a. Explain why the energy value of lipid is more than twice that of carbohydrate.

b. Explain what is meant by respiratory quotient (RQ).

c. Copy and complete the table to show the respiratory substrates with each of the given RQs.

Respiratory substrate	RQ
	1.0
	0.7
	0.9

d. Measurements of oxygen uptake and carbon dioxide production by germinating seeds in a respirometer showed that 25 cm3 of oxygen was used and 17.5 cm3 of carbon dioxide was produced over the same time period.

i. Calculate the RQ for these seeds.

ii. Identify the respiratory substrate used by the seeds.

e. Dahlia plants store a compound called inulin, which is a polymer of fructose. The structure of fructose is shown in the diagram.

Calculate the RQ when inulin is hydrolysed and then respired aerobically.

Transcribed Image Text:

CH,OH CH,OH но HO. OH