In the list of organisms given below, those that does not reproduce by the asexual method are _____

Options

A. spirogyra
B. dog
C. yeast
D. amoeba

Explanation

To determine which organism does not reproduce by asexual methods, we will analyze each option provided:

1. **Spirogyra**:
- Spirogyra primarily reproduces asexually through a process called fragmentation. In this method, the organism breaks into fragments, and each fragment can grow into a new individual.
- **Hint**: Look for organisms that can reproduce by breaking apart and forming new individuals.

2. **Yeast**:
- Yeast reproduces asexually through a process known as budding. In budding, a new organism develops from an outgrowth or bud on the parent organism.
- **Hint**: Identify organisms that can produce offspring from a part of themselves.

3. **Amoeba**:
- Amoeba reproduces asexually through binary fission. In this process, the amoeba divides into two equal parts, each becoming a new organism.
- **Hint**: Consider organisms that can split into two to create new individuals.

4. **Dog**:
- Dogs reproduce sexually. This method requires a male and a female to produce offspring.
- **Hint**: Look for organisms that require two parents for reproduction.

**Conclusion**: The organism that does not reproduce by asexual methods is the **Dog**.

**Final Answer**: Dog.