Reduction
Is
Gain (of electron

put the question up

Offline soraam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1448 on: May 22, 2010, 03:11:15 pm »
heeeeeeeeeey
the question is easy

i think you should study bio
wich i have question in
what are the keywords in transpiration   (6 marks)

Offline Ivo

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1449 on: May 22, 2010, 03:12:29 pm »
You got it wrong

Remember OILRIG

Oxidation
Is
Loss (of electrons)
Reduction
Is
Gain (of electron

put the question up

Here is the question about redox reactions.  The answer is C, but I dunno why.  I know about OIL RIG, but still don't get it.  Surely 1 and 2 is only oxidation reaction, not redox.
Always willing to help!  8)
"In helping others, we shall help ourselves, for whatever good we give out completes the circle and comes back to us."

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1450 on: May 22, 2010, 03:13:14 pm »
A reaction in which oxidation and reduction happen simultaneously

I LOVE YOU VIN !!!!!!!!!! <3 + REP!

that bold part saved my mind !!!!!!!!


and yeh good point soraam

but just a question...The H20 GAINS OXYGEN FORM SO4 isnt that oxidation too  :-X
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline soraam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1451 on: May 22, 2010, 03:14:18 pm »
loooook the sulpher is oxidised the oxygen is reduced

if something is oxidised then the other is reduced so REDOX

Offline soraam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1452 on: May 22, 2010, 03:15:20 pm »
no that synthesis reaction

Offline soraam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1453 on: May 22, 2010, 03:17:26 pm »
it gained oxygen and hydrogen   oxidation and reduction to the same compound 
its like 1-1=0     so no oxidation then no REDOX

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1454 on: May 22, 2010, 03:18:51 pm »
loooook the sulpher is oxidised the oxygen is reduced

if something is oxidised then the other is reduced so REDOX

OOOOOOOOOOOOOOOOH OOOOOOOOOOK THANKS !

to the same compound !!
i see

cheers mate
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa