Based on the curriculum for this age group in 2017, the championship likely included:
“In some large taxa, such as Mollusca, there are groups specialized for freshwater. Identify the primary physiological challenge these organisms face compared to their marine ancestors.” molodezhnyi biologicheskii chempionat 6-7 klassy 2017 god
A major hub for Russian biology competitions that keeps an extensive Archive of 2017 Tasks for similar tournaments like the Tournament of Young Biologists (TYB). Typical "Piece" (Sample Question Style) Based on the curriculum for this age group
Турнир юных биологов - Олимпиада.ру such as Mollusca
This is the primary organizer. They often archive past championships on their Official Website under the "Biology" or "Archive" sections.