Aerobic respiration

This equation represents a chemical reaction taking place inside living organisms. $\text{glucose} + \text{oxygen} \rightarrow \text{carbon dioxide} + \text{water}$ Which characteristic of living organisms is linked to this equation?

Feb/March 2016

The diagram illustrates how sewage is treated. Why is air bubbled through the aeration tank?

Feb/March 2016

An experiment is arranged to examine the uptake of oxygen by germinating seeds. What change occurs in the levels of the coloured water at X and Y?

Feb/March 2018

A practical is arranged to investigate oxygen uptake by germinating seeds. How do the levels of the coloured water at X and Y change?

Feb/March 2018

The graph illustrates the lactic acid concentration in blood during and after exercise. Which process explains the shape of the graph at Z?

Feb/March 2019

The apparatus illustrated was used to study aerobic respiration in seeds. It was kept in a dark room. Every environmental condition was maintained constant. What will happen in the apparatus?

Feb/March 2023

The apparatus illustrated was used to study aerobic respiration in seeds. The apparatus was kept in a dark room. All environmental conditions were held constant. What will occur in the apparatus?

Feb/March 2023

What substances are produced by aerobic respiration?

Feb/March 2024

The graph illustrates the variation in an athlete’s breathing rate. What is responsible for the response during time period Y?

Feb/March 2024

Inside which cell structure does aerobic respiration take place?

Feb/March 2024

Which gas is required for aerobic respiration?

Feb/March 2025

Yeast is able to respire aerobically and anaerobically. For each molecule of glucose that yeast uses, how many additional molecules of carbon dioxide gas are released by aerobic respiration than by anaerobic respiration?

Feb/March 2025

What word equation represents aerobic respiration in plants?

May/June 2016

When aerobic respiration occurs, glucose is broken down. What is produced in this process?

May/June 2016

State the word equation for aerobic respiration in plants.

May/June 2016

Which part of the cell uses oxygen to release energy from nutrient molecules?

May/June 2016

What is the equation of aerobic respiration?

May/June 2016

Which of the following statements about aerobic respiration are correct?

May/June 2017

Four test-tubes are arranged as shown. After one hour, which test-tube has the highest carbon dioxide concentration?

May/June 2017

In what part of the cell does aerobic respiration take place?

May/June 2018

Aerobic respiration is the process in which glucose is broken down. $\text{C}_6\text{H}_{12}\text{O}_6 + x\text{O}_2 \rightarrow y\text{H}_2\text{O} + z\text{CO}_2 + \text{energy}$ What values of $x$, $y$ and $z$ make the equation balanced?

May/June 2018

In what part of the cell does aerobic respiration take place?

May/June 2018

A student carried out an investigation into aerobic respiration. Soda lime takes in carbon dioxide. If the woodlice are carrying out aerobic respiration, what will happen to the liquid drop?

May/June 2018

Aerobic respiration takes place in which cell part?

May/June 2018

Respiration liberates energy. State the word equation for aerobic respiration.

May/June 2018

For aerobic respiration, State the balanced chemical equation.

May/June 2018

Fig. 5.1 depicts an adult fly, Chrysomya megacephala.

May/June 2018

State the fully balanced chemical equation for aerobic respiration.

May/June 2018

The potted plants are kept for a week in a tank of water, as illustrated. Why do the plants die?

May/June 2019

The diagram presents two experiments that examine gas exchange in small aerobic crustaceans. Soda lime takes in carbon dioxide. In which direction does the liquid marker move?

May/June 2019

The diagram illustrates how sewage is treated. Why is air bubbled through the aeration tank?

May/June 2019

Potted plants are kept for a week in a tank of water, as shown. Why do the plants die?

May/June 2019

Decomposers have a key role in the carbon cycle. They give out carbon dioxide. Which process causes this?

May/June 2019

Oxygen is needed for aerobic respiration. How many molecules of oxygen are needed for the aerobic respiration of three molecules of glucose?

May/June 2019

The diagram illustrates how sewage is treated. Why is air bubbled through the aeration tank?

May/June 2019

The amount of oxygen absorbed by the germinating seeds was recorded. The graph displays the findings. What is the rate of oxygen uptake?

May/June 2019

In cells with a high respiration rate, what would be present in larger numbers in the cytoplasm?

May/June 2019

A student examined how quickly oxygen is taken up while woodlice carry out aerobic respiration. Woodlice are arthropods.

May/June 2019

What equation represents aerobic respiration?

May/June 2021

Once the athlete has done strenuous exercise, they keep breathing deeply for a recovery period. It is during this recovery period that the oxygen debt is removed. Which reaction removes the oxygen debt?

May/June 2021

The substances taking part in aerobic respiration are shown below. 1 carbon dioxide 2 glucose 3 oxygen 4 water Which of these substances are consumed in aerobic respiration?

May/June 2022

The diagram illustrates oxygen uptake by germinating seeds at two different temperatures. At what time is the oxygen uptake at $20\,^\circ\text{C}$ four times as great as that at $10\,^\circ\text{C}$?

May/June 2022

A student used this apparatus to investigate the rate of aerobic respiration in woodlice. Which statement describes and explains the way the coloured liquid moves as the woodlice are respiring?

