Singapore Junior Biology Olympiad Past Papers Online

(d) Name the principle illustrated by the independent assortment of these two genes. (1 mark)

A student uses a respirometer to measure oxygen consumption in crickets at 20°C and 30°C.

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

Below is a structured set of original questions (Section A: Multiple Choice, Section B: Structured/Free Response), followed by a detailed answer key and performance analysis guide. Subject: Junior Biology Olympiad Time: 1 hour 30 minutes (simulated) Total Marks: 60 Section A: Multiple Choice (30 marks) Questions 1 to 15. Each correct answer earns 2 marks. Select the single best answer. singapore junior biology olympiad past papers

The diagram (described in text) shows a cross-section of a human lung alveolus and a fish gill filament.

(c) If 320 offspring are produced, how many are expected to have purple flowers and pointed leaves? Show your working. (2 marks)

(a) List two structural adaptations of the alveolus that maximize gas exchange. (2 marks) (d) Name the principle illustrated by the independent

A plant with purple flowers and round leaves (heterozygous for both traits) is self-crossed.

(a) Draw a labeled diagram of a simple respirometer suitable for this experiment. (3 marks)

(d) If the experiment used germinating mung beans instead of crickets, how would the results differ? Why? (2 marks) (4 marks) Below is a structured set of

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

(c) The student forgot to include a control vial with glass beads (no crickets). Explain why a control is necessary. (2 marks)