Hi Vishakha,
You can choose any specialization after B.Sc. zoology according to your preferences. The important thing is to understand what subjects you like and what are the fields you would like to work in education.
If you want to get into teaching then pursuing M.Sc is a better proposition for you. Likewise, you can choose options that you are interested in rather than choosing subjects on the basis of popular demand.
All the best!
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