The diagram (described in text) shows a cross-section of a human lung alveolus and a fish gill filament.
A plant with purple flowers and round leaves (heterozygous for both traits) is self-crossed.
A student uses a respirometer to measure oxygen consumption in crickets at 20°C and 30°C. singapore junior biology olympiad past papers
(a) State the genotype of the parent plant. (1 mark)
(c) The student forgot to include a control vial with glass beads (no crickets). Explain why a control is necessary. (2 marks) The diagram (described in text) shows a cross-section
In Arabidopsis thaliana , flower color is controlled by a single gene with two alleles: Purple (P) dominant over white (p). Another unlinked gene controls leaf shape: Round (R) dominant over pointed (r).
(a) Draw a labeled diagram of a simple respirometer suitable for this experiment. (3 marks) (a) State the genotype of the parent plant
(d) If the experiment used germinating mung beans instead of crickets, how would the results differ? Why? (2 marks)
