B.Sc

For B.Sc. course, the college has an online application system through a facility on its website. This facility is made available from second half of May. An incomplete application will not be considered for admission.
All applications for admissions to any UG course should be submitted by the date notified by the College. Late applications may not be accepted.
The University of Mumbai has made it mandatory for all candidates seeking admission to the First year courses in the Degree Colleges to fill in the Pre Admission Online Registration Form is available on mum.digitaluniversity.ac
Actual admissions to all courses will be on the announced days, through an interview of the candidate and a parent / guardian. The offer of admission will be notified on the website, on the College Notice Board.
The basic eligibility criteria of B.Sc. at St. Xavier's College Mumbai is HSC with minimum 45% of marks and the admission will be based on merit (12th Marks). The minimum cutoff marks of B.Sc. course is very high (about 90%) for admission. Hence you have to score above 92% of marks in your HSC for admission here.
So keep in close touch with the college website regarding the admission updates.
http://xaviers.edu/

You have not write about the name of College/University where you wants to pursue the B.Sc. Hons biochemistry course. However, the eligibility criteria of University of Delhi for asked course is given below for reference only.
Eligibility criteria : Candidates seeking admission to B.Sc. Biochemistry (Hons. ). Should have passed Senior School Certificate Examination (class XII of the Central Board of Secondary Education or an examination recognised as equivalent thereto. A candidate must have obtained 55% or more marks in the aggregate of Chemistry, Biology/Biotechnology, Physics/Mathematics. I. e. PCB or CBM (Practical & Theory together) and Passed in one compulsory language (I. e. English). So from above your marks are enough to apply the B.Sc. Hons biochemistry course. However, the admission is subjected to meeting the Cutoff/ Entrance criteria as applicable.

If you are asking about ANGRAU, then University offers M.Sc. (Ag) in Agriculture Economics, Agriculture extension, Agriculture statistics and Agriculture Microbiology courses. The University does not offers M.Sc. Horticulture course. The eligibility criteria for M.Sc. (Ag) is B.Sc. (Ag. ). / B.Sc. (CA&BM) of 4 years duration with minimum OGPA of 5.50 / 10.00 (SC/ ST- 5.00/10.00) or 2.50 / 4.00 (SC / ST-2.00 / 4.00) or 50% marks in traditional system (SC / ST- 40%). Age limit : The upper age limit is 40 years as on 1st July of the year of admission. Criteria for Selection: M.Sc. (Ag. ). : The selection shall be based on the previous academic record at Under Graduate level and performance in entrance test and the weightage would be in the ratio of 30:70. The entrance test shall be comprehensive one, covering all relevant subjects prescribed for the concerned Bachelor degree requirements of this University. Candidates seeking admission into any of the following Master's Degree courses must have passed the relevant Bachelor's Degree examination specified against each course from the Acharya N. G. Ranga Agricultural University or from any State Agricultural University (SAU) or Central Agricultural University (CAU). So University required the B.Sc. Passed candidates for asked courses. Hence you can not apply.