Educational qualifications required for appearing in the CSE as mentioned in the official UPSC notification:
1. A degree of any of the Universities incorporated by an Act of the Central or State Legislature in India or other educational institutions established by an Act of Parliament or declared to be deemed as a University under Section 3 of the University Grants Commission Act, 1956, or possess an equivalent qualification.
The notification further mentions that candidates who have obtained their degrees through Open and Distance Learning (ODL) mode of education are also eligible for appearing in the UPSC examinations provided they have a valid Bachelor's degree as specified above.
Therefore, if you have completed your B.Sc in Botany Honours from a recognized university or educational institution, you are eligible to apply for the UPSC exams, including the CSE. However, it's essential to note that along with the educational qualification, there are other eligibility criteria that you need to fulfill, such as age limit, nationality, physical fitness, and the number of attempts you are entitled to.
To get more detailed information about the UPSC exams, including the eligibility criteria, syllabus, and exam pattern, you can refer to the official UPSC website or the UPSC exam notifications published from time to time.