Respiration Practice Questions

Yeast cells can respire anaerobically.

Which row of the table shows the products of anaerobic respiration in yeast?

	ethanol	lactic acid	carbon dioxide
A	yes	no	yes
B	yes	yes	no
C	no	yes	yes
D	no	yes	no

Complete the word equation for aerobic respiration.

glucose + .......................... $\rightarrow$ .......................... + water

State two uses of the energy released by respiration in the cells of the bee.

State what is meant by an exothermic reaction.

Give one piece of evidence from the human body that shows respiration is exothermic.

Complete the table to compare aerobic respiration with anaerobic respiration in muscle cells.

	Aerobic respiration	Anaerobic respiration in muscle cells
Is oxygen needed?	yes	(i) ..........................
Product(s) formed from glucose	(ii) ..........................	lactic acid
Relative amount of energy released	(iii) ..........................	small amount

Write the balanced symbol equation for aerobic respiration.

Name the substance produced by anaerobic respiration in muscle cells.

Write the word equation for anaerobic respiration in muscle cells.

The player's oxygen consumption stays higher than normal for several minutes after the match has finished.

Explain why.

Explain why soda lime is placed in the tube.

The drop of coloured liquid moved 45 mm towards the tube in 5 minutes.

The cross-sectional area of the capillary tube is $1.5\ \text{mm}^2$. The mass of the woodlice is $2.5\ \text{g}$.

Calculate the rate of oxygen consumption of the woodlice in $\text{mm}^3$ per minute per gram.

.............................................. $\text{mm}^3$ per minute per gram

Give one safety precaution the student should take when handling the soda lime.

Calculate the rate of bubble production at $40\ ^\circ\text{C}$ in bubbles per minute.

.............................................. bubbles per minute

Explain why the rate of bubble production increased between $20\ ^\circ\text{C}$ and $40\ ^\circ\text{C}$.

Explain why very few bubbles were produced at $60\ ^\circ\text{C}$.

Give two variables the students should control so that their results can be compared fairly.

Describe two things the students should do so that the woodlice are not harmed during the investigation.

Explain why the respirometer should be placed in a water bath at a constant temperature.

Calculate the percentage increase in oxygen consumption between resting and cycling at medium speed.

.............................................. %

Explain the trend shown in the table.

Compare the types of respiration used by the muscle cells of the two athletes.

In your answer you should refer to the reactants, the products and the amount of energy released.

Calculate the rate of oxygen consumption of the maggots in $\text{mm}^3$ per gram per hour.

.............................................. $\text{mm}^3$ per gram per hour

The technician repeated the measurement using woodlice and calculated a rate of $40\ \text{mm}^3$ per gram per hour.

Explain why the rates were calculated per gram rather than as the total volume of oxygen used.

The technician also set up a second, identical respirometer containing glass beads instead of organisms.

Explain how this second respirometer improves the investigation.