to meet the demands of the society, production of a large number of plantlets in a short duration is practised in vitro floriculture and horticulture industry today. This is called

Options

A. Micropropagation
B. Macropropagation
C. Clonal propagation
D. Organography

Answer

To solve the question regarding the production of a large number of plantlets in a short duration in the in vitro floriculture and horticulture industry, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Context**: The question refers to a method used in the floriculture and horticulture industries to produce numerous plantlets quickly. This method is conducted under controlled laboratory conditions (in vitro).

2. **Identifying Key Terms**: The term "in vitro" indicates that the process occurs outside of a living organism, typically in a controlled environment such as a laboratory.

3. **Exploring Options**:
- **Micropropagation**: This is a technique that involves the rapid multiplication of plantlets from a small piece of plant tissue. It allows for the production of many identical plants in a short time.
- **Macropropagation**: This involves larger pieces of plant material and is not as efficient for producing large numbers of plantlets quickly.
- **Clonal Propagation**: This is a type of asexual reproduction that produces genetically identical plants but does not specifically refer to the in vitro method.
- **Organography**: This is the study of plant organs and is not related to plant propagation.

4. **Selecting the Correct Answer**: Based on the definitions and context, the correct term for the process of producing a large number of plantlets in vitro is **Micropropagation**.

5. **Finalizing the Answer**: Therefore, the answer to the question is **Micropropagation**.

### Final Answer:
The process of producing a large number of plantlets in a short duration in vitro is called **Micropropagation**.