B.Sc Botany

It will not affect much as at most of the places theses are equivalent sparring those which require honours only. If you are interested in botany only then consider going for M.Sc in botany.

I am also a class 12th student seeking for admission and I also got 81%. I think our destination is same.
I think we should wait for the DU cut-off, maybe in some courses like life sciences, we will get admission. Otherwise, we can find out some good private universities.

M.Sc botany, M.Sc in plants and biotechnology, etc.

Hi,
In today's world, just having a B.Sc degree is not really enough especially if you want to make a good career. You can do your Masters in Botany, Biotechnology, Biochemistry, Horticulture, Mic radiology, etc.
There are various colleges which give you this course based only on your B.Sc graduation marks.
State level entrances also start from December like:
TIFR
JNU
BARODA University

There are numerous careers in botany, including soil and plant scientist, biophysicist and biochemist, biological technician, environmental scientist and specialist, mycologist, plant breeder and horticulturist. While a Bachelor's degree might get you started in this field, a Master's degree or doctorate is generally needed to advance.
I would suggest you to startup with a job and am sure you will start liking it and do Masters with distance learning.