Hey Ayushi,
Delhi University is a public central university offering many UG and PG courses. The university gives admission to students having high merit in HSC examinations, also entrance based admission are given.
Admission to B.Sc. Zoology is based on some eligibility criterias like :

• Candidate must have passed 12th examinations with Physics, Chemistry and Biology/Biotechnology as compulsory subjects
• Candidate must have scored minimum 55% marks or more in aggregate in 3 main subjects and 50% marks in the language subject i.e. English.
• The admission to the course is based on merit in the qualifying examination.

So, it is clear that there is no entrance exam conducted by the university for admission to this course.

• All the Best!