underlined word or words to make the statement true. page 111-112
true ______ 10. nitrogen fixation is the process in which certain bacteria convert nitrogen gas into no₃⁻.
true ______ 11. denitrification is the process by which some soil bacteria convert no₃⁻ and no₂⁻ into nitrogen gas.
______ 12. all organisms require nitrogen to make amino acids, which in turn are used to build carbohydrates.
______ 13. plants absorb phosphate from the soil or from water.
______ 14. phosphorus is the most abundant gas in the atmosphere.
______ 15. organic phosphate is taken up by producers during photosynthesis and released by cellular respiration.
16. list all the processes in the carbon cycle which move carbon into the atmosphere. (at least 3)
17. list all the processes in the carbon cycle which move carbon out of the atmosphere. (at least 3)
18. nitrogen is often a limiting nutrient (factor) in an ecosystem (see page 113). explain what might happen when humans artificially add too much nitrogen nutrients
un off\ into aquatic ecosystems. (hint: think (look up) red tide!)

Question

Accepted Answer

### Question 12
# Brief Explanations:
Amino acids are used to build proteins, not carbohydrates. So we need to change "carbohydrates" to "proteins". Also, not all organisms can fix nitrogen or obtain nitrogen in all forms, but the main error is the macromolecule built from amino acids.
# Answer:
Change "carbohydrates" to "proteins" (and "All" can be discussed, but the key underlined error is "carbohydrates" → "proteins")

### Question 13
# Brief Explanations:
Plants absorb phosphate from the soil or water, this statement is true? Wait, no, the original has a blank. Wait, the statement "Plants absorb phosphate from the soil or from water" is true? Wait, maybe the underlined word was wrong. Wait, maybe the original had a wrong word. Wait, actually, plants do absorb phosphate from soil (via roots) or water (in aquatic plants). So if the blank is for a true/false correction, maybe it's "true"? Wait, the original has a blank. Wait, maybe the underlined word was incorrect. Wait, maybe the original had a different word. Assuming the underlined word was wrong, but the correct statement is that plants absorb phosphate from soil or water, so if the blank is to write "true", then:
# Answer:
true

### Question 14
# Brief Explanations:
The most abundant gas in the atmosphere is nitrogen (N₂), not phosphorus. So we change "Phosphorus" to "Nitrogen".
# Answer:
Change "Phosphorus" to "Nitrogen"

### Question 15
# Brief Explanations:
Carbon dioxide (not organic phosphate) is taken up by producers during photosynthesis and released by cellular respiration. So we change "Organic phosphate" to "Carbon dioxide".
# Answer:
Change "Organic phosphate" to "Carbon dioxide"

### Question 16
# Brief Explanations:
Processes that move carbon into the atmosphere: 1. Cellular respiration (all living organisms release CO₂). 2. Combustion (burning of fossil fuels, wood releases CO₂). 3. Decomposition (decomposers break down organic matter, release CO₂). 4. Volcanic activity (releases CO₂ from Earth's interior).
# Answer:
1. Cellular respiration (organisms release CO₂). 2. Combustion (fossil fuels, biomass burning). 3. Decomposition (decomposers release CO₂).

### Question 17
# Brief Explanations:
Processes that move carbon out of the atmosphere: 1. Photosynthesis (producers take in CO₂ to make glucose). 2. Ocean absorption (CO₂ dissolves in ocean water, forms carbonates). 3. Carbon sequestration (long - term storage in soil, fossil fuels formation over time).
# Answer:
1. Photosynthesis (producers absorb CO₂). 2. Ocean uptake (CO₂ dissolves in oceans). 3. Carbon sequestration (soil, sediment storage).

### Question 18
# Brief Explanations:
When excess nitrogen (e.g., from fertilizer runoff) enters aquatic ecosystems, it causes eutrophication. Algae and aquatic plants grow rapidly (algal bloom). When they die, decomposers use up oxygen in the water during decomposition, leading to hypoxia (low oxygen). This can kill fish and other aquatic life. Red tide (harmful algal bloom) can also occur, producing toxins that harm marine life and humans.
# Answer:
Excess nitrogen causes eutrophication: algal blooms, then oxygen depletion (hypoxia) as algae die and decompose, killing aquatic life. Can also trigger red tides (harmful algal blooms) with toxins.

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 12

Answer:

Question 13