________ is a taxonomic aid which contains the actual account of habitat and distribution of plants of a given area and also provides the index to the plant species found in a particular area. flora, key, monograph, manual.

Options

A. Flora
B. Key
C. Monograph
D. Manual

Explanation

To solve the question, we need to identify which of the given options describes a taxonomic aid that contains information about the habitat and distribution of plants in a specific area, along with an index of the plant species found there. Let's analyze each option step by step:

1. **Understanding the Options**:
- **Flora**: This term refers to a comprehensive account of the plant species in a particular area, including their habitat and distribution.
- **Key**: A tool used for identifying organisms based on contrasting characteristics, but it doesn't provide habitat or distribution information.
- **Monograph**: A detailed written study of a single taxon, but it does not cover multiple species or their distribution in a specific area.
- **Manual**: A guide that provides information for identifying species, but it does not focus on habitat and distribution.

2. **Analyzing the Question**:
The question specifically asks for a taxonomic aid that includes:
- An account of habitat
- Distribution of plants
- An index to plant species in a particular area

3. **Matching the Definition**:
- **Flora** fits perfectly as it provides the actual account of habitat and distribution of plants in a given area and includes an index of the plant species.

4. **Conclusion**:
Based on the definitions and the requirements stated in the question, the correct answer is **Flora**.

### Final Answer:
**Flora**