Yes, many universities and colleges in India offer B.Sc. admissions based solely on Class 12th Board results (merit-based), especially for general B.Sc. courses.

The colleges listed on the dedicated resource page for Dehradun, and across the country, typically fall into these two admission categories:

1. Merit-Based (Board Results): Many government and state university-affiliated colleges use your 12th percentage as the primary criterion for admission (e.g., colleges under HNB Garhwal University or certain DU colleges for B.Sc. programs).

2. Entrance Exam-Based: Central/Private Universities (like some listed for Dehradun) often require a score in a national/state entrance test (e.g., CUET, university-specific exams) to qualify for admission.

To find merit-based B.Sc. options in and around Dehradun, check the admission criteria of the colleges listed here: https://university.careers360.com/colleges/list-of-bsc-degree-colleges-in-dehradun