why do leaves at the tops of trees lose chlorophll first in Autumn

Question: why do leaves at the tops of trees lose chlorophll first in Autumn
- Keywords:
  autumn,
  chlorophll,
  leaves
Asked by queen to Rachel on 10 Nov 2015.
- Rachel McMullan answered on 10 Nov 2015:
  
  Hmmm, I don’t think I know the answer to this one. If I had to guess I’d say it has something to do with the nutrients from the stem having further to travel to reach the ends of the branches but I don’t really know
  What do you think?

Question: why do leaves at the tops of trees lose chlorophll first in Autumn