Hey,

The non-major subjects under b.sc zoology are communication skills and environmental studies along with some generic subjects which are elective.

The detailed information about the complete syllabus is available on the site and you can get the insight of the complete syllabus by visiting the link below:

http://du.ac.in/du/uploads/Syllabus_2015/B.Sc.%20Hons.%20Zoology.pdf

I hope this helps.

All the best!