Hello Aisha
Yess there are many colleges in Mumbai offering Bachelor's in Science (ZOOLOGY) in Mumbai. I am listing a few colleges here. Hope it helps.

Bhavan's College, Munshi Nagar, Andheri(West)
DG Ruparel College of Arts, Science and Commerce, Senapati Bapat Marg, Mahim
Dr. Babasaheb Ambedkar College of Arts, Commerce and Science, Mumbai Goa Highway
Guru Nanak Khalsa College of Arts, Science and Commerce, Matunga East Mumbai
ICLES Motilal Jhunjhunwala Colleges, Vashi, Navi Mumbai
Maharashtra College of Arts, Science and Commerce, Bellasis Road