In which of the following , respiration in the absence of oxygen also takes place ?

Options

A. Man
B. Potato
C. Yeast
D. Spirogyra

Answer

To solve the question "In which of the following, respiration in the absence of oxygen also takes place?" we will analyze each option provided: man, potato, yeast, and Spirogyra.

### Step-by-Step Solution:

**Step 1: Understand the Types of Respiration**
- Respiration can be classified into two types: aerobic respiration and anaerobic respiration.
- Aerobic respiration occurs in the presence of oxygen, while anaerobic respiration occurs in the absence of oxygen.

**Step 2: Analyze Each Option**
- **Man**: Humans primarily rely on aerobic respiration. While they can undergo anaerobic respiration (like during intense exercise), it is not the primary mode of respiration.

- **Potato**: Potatoes undergo aerobic respiration when oxygen is available. They can also perform anaerobic respiration, but this is not their primary mode of energy production.

- **Yeast**: Yeast is well-known for its ability to perform anaerobic respiration (fermentation). In the absence of oxygen, yeast converts glucose into ethanol and carbon dioxide, making it a prime example of anaerobic respiration.

- **Spirogyra**: This is a type of green algae that primarily performs photosynthesis and aerobic respiration. It does not typically undergo anaerobic respiration.

**Step 3: Conclusion**
- Among the options provided, yeast is the organism that primarily carries out respiration in the absence of oxygen. Therefore, the correct answer is **yeast**.

### Final Answer:
Yeast is the organism in which respiration in the absence of oxygen also takes place.

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