Primary and Secondary Productivity Worksheet

Mean Dry Mass=33.1+4+5.2 =312.3 =4.1 g Four Weeks: Wet Mass: Mean Wet Mass=36.1+37.5+393=112.63 ≈ 37.53 g Mean Wet Mass=336.1+37.5+39 =3112.6 ≈ 37.53 g Dry Mass: Mean Dry Mass=7.2+8+9.33=24.53 ≈ 8.17 g Mean Dry Mass=37.2+8+9.3 =324.5 ≈ 8.17 g 2. Determine the percentage of dry mass (biomass) in an average two-week and four-week old pansy. Remember the wet mass is the total mass including water and biomass. Subtract the biomass percentage from 100% to get the percent mass in a pansy that is only water. Two Weeks: ● Percentage of Dry Mass: Percentage of Dry Mass=(Mean Dry MassMean Wet Mass)×100=(4.118.83)×100 ≈ 21.78% Percentage of Dry Mass=(Mean Wet MassMean Dry Mass )×100=(18.834.1 )×100 ≈ 21.78% ● Percentage of Water Mass: Percentage of Water Mass=100% − 21.78%=78.22% Percentage of Water Mass=100% − 21.78%=78.22% Four Weeks: ● Percentage of Dry Mass: Percentage of Dry Mass=(Mean Dry MassMean Wet Mass)×100=(8.1737.53)×100 ≈ 21.77% Percentage of Dry Mass=(Mean Wet MassMean Dry Mass )×100=(37.538.17 )×100 ≈ 21.77% ● Percentage of Water Mass: Percentage of Water Mass=100% − 21.77%=78.23% Percentage of Water Mass=100% − 21.77%=78.23% 3. On average, how much energy was stored as biomass in a two-week old pansy and in a four-week old pansy? (Hint: Each gram of plant biomass represents about 4.35 kcal of energy.) Two Weeks: