(a)[1]
Name structure A shown in the micrograph.
(b(i))[1]
Name one assimilate carried by these cells.
(b(ii))[2]
Give one example of a source and one example of a sink.
(c)[5]
Describe how the assimilate you named in (b)(i) is moved from the source to the sink.
(d)[1]
Aphids have mouthparts adapted for piercing the plant cells that carry assimilates. Suggest why aphids feed specifically from these cells.