M.Sc Botany

It depends on two things:
1. You improve your results with all hard work and planning to study.
2. It depends how much competition you face.
It is possible to get if you keep. Your knowledge is strong. Entrance will be easy for one who has studied well.

depend on your profession after B.Sc botany.

Sonali, I would suggest for Microbiology. It is a growing field and already opening for it are on the increase. Research based industry which is into developing products / processes through Biotechnology would be the ideal for you to make a career.

Ambika, there are many good govt.and private universities around you that are offering M.Sc Botany.
In some of them you need to give entrance test for admission and in some its direct admission or admission based on merit.
Admissions in most of them have started so check their websites for more details.
Good luck.