Qualification > Sciences
Biology Paper 1 and 3 help HERE ONLY!!!
sarcasm:
thanks mate... but is that it?
can u just tell me the other products...?
thanks alot..
nid404:
--- Quote from: sarcasm on June 07, 2009, 04:29:44 pm ---thanks mate... but is that it?
can u just tell me the other products...?
thanks alot..
--- End quote ---
there r a lot of complex products but u need to know nitrogen and carbon dioxide
sarcasm:
--- Quote from: nid404 on June 07, 2009, 04:32:00 pm ---
--- Quote from: sarcasm on June 07, 2009, 04:29:44 pm ---thanks mate... but is that it?
can u just tell me the other products...?
thanks alot..
--- End quote ---
there r a lot of complex products but u need to know nitrogen and carbon dioxide
--- End quote ---
thank you very much..!!
;D ;D
nid404:
ur welcome ;D ;D ;D ;D ;D ;D(haha)
Malak:
--- Quote from: hmh on June 07, 2009, 04:29:33 pm ---
--- Quote from: ang3l on June 07, 2009, 04:28:55 pm ---Can anyone help me with these questions..
Q:Describe how the structure of Xylem tissue is adapted to its functions And the Mechanism of water movement through Xylem.
Q:How blood provides suitable conditions for the reproduction of viruses.
--- End quote ---
The tracheids, fibres, and vessels present in the xylem, become lignified during development, losing their living contents. This makes the tissue impermeable (to water) so none is lost as water is transported via the xylem. The tracheids' bordered pits allow for the rapid movement of water from cell to cell.
As is with tracheids, the lignification of vessels can occur as rings, spirals, scalariform or reticulate. In the first formed xylem, rings and spirals occur more frequently. This allows for a limited amount of stretching which may occur in young structures.
Both tracheids and vessels provide a pathway for the transportation of water, whilst also contributing to support.
Hope tht helps!
--- End quote ---
Thx..
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