HELP...Please help me with this may/june 2012 paper2 bio...!

[Kumkum]

please help me with question number 2 (d) and (e) and for(d) what is "F" and "G"?

 

[soccerprinc3]

For question 2(d) you just have to say that F is the cell membrane which is partially permeable and you should talk about the phospholipid bilayer with the hydrophilic heads pointing outwards making it water soluble. Then you should state the G is the cell wall which is fully permeable, you could mention that it is made up of cellulose which is a fibrous protien which have spaces inbetween the fibres for molecules to pass through

 

[Kumkum]

For question 2(d) you just have to say that F is the cell membrane which is partially permeable and you should talk about the phospholipid bilayer with the hydrophilic heads pointing outwards making it water soluble. Then you should state the G is the cell wall which is fully permeable, you could mention that it is made up of cellulose which is a fibrous protien which have spaces inbetween the fibres for molecules to pass through

ok thnx!!

 

[soccerprinc3]

For question (e) you simply have to discuss the symplast pathway and that molecules eg. Water, are transported from cell to cell through these gaps known as the plasmodesmatas. But since the question is 3marks im guessing you have to add an example of a molecule that travels like this, for instance sucrose which is actively loaded into the companion cell then moves by diffusion into the sieve elements through the plasmodesmata.

Hope this helped

 

[Kumkum]

For question (e) you simply have to discuss the symplast pathway and that molecules eg. Water, are transported from cell to cell through these gaps known as the plasmodesmatas. But since the question is 3marks im guessing you have to add an example of a molecule that travels like this, for instance sucrose which is actively loaded into the companion cell then moves by diffusion into the sieve elements through the plasmodesmata.

Hope this helped

thnx..!