Using scientific terminology or vocabulary effectively in your answers in Paper II of UPSC Zoology Optional Subject is crucial for demonstrating your understanding of the subject matter and showcasing your knowledge to the examiner. Here are some tips on how to effectively incorporate scientific terminology in your answers:

1. Understand the Terminology: Before attempting to use scientific terminology, it is essential to have a complete understanding of the terms and concepts related to the topic. Make sure you have a strong grasp of the definitions and their applications.

2. Read Scientific Literature: Stay up-to-date with scientific literature, research papers, and textbooks related to zoology. This will expose you to a wide range of scientific vocabulary and help you familiarize yourself with the terminology commonly used in the field.

3. Use Terminology Contextually: When using scientific terminology, ensure that it is appropriate and relevant to the question being asked. Avoid using complex terminology unnecessarily and be mindful of the level of understanding expected from the examiner. Use the terminology to enhance your explanation rather than confusing the reader.

4. Define Key Terms: If you are using technical terms in your answer, provide a brief definition or explanation of those terms. This helps to ensure that the examiner understands your use of the terminology and demonstrates your knowledge of the subject matter.

5. Provide Examples: Whenever possible, provide examples or case studies to illustrate your understanding of the scientific concepts. This not only makes your answer more relatable but also showcases your ability to apply the terminology in real-world scenarios.

6. Use Diagrams or Illustrations: Visual aids such as diagrams, flowcharts, or tables can help reinforce your explanation and make it more visually appealing. Label the components using scientific terminology to demonstrate your understanding of the subject.

7. Practice Writing: Regular practice is essential to improve your ability to use scientific terminology effectively. Write mock answers and seek feedback from teachers or mentors to identify areas for improvement. As you gain more practice, your ability to incorporate scientific vocabulary will improve.

Remember, the key is to strike a balance between using scientific terminology to demonstrate your knowledge and ensuring clarity in your answers.