Finding question papers specifically for the practical or laboratory-based questions in the Zoology optional subject can be a challenging task. However, there are a few ways to approach this and gather relevant material for preparation. Here is a detailed explanation on how to find question papers for practical or laboratory-based questions in Zoology:

1. Online Platforms and Forums:
- Search for online platforms and forums that specialize in providing study material for UPSC exams, such as EduRev.
- These platforms often have a dedicated section for previous year question papers, including practical and laboratory-based questions.
- Explore these platforms and forums to find question papers specifically related to the Zoology optional subject.

2. Official UPSC Websites:
- Visit the official website of the Union Public Service Commission (UPSC).
- Look for the "Previous Year Question Papers" section on the website.
- Although the UPSC website may not provide question papers specifically categorized for practical or laboratory-based questions, it is still worth checking as there might be some questions related to practical aspects of Zoology.

3. Offline Sources:
- Visit local bookstores or educational institutes that specialize in UPSC exam preparations.
- Look for books or study materials that specifically focus on the Zoology optional subject.
- These study materials often contain previous year question papers, including practical and laboratory-based questions.

4. Join Study Groups or Coaching Institutes:
- Join online or offline study groups that focus on UPSC exam preparations.
- These study groups often share study materials and question papers among their members.
- Similarly, coaching institutes that provide UPSC exam coaching may have study materials and question papers for the Zoology optional subject, including practical or laboratory-based questions.

Remember to verify the authenticity and relevance of the question papers before using them for preparation. It is also important to practice solving these questions within a given time frame to enhance your time management skills during the actual exam.

By following these approaches, you can gather question papers specifically for the practical or laboratory-based questions in the Zoology optional subject, enabling you to prepare more effectively for the UPSC exam.