To determine which option is correct regarding the classification of plant hormones as natural or synthetic, we will analyze the information provided in the video transcript step by step.
### Step-by-Step Solution:
1. **Understanding Plant Hormones**:
- Plant hormones, also known as phytohormones, are classified into two categories: natural and synthetic.
2. **Identifying Natural Hormones**:
- The video mentions that Indole-3-acetic acid (IAA) and Indole-3-butyric acid (IBA) are examples of natural plant hormones. These hormones are produced naturally within plants.
3. **Identifying Synthetic Hormones**:
- The synthetic hormones mentioned include Naphthalene acetic acid (NAA), 2,4-Dichlorophenoxyacetic acid (2,4-D), and 2,4,5-Trichlorophenoxyacetic acid (2,4,5-T). These hormones are not produced naturally in plants but are synthesized artificially.
4. **Analyzing the Options**:
- Option 1 states that IAA and IBA are natural, while NAA, 2,4-D, and 2,4,5-T are synthetic. This aligns with the information provided in the video.
- Other options incorrectly classify these hormones, stating that some of the synthetic hormones are natural or vice versa.
5. **Conclusion**:
- Based on the analysis, the correct option is Option 1, which accurately categorizes IAA and IBA as natural hormones and NAA, 2,4-D, and 2,4,5-T as synthetic hormones.
### Final Answer:
The correct option is **Option 1**: IAA and IBA are natural, while NAA, 2,4-D, and 2,4,5-T are synthetic.
