2a. which of the following facilitate nitrogen fixation, nitrification, and ammonification? choose an option a flightless birds b soil - dwelling bacteria c domesticated animals d tree - dwelling mammals 2b. select a clip from the video that supports your answer. learn how. create video clip 2c. explain the role these organisms play in these processes. write your answer here...

Question

Accepted Answer

### 2A
# Brief Explanations:
Nitrogen fixation, nitrification, and ammonification are key processes in the nitrogen cycle. Soil - dwelling bacteria are known to be involved in these processes. Flightless birds, domesticated animals, and tree - dwelling mammals do not play a role in these nitrogen - related processes. For example, nitrogen - fixing bacteria in the soil convert atmospheric nitrogen into a form usable by plants, nitrifying bacteria convert ammonia to nitrites and then nitrates, and ammonifying bacteria convert organic nitrogen to ammonia.
# Answer:
B. Soil - dwelling bacteria

### 2C
# Brief Explanations:
- **Nitrogen Fixation**: Certain soil - dwelling bacteria (like Rhizobium in root nodules of legumes or free - living bacteria like Azotobacter) are capable of converting atmospheric nitrogen ($N_2$) into ammonia ($NH_3$) or other nitrogen - containing compounds that can be used by plants. This is essential as plants cannot directly utilize atmospheric nitrogen.
- **Ammonification**: Decomposer bacteria (a type of soil - dwelling bacteria) break down organic matter (such as dead plants, animals, and waste products) that contains nitrogen. During this process, they convert the organic nitrogen (for example, in proteins, nucleic acids) into ammonia ($NH_3$) or ammonium ions ($NH_4^+$). This ammonia can then be used in other parts of the nitrogen cycle.
- **Nitrification**: Nitrifying bacteria (another group of soil - dwelling bacteria) are involved in two main steps. First, ammonia - oxidizing bacteria convert ammonia ($NH_3$) to nitrite ($NO_2^-$). Then, nitrite - oxidizing bacteria convert nitrite to nitrate ($NO_3^-$). Nitrate is a form of nitrogen that is easily taken up by plants and is an important source of nitrogen for plant growth.
# Answer:
Soil - dwelling bacteria play crucial roles in nitrogen fixation, ammonification, and nitrification:

- **Nitrogen Fixation**: Some soil bacteria (e.g., Rhizobium, Azotobacter) convert atmospheric $N_2$ into ammonia ($NH_3$) or ammonium ($NH_4^+$), making nitrogen available for plants (since plants cannot use $N_2$ directly).
- **Ammonification**: Decomposer bacteria break down organic nitrogen (from dead organisms, waste) into ammonia ($NH_3$) or $NH_4^+$, recycling nitrogen from organic matter back into the inorganic nitrogen pool.
- **Nitrification**: Nitrifying bacteria (e.g., Nitrosomonas, Nitrobacter) first convert $NH_3$/$NH_4^+$ to nitrite ($NO_2^-$), then nitrite to nitrate ($NO_3^-$). Nitrate is a plant - available form of nitrogen, supporting plant growth and the broader nitrogen cycle.

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Question

Explanation:

2A

Answer:

2C