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

Options

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

Answer

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

### Step-by-Step Solution:

1. **Identify the Organisms**: The list of organisms provided is:
- Lactobacillus
- Nostoc
- Chara
- Nitrosomonas
- Nitrobacter
- Streptomyces
- Saccharomyces
- Trypanosoma
- Porphyra
- Wolffia

2. **Classify Each Organism**:
- **Lactobacillus**: This is a heterotroph; it depends on other organic matter for food.
- **Nostoc**: This is an autotroph; it is capable of photosynthesis and synthesizes its own food.
- **Chara**: This is also an autotroph; it is a green algae that performs photosynthesis.
- **Nitrosomonas**: This is a chemoautotroph; it obtains energy from the oxidation of ammonia and can synthesize its own food.
- **Nitrobacter**: This is another chemoautotroph; it oxidizes nitrites to obtain energy and can also synthesize its own food.
- **Streptomyces**: This is a heterotroph; it relies on organic matter for nutrition.
- **Saccharomyces**: This is a saprophytic heterotroph; it feeds on decaying organic matter.
- **Trypanosoma**: This is a parasite; it depends on other organisms for nutrition.
- **Porphyra**: This is an autotroph; it is a type of red algae that performs photosynthesis.
- **Wolffia**: This is an autotroph; it is a small aquatic plant that also performs photosynthesis.

3. **Count the Autotrophs**: From the classifications:
- Autotrophs: Nostoc, Chara, Nitrosomonas, Nitrobacter, Porphyra, Wolffia
- Total Autotrophs: 6 (Nostoc, Chara, Nitrosomonas, Nitrobacter, Porphyra, Wolffia)

4. **Conclusion**: There are 6 organisms in the list that are autotrophs.

### Final Answer:
**6 organisms are autotrophs.**

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