In hardening process :-

Options

A. Plantlet is placed in reduced light and high humidity for short time
B. Plantlet is placed in favourable conditions for long time
C. Plantlet is transfer in new fresh medium
D. Plantlet is placed in highlight intensity

Answer

### Step-by-Step Solution:

1. **Understanding the Hardening Process**:
- The hardening process is essential for acclimatizing plantlets that have been grown in vitro (in a controlled environment) to the external environment. This process helps the plantlets adjust to conditions such as temperature, light, and humidity.

2. **Identifying the Correct Conditions for Hardening**:
- During hardening, plantlets should be placed in conditions that mimic their natural environment but are not too harsh. This typically involves reduced light intensity and high humidity.

3. **Evaluating the Options**:
- **Option A**: Plantlets are placed in reduced light and high humidity for a short time.
- **Option B**: Plantlets are placed in favorable conditions for a long time.
- **Option C**: Plantlets are transferred to a new fresh medium.
- **Option D**: Plantlets are placed in high light intensity.

4. **Analyzing Each Option**:
- **Option A** is correct because it describes the ideal conditions for hardening, which involve reduced light and high humidity for a short duration.
- **Option B** is incorrect as favorable conditions for a long time may not help in acclimatization.
- **Option C** is incorrect because transferring to a new medium does not relate to the hardening process.
- **Option D** is incorrect as high light intensity can stress the plantlets.

5. **Conclusion**:
- The correct answer is **Option A**: Plantlets are placed in reduced light and high humidity for a short time.