hello,

yes mostly. biology covers both botany and zoology. It will make you a botany or zoology lecturer. it depends on what you choose to make your career in.

Better to get cleared by asking your teacher regarding it. They know regarding all these better as they are experienced. ask your friends too. how they have planned to make their career and how it will be beneficial for you if you will go for it.

after completion, you can apply for different institutes and colleges for job.

Hope it helps!