Simard et al. (1997) further hypothesized that if reciprocal transfer did occur, it would be a source-sink relationship driven by photosynthetic rates. that is, if one seedling is in full sun and the other in deep shade, there will be a net movement of carbon from the seedling in full sun to the one in deep shade. if a shade was placed over the birch seedlings and the cedar, and the douglas fir was left in full sun, what result could simard and colleagues expect?
a) more 13c would be found in the birch than in the douglas fir.
b) more 13c would be found in the douglas fir than in the birch.
c) the most 13c would be found in the cedar.
d) the most 14c would be found in the cedar.