Shades of blue show climate divisions that had monthly average temperatures below 50Â°F. The darker the shade of blue, the lower the average temperature. Climate divisions shown in shades of orange and red had average temperatures above 50Â°F. The darker the shade of orange or red, the higher the average temperature.
A stroma is the connective, part of a cell, organ or tissue. The  function of a stroma is to hold the cell, organ, or tissue together  and help it maintain form. Edit.
Originally Answered: What is the function of the cell wall? The cell wall serves to provide rigidity to a plant cell. Plant cells depend on turgor pressure for their structure within the plant as a whole and the plasma membrane surrounded by the cell wall would burst if it were not there to keep the plasma membrane from stretching.