There are several mock tests available for the case study-based questions in Botany Optional. These mock tests are designed to help candidates prepare for the Botany Optional section of the UPSC exam. Below, I will provide details about these mock tests and their availability.

1. EduRev:
EduRev is a popular online learning platform that offers a wide range of resources for UPSC exam preparation. They provide mock tests specifically designed for the case study-based questions in Botany Optional. These mock tests cover various topics and provide candidates with an opportunity to practice and assess their knowledge and understanding of the subject.

2. Testbook:
Testbook is another online learning platform that offers mock tests for various competitive exams, including UPSC. They also provide mock tests for the Botany Optional section, which include case study-based questions. These mock tests are designed to simulate the actual exam environment and help candidates evaluate their preparation level.

3. Unacademy:
Unacademy is a popular online education platform that offers a wide range of courses and resources for UPSC exam preparation. They provide mock tests for the Botany Optional section, including case study-based questions. These mock tests are designed to help candidates familiarize themselves with the exam pattern and improve their problem-solving skills.

4. BYJU's:
BYJU's is a well-known online learning platform that offers comprehensive courses and resources for UPSC exam preparation. They also provide mock tests for the Botany Optional section, including case study-based questions. These mock tests are designed to help candidates identify their strengths and weaknesses and provide them with an opportunity to improve their performance.

Overall, these mock tests are valuable resources for candidates preparing for the case study-based questions in Botany Optional. They provide an opportunity to practice and assess their knowledge and understanding of the subject, as well as improve their problem-solving skills. Candidates should make use of these mock tests to enhance their preparation and increase their chances of success in the UPSC exam.