Participation in science competitions doesn't result in direct marks addition to your 10th board exam marks according to the general norms followed by most Indian education boards.

However, these achievements are commendable and can definitely be highlighted in your academic achievements section for higher education applications or scholarships.  These  showcase your talent, interest, and initiative in science, which can be very valuable.

By highlighting these achievements, you can impress admissions committees and scholarship providers even though they don't directly translate into extra marks.

I hope it helps!