Dear aspirant,

Yes , for sure you can take up msc biology without the mathematics subject. Generally only 50-60% is required in your graduation course to apply for the colleges or entrance examinations.

But these entrance examination cut offs depends on certain factors like number of candidates appearing in the examination, number of vacant seats in college, previous years cut offs and difficulty level of the paper.

But on a general basis if you are good in your area of domain definitely you will excel in your work