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

Options

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

Answer

To determine how many organisms from the provided list are autotrophs, we will first identify each organism and classify them as either autotrophic or heterotrophic.

### Step-by-Step Solution:

1. **Understand Autotrophs**: Autotrophs are organisms that can produce their own food through processes like photosynthesis or chemosynthesis. Examples include plants, algae, and certain bacteria.

2. **List the Organisms**: The organisms provided in the question are:
- Lactobacillus
- Nostoc
- Chara
- Nitrosomonas
- Nitrobacter
- Streptomyces
- Saccharomyces
- Trypanosoma
- Porphyra
- Wolffia

3. **Classify Each Organism**:
- **Lactobacillus**: Heterotroph (a type of bacteria that ferments sugars).
- **Nostoc**: Autotroph (a cyanobacterium capable of photosynthesis).
- **Chara**: Autotroph (a green algae that performs photosynthesis).
- **Nitrosomonas**: Autotroph (a bacterium involved in the nitrogen cycle).
- **Nitrobacter**: Autotroph (another bacterium involved in the nitrogen cycle).
- **Streptomyces**: Heterotroph (a genus of bacteria known for antibiotic production).
- **Saccharomyces**: Heterotroph (a yeast that ferments sugars).
- **Trypanosoma**: Heterotroph (a parasitic protozoan).
- **Porphyra**: Autotroph (a type of red algae used in sushi).
- **Wolffia**: Autotroph (the smallest flowering plant, also known as watermeal).

4. **Count the Autotrophs**: From the classifications:
- Autotrophs: Nostoc, Chara, Nitrosomonas, Nitrobacter, Porphyra, Wolffia
- Total Autotrophs = 6

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