Singapore Junior Biology Olympiad Past Papers (2025)

(b) Explain the concept of countercurrent exchange in fish gills and explain why it is more efficient than concurrent flow. (4 marks)

(c) The student forgot to include a control vial with glass beads (no crickets). Explain why a control is necessary. (2 marks) singapore junior biology olympiad past papers

(b) Using a Punnett square or branch diagram, determine the phenotypic ratio of the offspring. (4 marks) (b) Explain the concept of countercurrent exchange in

(d) If the experiment used germinating mung beans instead of crickets, how would the results differ? Why? (2 marks) singapore junior biology olympiad past papers