SL Paper 3
The oxygen consumption rate of the fish Oplegnathus insignis was examined in a respirometer at three different water temperatures and at four different body masses.
Suggest how the oxygen consumption rate is determined using this apparatus.
State the relationship between body mass and the oxygen consumption of fish.
Predict the effects of global warming on aerobic respiration in fish.
White sage (Salvia apiana) is a native Californian shrub. Slender oat (Avena barbata) is a grass, originally from the Mediterranean, which was introduced to California. The map shows the distribution of the two species in relation to one another in an area near Santa Ynez, California.
Using the scale bar, determine the area of quadrat A1, giving the units.
Outline how chi-squared can be used to test for an association between the distributions of the two species.
When feed for animals is stored, moisture levels need to be kept low to prevent the growth of fungi. Feed was exposed to 15 % moisture and placed into a respirometer. O2 consumption was monitored using the respirometer over a period of six days.
[Source: © International Baccalaureate Organization 2019]
Outline how O2 consumption is measured using a respirometer.
Suggest one conclusion that can be drawn from the results shown in the graph.
Other than humidity, suggest a variable that would need to be controlled in this experiment.
Outline the role of fungi in nutrient cycling.