(a(i))[3]
Suggest why the graph line is steeper in phase B than in phase A.
(a(ii))[1]
Suggest why the graph line begins to level off in phase C.
(b)[5]
Explain how rice is adapted for growth with its roots submerged in water.
Biology 9700 · AS & A Level · Homeostasis in plants
Homeostasis in plants — practice question
(a) Isolated mitochondria were used to examine respiration.
• Mitochondria were taken from respiring mammalian cells and placed in a buffer solution.
• Pyruvate and inorganic phosphate (Pi) were added at time zero.
• ADP was added one minute later.
• The oxygen concentration of the buffer solution containing mitochondria was monitored for the whole investigation.
The results of the investigation are shown in Fig. 7.1.