# Lesson Worksheet: Investigating Respiration Biology

In this worksheet, we will practice describing the methods and equipment used to investigate the rate of respiration in living organisms.

Q1:

As organisms respire aerobically, what gas do they give out?

• AOxygen
• BCarbon dioxide

Q2:

As organisms respire aerobically, what gas do they take in?

• ACarbon dioxide
• BOxygen

Q3:

A student is investigating the effect of temperature on the rate of respiration in mealworms. They place 3 respirometers containing mealworms into 3 water baths of different temperatures. Which of the following would be a suitable control variable for this experiment?

• AThe temperature
• BThe mass of mealworms
• CThe volume of water
• DThe light intensity

Q4:

Using a simple respirometer, a student investigated the rate of respiration of three sets of peas: frozen peas, germinating peas, and dormant peas (nongerminating).

Which of the following would have been a suitable control variable for this experiment?

• AThe concentration of nitrogen in the test tubes
• BThe distance moved by the colored liquid
• CThe temperature
• DThe amount of oxygen produced

In which set of peas would respiration have occurred at the highest rate?

• AGerminating peas
• BDormant peas
• CFrozen peas
• DAll sets respire at the same rate.

Q5:

Two respirometers, each containing the same mass of germinating peas, are set up. One is placed in a water bath at and the other at . At what temperature will the rate of cellular respiration be higher? Why?

• A, because the molecules involved in the reaction will be warmer
• B, because the molecules involved in the reaction will be cooler
• C, because the molecules involved in the reaction will be moving quicker
• D, because the molecules involved in the reaction will be moving quicker

Q6:

A science class used a simple respirometer to investigate the rate of respiration in maggots at different temperatures. The table provided shows their results, comparing the temperature to the distance the colored liquid in the respirometer moved.

 Temperature (∘C) Distance Moved (mm/min) 10 15 20 25 30 35 9 12 20 28 11 31

At what temperature were the results anomalous?

Q7:

A student sets up a respirometer to investigate the rate of respiration in maggots. Calculate the rate of respiration, in cubic millimeters per second, when the colored liquid moves 9 mm3 in 60 seconds. Give your answer to two decimal places.

Q8:

A student is investigating the rate of respiration for two different organisms: active woodlice and slow-moving wax worms.

What is the independent variable in this investigation?

• AThe mass of organisms
• BThe rate of respiration
• CThe temperature
• DThe type of organism

Q9:

A student used a simple respirometer to investigate the rate of respiration in maggots at different temperatures. The graph provided shows their results, comparing the temperature to the distance the colored liquid in the respirometer moved.

Which of the following correctly describes the trend shown?

• AAs the temperature increases, the rate of respiration increases.
• BThere is no correlation between the temperature and the rate of respiration.
• CAs the temperature decreases, the rate of respiration increases.

What was the distance traveled by the colored liquid when the temperature was ?

Q10:

The diagram provided shows the setup of a simple respirometer.

What is the role of soda lime in this experiment?

• AAbsorbing carbon dioxide
• BAbsorbing oxygen
• CEncouraging the organisms to respire
• DBalancing the pH in the test tube

How can measurements taken from this equipment be used to calculate the rate of respiration?

• ABy dividing the number of organisms by the distance the colored liquid moves
• BBy dividing the time by the distance the colored liquid moves
• CBy dividing the distance the colored liquid moves by the number of organisms
• DBy dividing the distance the colored liquid moves by the time

In this experiment, why will the colored liquid move?

• AThe organisms will give out carbon dioxide, pushing the liquid further away from them.
• BThe organisms will take in oxygen, drawing the liquid closer to them.
• CThe organisms will take in carbon dioxide, drawing the liquid closer to them.
• DThe organisms will give out oxygen, pushing the liquid further away from them.

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