7. Which of the following would be the best reason for a spike in plant growth? a. Regular watering b. Extra water C. Buried a dead fish in the terrestrial chamber d. Temperature increased 8. What is the best reason as to why dissolved oxygen levels dropped with a dead fish: a. The elodea had less CO_(2) to use to turn into Oxygen b. The plants had less nutrients to create oxygen C. Bacterial decomposition of the fish used up dissolved CO_(2) C. Bacterial decomposition of the fish used up the dissolved oxygen 9. What is the lowest acceptable level of dissolved oxygen for MOST aquatic life? a. 3mg/l b. 5mg/l C. 1mg/l d. 7mg/1 10. What is the purpose of watering our terrestrial chamber with aquatic chamber water? a. To save water in a drought b. To provide terrestrial plants with nitrate and phosphates produced in fish waste C. To provide terrestrial plants and animals calcium and nitrates produced from fish respiration d. To provide terrestrial detritivores needed nitrates 11. Which of these are ways that dissolved oxygen is added to the aquatic chamber? a. Dissolved from the air and provided through cellular respiration of the fish b. Photosynthesis of elodea and photosynthesis of nitrogen -fixing bacteria C. Dissolved from the air and photosynthesis of elodea d. Cellular respiration of the fish and also of the elodea 12. The leaves of many of the plants in our ecocolumns turned yellow towards the end of the lab. Which of the following is NOT a possible reason for this a. Nitrogen was used at a faster rate than it was replenished through nitrogen fixation b. Nitrogen was used at a faster rate than it was replenished by decomposition C. Nitrogen was used at a faster rate than it was replenished by the cilantro d. Too much competition from plants for nutrients and this caused nutrient depletion

Question

7. Which of the following would be the best reason for a spike in plant growth? a. Regular watering b. Extra water C. Buried a dead fish in the terrestrial chamber d. Temperature increased 8. What is the best reason as to why dissolved oxygen levels dropped with a dead fish: a. The elodea had less CO_(2) to use to turn into Oxygen b. The plants had less nutrients to create oxygen C. Bacterial decomposition of the fish used up dissolved CO_(2) C. Bacterial decomposition of the fish used up the dissolved oxygen 9. What is the lowest acceptable level of dissolved oxygen for MOST aquatic life? a. 3mg/l b. 5mg/l C. 1mg/l d. 7mg/1 10. What is the purpose of watering our terrestrial chamber with aquatic chamber water? a. To save water in a drought b. To provide terrestrial plants with nitrate and phosphates produced in fish waste C. To provide terrestrial plants and animals calcium and nitrates produced from fish respiration d. To provide terrestrial detritivores needed nitrates 11. Which of these are ways that dissolved oxygen is added to the aquatic chamber? a. Dissolved from the air and provided through cellular respiration of the fish b. Photosynthesis of elodea and photosynthesis of nitrogen -fixing bacteria C. Dissolved from the air and photosynthesis of elodea d. Cellular respiration of the fish and also of the elodea 12. The leaves of many of the plants in our ecocolumns turned yellow towards the end of the lab. Which of the following is NOT a possible reason for this a. Nitrogen was used at a faster rate than it was replenished through nitrogen fixation b. Nitrogen was used at a faster rate than it was replenished by decomposition C. Nitrogen was used at a faster rate than it was replenished by the cilantro d. Too much competition from plants for nutrients and this caused nutrient depletion

Answer 1

7. **c. Buried a dead fish in the terrestrial chamber.** While regular watering is essential and extra water might provide a temporary boost, a dead fish acts as a natural fertilizer, providing a significant influx of nutrients that can cause a spike in plant growth. Increased temperature could also help, but nutrient availability is often the limiting factor.8. **d. Bacterial decomposition of the fish used up the dissolved oxygen.** Decomposers, like bacteria, require oxygen for their metabolic processes. When a dead fish is present, the bacterial population increases to break down the organic matter, consuming more oxygen in the process and thus lowering the dissolved oxygen levels.9. **b. 5mg/l.** While some organisms can tolerate lower levels, 5mg/l is generally considered the minimum dissolved oxygen level required for most aquatic life to thrive.10. **b. To provide terrestrial plants with nitrate and phosphates produced in fish waste.** Fish waste is broken down by bacteria into nitrates and phosphates, which are essential nutrients for plant growth. Watering the terrestrial chamber with aquatic chamber water effectively recycles these nutrients.11. **c. Dissolved from the air and photosynthesis of elodea.** Elodea, being an aquatic plant, photosynthesizes and releases oxygen into the water. Oxygen also dissolves into the water from the air at the water's surface.12. **c. Nitrogen was used at a faster rate than it was replenished by the cilantro.** Cilantro, like other plants, *consumes* nitrogen for growth. It doesn't fix atmospheric nitrogen or replenish it in the soil. Nitrogen fixation is primarily carried out by certain bacteria, and decomposition also releases nitrogen back into the system.

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