In cold temperatures, phospholipid bilayers with saturated fatty acid tails are more rigid, while phospholipid bilayers with unsaturated fatty acid tails maintain the fluidity and flexibility that cells require.
During different times of the year, some plants (like Winter Wheat) can change the concentration of unsaturated phospholipids.
The diagram shows the composition of Winter Wheat phospholipids in the summer. Draw what you would expect to see in the winter.
a) Increase in unsaturated phospholipids
b) Decrease in unsaturated phospholipids
c) No change in phospholipids
d) Increase in saturated phospholipids