Hi Soumi,

All fields of biology have bright scope.Botany, zoology, agriculture, biotechnology, bio informatics, psychology Immunology, veterinary, medical , dentistry etc . All are extremely good options. You should first find out the subject you are passionate about and then pursue it.
Research options are available in all of them.In India agricultural sciences and veterinary offers immense reasearch potential.
ICAR , National institute of immunology ,National institute of virology are some big institutes doing reasearch.
Hope this helps