May/June 2022

Which substances are involved in aerobic respiration?

May/June 2022

During germination, seeds carry out aerobic respiration to release energy for growth. The balanced equation for aerobic respiration in seeds may be shown as follows. $Q + R \rightarrow S + T$ Which row shows the balanced equation for aerobic respiration in seeds?

May/June 2022

When exercise is intense, lactic acid accumulates in muscles, resulting in an oxygen debt. Which statement describes a stage in the removal of the oxygen debt during recovery?

May/June 2022

Aerobic respiration produces carbon dioxide. How many molecules of carbon dioxide are formed from the aerobic respiration of three molecules of glucose?

May/June 2022

What is the word equation that represents aerobic respiration?

May/June 2023

Which row concerning aerobic respiration is correct?

May/June 2023

Which row indicates aerobic respiration?

May/June 2023

Fig. 5.1 shows a cell diagram of one form of respiration, with arrows indicating how the substances involved in this type of respiration move in and out of the cell.

May/June 2023

Which word equation shows aerobic respiration?

May/June 2024

Which products are formed during aerobic respiration in plants?

May/June 2024

Strenuous exercise can lead to an oxygen debt. Which process is used to repay the oxygen debt?

May/June 2024

Two molecules of glucose are respired aerobically. How many molecules of water are formed?

May/June 2024

The graph illustrates the concentration of lactic acid in the blood both during exercise and while recovering after exercise. Blood lactic acid concentration / $\text{mg dm}^{-3}$ plotted against time / minutes. Which process is responsible for the shape of the graph at Z?

May/June 2024

Following a race, athletes incur oxygen debt. The diagram illustrates how this oxygen debt is removed. What occurs at X?

May/June 2025

The equations show chemical reactions that occur in living organisms. Which reaction gives out the largest amount of energy?

Oct/Nov 2016

Which statement about aerobic respiration in muscles is correct?

Oct/Nov 2016

To demonstrate that a green plant can take in oxygen, under which condition should it be kept, and why?

Oct/Nov 2016

Once a race has ended, athletes have oxygen debt. The diagram illustrates how the oxygen debt is repaid. What occurs at X?

Oct/Nov 2016

Which equation represents aerobic respiration in plants?

Oct/Nov 2016

State the names of the structures labelled J, K, L and M. Record your answers on Fig. 5.1.

Oct/Nov 2016

Which process gives out water and energy?

Oct/Nov 2017

The graph illustrates how the concentration of lactic acid in the blood changes during exercise and afterwards. The ongoing action of which process explains the pattern of the graph at Z?

Oct/Nov 2017

Intense exercise can lead to an oxygen debt. Which process removes this oxygen debt?

Oct/Nov 2017

Glucose is needed for respiration. Which other molecule is needed for aerobic respiration?

Oct/Nov 2018

Glucose is needed for respiration. What other molecule is needed for aerobic respiration?

Oct/Nov 2018

A student carried out several kinds of activity. During each one, she recorded her pulse rate in beats per minute (bpm). The data are shown in Fig. 3.1.

Oct/Nov 2018

Which process liberates the greatest amount of energy from one molecule of glucose?

Oct/Nov 2019

Which process releases the greatest amount of energy from a single molecule of glucose?

Oct/Nov 2019

Which process releases the greatest amount of energy from a single molecule of glucose?

Oct/Nov 2019

Consumers obtain carbon atoms from the food they eat. By what route do carbon atoms exit the consumers?

Oct/Nov 2019

Which equation correctly represents aerobic respiration?

Oct/Nov 2019

Lactic acid accumulates in the muscles during vigorous exercise. During recovery, by what process is this lactic acid removed?

Oct/Nov 2019

What effect does raising the temperature from $10^{\circ}\text{C}$ to $20^{\circ}\text{C}$ have on germinating seeds?

Oct/Nov 2019

Which chemicals are required for aerobic respiration to release energy?

Oct/Nov 2021

Which process causes carbon dioxide to be released into the atmosphere?

Oct/Nov 2021

The table lists some facts about aerobic respiration. Which row is the correct one?

Oct/Nov 2021

Which process gives off carbon dioxide into the atmosphere?

Oct/Nov 2021

For the balanced chemical equation of aerobic respiration, what products are formed?

Oct/Nov 2021

Respiration is a process carried out by every living organism.

Oct/Nov 2021

The diagram shows a cell with clusters of bacteria along its outer edge. The bacteria have moved towards regions with a high oxygen concentration. Which process in the cell causes the bacteria to gather into these clusters?

Oct/Nov 2023

Which balanced equation correctly represents one form of respiration?

Oct/Nov 2023

Which substances are consumed and which are made during aerobic respiration in a plant cell?

Oct/Nov 2024

What chemical equation represents aerobic respiration?

Oct/Nov 2024

In the balanced chemical equation for aerobic respiration, how many molecules of carbon dioxide, glucose, oxygen and water are shown?

Oct/Nov 2024

The following symbol equation shows aerobic respiration: $\text{C}_6\text{H}_x\text{O}_y + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O}$. Which numbers correspond to the letters shown in the equation as $x$, $y$ and $z$?

Oct/Nov 2024

Which row identifies the substances that are used in aerobic respiration and the substances that are produced?

Oct/Nov 2025