Which taxonomic aid gives comprehensive account of complete complied information of a genus or family at a particular time ?

Options

A. Taxonomic key
B. Herbarium
C. Monograph
D. All of these

Explanation

To answer the question "Which taxonomic aid gives comprehensive account of complete compiled information of a genus or family at a particular time?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for a taxonomic aid that provides a complete and comprehensive account of a genus or family at a specific time.

2. **Identify the Options**: The options provided are:
- Taxonomic key
- Herbarium
- Monograph
- All of the above

3. **Evaluate Each Option**:
- **Taxonomic Key**: This is a tool used for the identification of species based on their characteristics. It does not provide comprehensive information about a genus or family, so this option is not correct.

- **Herbarium**: A herbarium consists of dried and preserved plant or animal specimens mounted on sheets. While it serves as a reference for species identification, it does not compile comprehensive information about a genus or family, making this option incorrect as well.

- **Monograph**: A monograph is a detailed written study that provides a comprehensive account of a particular taxon, including all relevant information about a genus or family. This option fits the requirement of the question perfectly.

- **All of the Above**: Since the first two options (taxonomic key and herbarium) are incorrect, this option cannot be correct.

4. **Conclusion**: Based on the evaluations, the correct answer is **Monograph**, as it provides a complete compiled account of a genus or family at a particular time.

### Final Answer:
The correct option is **Monograph**.

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