There are several strategies that can help you score well in the practical/field-based questions in Paper I of the UPSC Zoology Optional subject. These tips will help you effectively demonstrate your knowledge and understanding of practical aspects of zoology:

1. Focus on Field Experiences:
- Actively participate in fieldwork and gain practical experience in various zoological surveys, animal behavior studies, and ecological investigations.
- Keep a record of your field experiences, including observations, data collection techniques, and analysis methods.
- Reflect on your field experiences and critically analyze the outcomes, limitations, and potential improvements.

2. Master Practical Techniques:
- Familiarize yourself with various field techniques used in zoology, such as trapping, tagging, radio telemetry, mark-recapture methods, and sampling techniques.
- Understand the principles, applications, and limitations of each technique.
- Practice these techniques through hands-on experiences or simulated scenarios to enhance your proficiency.

3. Stay Updated with Current Research:
- Stay informed about the latest research in the field of zoology, especially studies related to practical aspects.
- Read scientific papers, articles, and journals to understand the methodologies, findings, and implications of research studies.
- Keep track of emerging technologies and their applications in zoological research.

4. Develop Analytical Skills:
- Practice data analysis techniques commonly used in zoological studies, such as statistical analyses, graphical representation, and interpretation of results.
- Learn how to use software and tools like Excel, R, or SPSS for data analysis.
- Develop the ability to identify patterns, draw conclusions, and make inferences from collected data.

5. Enhance Communication Skills:
- Clearly and concisely communicate your field experiences, methodologies, findings, and interpretations in a structured and coherent manner.
- Use appropriate scientific terminology and present data in tabular or graphical formats whenever necessary.
- Practice writing field reports, research papers, and summaries to improve your scientific writing skills.

6. Revise and Practice Previous Year Question Papers:
- Familiarize yourself with the pattern and types of questions asked in the practical/field-based section of the UPSC Zoology Optional Paper I.
- Solve previous year question papers and simulate exam-like conditions to improve your time management and question-answering skills.
- Analyze your performance, identify areas of improvement, and revise accordingly.

By following these tips, you can enhance your practical knowledge, analytical skills, and overall performance in the practical/field-based questions of the UPSC Zoology Optional Paper I. Remember to approach these questions with a scientific mindset, attention to detail, and a thorough understanding of practical aspects of zoology.