Question

1. the net primary production of a pine forest on a lava flow on mount fuji is about 175,000 kcal/m²/yr, and the plant respiration is estimated to be 115,000 kcal/m²/yr. what is the total amount of energy transferred during photosynthesis for this ecosystem? (a) 60,000 kcal/m²/yr (b) 115,000 kcal/m²/yr (c) 175,000 kcal/m²/yr (d) 290,000 kcal/m²/yr 10. the net annual primary productivity of a particular wetland ecosystem is found to be 8,000 kcal/m2 per year. if respiration by the aquatic producers is 12,000 kcal/m2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year? (a) 4,000 (b) 8,000 (c) 12,000 (d) 20,000 (e) 96,000 directions: select the choice that best fits each statement. the following question(s) refer to the following processes. (a) nitrification (b) denitrification (c) assimilation (d) ammonification (e) nitrogen fixation 11. nitrate ions and nitrite ions are converted into nitrous oxide gas and nitrogen gas (n₂). (a) nitrification (b) denitrification (c) assimilation (d) ammonification (e) nitrogen fixation 12. ammonia is converted to nitrite, then to nitrate. (a) nitrification (b) denitrification (c) assimilation (d) ammonification (e) nitrogen fixation

Explanation:

Step1: Recall the formula for net primary production

Net primary production (NPP) = Gross primary production (GPP) - Respiration (R). So, GPP = NPP + R.

Step2: Solve for question 9

Given NPP = 175000 kcal/m²/yr and R = 115000 kcal/m²/yr.
GPP = 175000+ 115000=290000 kcal/m²/yr.

Step3: Solve for question 10

Given NPP = 8000 kcal/m²/yr and R = 12000 kcal/m²/yr.
GPP = 8000 + 12000=20000 kcal/m²/yr.

Step4: Recall nitrogen - cycle processes for question 11

Denitrification is the process where nitrate ions (NO₃⁻) and nitrite ions (NO₂⁻) are converted into nitrous oxide gas (N₂O) and nitrogen gas (N₂).

Step5: Recall nitrogen - cycle processes for question 12

Nitrification is the process where ammonia (NH₃) is converted to nitrite (NO₂⁻) and then to nitrate (NO₃⁻).

Answer:

1. D. 290,000 kcal/m²/yr
2. D. 20,000
3. B. Denitrification
4. A. Nitrification