Which of the following materials are not included in germplasm of any crop species?

Options

A. Cultivated improved varieties
B. Lines produced by plant breeders
C. Wild species related to the crop species
D. Mutant varieties containing recessive genes

Answer

To determine which materials are not included in the germplasm of any crop species, we need to understand what germplasm is and the nature of the options provided.

### Step-by-Step Solution:

1. **Understanding Germplasm**: Germplasm refers to the living genetic resources, such as seeds or tissues, that are maintained for breeding purposes. It includes the genetic material necessary for the development of new crop varieties.

2. **Evaluating the Options**:
- **Cultivated Improved Variety**: This is included in germplasm as it consists of genetically enhanced crops that have desirable traits.
- **Lines Produced by Plant Breeders**: These are also included in germplasm as they are developed to ensure purity and quality in crop production.
- **Wild Species Related to Crop Species**: These are included as they can contribute beneficial traits such as disease resistance or higher yield.
- **Mutant Variety Containing Recessive Genes**: This is the key option to evaluate. While mutant varieties can be part of germplasm, those that contain recessive genes may not be beneficial for crop production due to the potential for undesirable traits, such as susceptibility to diseases.

3. **Conclusion**: The material that is typically not included in the germplasm of any crop species is the **Mutant Variety Containing Recessive Genes**. This is because recessive genes can lead to negative traits that are not advantageous for crop development.

### Final Answer:
The material that is not included in the germplasm of any crop species is the **Mutant Variety Containing Recessive Genes**.