How many organism in the list given below are autotrophs Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomuces, Sacharomyces, Trypanosoma, Porphyra Wolfia

Options

A. Six
B. Three
C. Four
D. Five

Answer

To determine how many organisms in the given list are autotrophs, we will analyze each organism based on their nutritional mode.

1. **Lactobacillus**: This is a genus of bacteria that are heterotrophic, meaning they obtain their food by consuming organic substances. **(Not an autotroph)**

2. **Nostoc**: This is a genus of cyanobacteria, which are known to be autotrophic. They can perform photosynthesis and produce their own food. **(Autotroph)**

3. **Chara**: This is a genus of green algae that is also autotrophic. They perform photosynthesis and produce their own food. **(Autotroph)**

4. **Nitrosomonas**: This is a genus of bacteria that are chemolithoautotrophs. They oxidize ammonia to obtain energy and can produce their own food. **(Autotroph)**

5. **Nitrobacter**: Similar to Nitrosomonas, Nitrobacter is also a genus of bacteria that are chemolithoautotrophs. They oxidize nitrites to obtain energy and can produce their own food. **(Autotroph)**

6. **Streptomyces**: This is a genus of bacteria that are primarily heterotrophic, as they feed on organic matter. **(Not an autotroph)**

7. **Saccharomyces**: This is a genus of yeast that is heterotrophic, as it obtains its nutrients from organic sources. **(Not an autotroph)**

8. **Trypanosoma**: This is a genus of parasitic protozoa that are heterotrophic, as they derive nutrients from their hosts. **(Not an autotroph)**

9. **Porphyra**: This is a genus of red algae that is autotrophic. They perform photosynthesis and produce their own food. **(Autotroph)**

10. **Wolffia**: This is a genus of tiny aquatic plants (duckweed) that are autotrophic. They also perform photosynthesis. **(Autotroph)**

Now, let’s count the autotrophs from the list:
- Nostoc
- Chara
- Nitrosomonas
- Nitrobacter
- Porphyra
- Wolffia

Total autotrophs = 6

**Final Answer**: There are 6 autotrophic organisms in the list.