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Jimmy20002012
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#2181
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#2181
(Original post by Suzanna5678)
CO2 can't enter for photosynthesis
So respiration won't happen either?


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Liam2404
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#2182
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#2182
(Original post by swords n thorns)
i'll have a shot, but i can't say it will be perfect:
- ions actively transported into xylem by endodermis
- this lowers the water potential of the xylem, causing water to move in by osmosis
- continuous column of water up the xylem
- hydrogen bonds between the water molecules give them cohesive properties
- this creates tension in the xylem
- adhesion of water molecules and xylem wall also aids transpiration
thank you so much!
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eddyf
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#2183
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#2183
(Original post by Nima123)
Can someone explain question 8ci to me Attachment 222275
82% of 24= 19.68
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Suzanna5678
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#2184
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#2184
(Original post by Jimmy20002012)
So respiration won't happen either?


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You're right, it won't cause you need oxygen for respiration
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science-oliver
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#2185
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#2185
What is the mass transport system? Like what is mass transport in blood? Thank you
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HannahC1996
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#2186
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#2186
(Original post by science-oliver)
What is the mass transport system? Like what is mass transport in blood? Thank you
In mammals, the mass transport system includes the transport of blood throughout the body, ie. via arteries, arterioles, capillaries, veins etc.
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seraphina95
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#2187
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#2187
There were no visible chromosomes. as thats what happens in interphase

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Pataiiii
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#2188
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#2188
(Original post by Hi, How are you ?)
Can anyone help me at question 5di, and 5dii.

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http://filestore.aqa.org.uk/subjects...W-QP-JUN10.PDF
For the second part all you need to remember is that the number of chromosome combinations possible is equal to 2^n where n is the number of homologous chromosomes so the and is 2 cubed ie 8
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franheaume
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#2189
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#2189
Does anyone have any predictions for the exam tomorrow?
and good luck to everyone
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zbert
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#2190
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#2190
I was wondering if anyone had a simplistic bullet point explanation of tissue fluids?
I still don't understand it
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The_Blade
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#2191
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#2191
Guys, the apoplast pathway, casperian strip has not come up in past papers. You think it will come up tomorrow?

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Suzanna5678
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#2192
What would an answer be for a 6 mark question on xerophytes??
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Swords N Thorns
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#2193
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#2193
(Original post by zbert)
I was wondering if anyone had a simplistic bullet point explanation of tissue fluids?
I still don't understand it
- High hydrostatic pressure in capillaries forces water out
- Large proteins remain in capillaries, reducing water potential of capillaries
- Loss of tissue fluid from capillaries reduces hydrostatic pressure
- Water returns to capillaries down a water potential gradient
- By osmosis
- The remainder of the tissue fluid is returned to the circulatory system by the lymphatic system.
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Teffie123
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#2194
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#2194
(Original post by Jimmy20002012)
If the stomata is constantly closed why does the plant die?


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Because without the stomata being close gases need for respiration (C02 and 02) cannot enter plant through stomata air spaces
So plant cannot photosynthesis (make its own food souce/engery)
as photosynthesis requires C02 So plant dies
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Jean20
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#2195
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#2195
(Original post by maryamnc)
for people who wanted these, possible 6 markers with answers (not mine obviously haha)
These are brilliant thanks, but what did you use to make them,
i haven't seen some of these questions on past papers?
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Swords N Thorns
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#2196
(Original post by Suzanna5678)
What would an answer be for a 6 mark question on xerophytes??
- Thick waxy cuticle
- Increases diffusion pathway
- Rolling up of leaves
- Traps humid layer of air
- Reduces water potential grad, so less transpiration
- Hairy leaves
- Traps moist layer of air next to leaf surface, lowers water potential grad
- Stomata in pits and grooves
- Trap moist air next to leaf surface, reduces water potential grad
- Reduced SA/vol ratio
- Slower rate of diffusion
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Tee Logan x
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#2197
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#2197
Can someone explain to me the answer for q10b jan 2012? Thank you
And also can anyone briefly explain to me differences between cohesion tension and root pressure? All help is appreciated
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HannahC1996
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#2198
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#2198
(Original post by zbert)
I was wondering if anyone had a simplistic bullet point explanation of tissue fluids?
I still don't understand it
At the artery end of the capillary, the hydrostatic pressure is high and larger than the effects of osmosis which results in a net movement of blood plasma into the tissues.
(Tissue fluid is blood plasma without any large proteins or red blood cells, and is found in the tissues)
The cells use nutrients from the tissue fluid in respiration.
The vein end of the capillary has a low pressure and a low water potential due to the large proteins that remain in the capillary.
Tissue fluid/water containing oxygen and carbon dioxide re-enter the capillary via osmosis.
Lymphatic vessels drain excess tissue fluid.
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Suzanna5678
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#2199
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#2199
(Original post by swords n thorns)
- thick waxy cuticle
- increases diffusion pathway
- rolling up of leaves
- traps humid layer of air
- reduces water potential grad, so less transpiration
- hairy leaves
- traps moist layer of air next to leaf surface, lowers water potential grad
- stomata in pits and grooves
- trap moist air next to leaf surface, reduces water potential grad
- reduced sa/vol ratio
- slower rate of diffusion
thanks angel
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Pataiiii
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#2200
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#2200
(Original post by zbert)
I was wondering if anyone had a simplistic bullet point explanation of tissue fluids?
I still don't understand it
At the arteriole end of the capillary, the toward hydrostatic pressure is greater than the I ward osmotic pull caused by the effect of the plasma proteins.
Water, ions and small molecules are filtered out of the blood into the spaces between cell - this is tissue fluid.
the loss of fluid from the blood leads to a fallin hydrostatic pressure as he look approaches the venue end of the capillary.
at the venue end of the capillary, the inward osmotic pull now exceeds the outward hydrostatic pressure and some of the water re enters by osmosis down a water potential gradient.
tissue fluid is drained away from the. Cells by the lymph vessels and returned to the circulation near the heart.
thats everything you need to know.
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