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rac1
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On page 101 in the AQA textbook from Nelson Thornes (the one on kerbodle) there is a micrograph of a group of red blood cells, I was just wondering if anyone knows why one of the cells has a group of dot things on it?
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Jaydude
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#2162
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(Original post by madmadmax321)
is the xylem living or dead tissue and why?

thanks
It is dead tissue, i.e it has no organelles or a cytoplasm

This allows;

Continuous collumn of water, so water can flow upwards.

Adhesion between xylem wall and water molecules

Cohesion of water molecules by H-bonds
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Amenbreak321
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(Original post by rac1)
On page 101 in the AQA textbook from Nelson Thornes (the one on kerbodle) there is a micrograph of a group of red blood cells, I was just wondering if anyone knows why one of the cells has a group of dot things on it?
It's a daisy.
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madmadmax321
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(Original post by Jaydude)
It is dead tissue, i.e it has no organelles or a cytoplasm

This allows;

Continuous collumn of water, so water can flow upwards.

Adhesion between xylem wall and water molecules

Cohesion of water molecules by H-bonds
thanks you!
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zbert
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#2165
air spaces throughout mesophyll

why is this good for rapid gas exchange in leaves? I forgot
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Manni
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#2166
This thread stresses me out at times lool
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Liam2404
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#2167
Could someone please write a 6 mark answer for water transport in plants from the root to the leaf? I thought i got it until the mark scheme started talking about the active transport of ions :s Would be much appreciated
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eddyf
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#2168
has anyone got the Biol2 January 13 test and mark scheme??
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sals1234
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#2169
(Original post by saaaarn)
Have you watched the khan academy video on it?
http://youtu.be/ijLc52LmFQg
Thank you so much!
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Jimmy20002012
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If the stomata is constantly closed why does the plant die?


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Nima123
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Can someone explain question 8ci to me Name:  image.jpg
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sals1234
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(Original post by eilish1903)
U don't actually need to know the process!!
U just need to know about independent segregation and crossing over. Then u need to know how many cells and what type. And then be aware of the fact that the original cell divides once to produce two cells and these two cells divide to produce two cells each, giving u four genetically non identical daughter cells.

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Ah okay! Thank youuu!
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Suzanna5678
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(Original post by Jimmy20002012)
If the stomata is constantly closed why does the plant die?


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CO2 can't enter for photosynthesis
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rac1
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(Original post by Amenbreak321)
It's a daisy.
haha. I think its probably antigens.
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Jimmy20002012
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(Original post by Nima123)
Can someone explain question 8ci to me Name:  image.jpg
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All it is, is 82% of 24?


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Swords N Thorns
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(Original post by Liam2404)
Could someone please write a 6 mark answer for water transport in plants from the root to the leaf? I thought i got it until the mark scheme started talking about the active transport of ions :s Would be much appreciated
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
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Jaydude
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(Original post by Jimmy20002012)
If the stomata is constantly closed why does the plant die?


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Stomata allows gas exchange

If they are closed, no gas exchange of co2 and o2 can occur

Plant cannot respire, photosynthesis cannot occur

Plant cells die
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Suzanna5678
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Can someone write a 6 mark response to surface area and size. Noooo idea what I'd write
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eddyf
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(Original post by Nima123)
Can someone explain question 8ci to me Name:  image.jpg
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could you send me the link to this?
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Amenbreak321
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(Original post by Nima123)
Can someone explain question 8ci to me Name:  image.jpg
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45% of 24 hours.
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