Aerobic respiration

In the equations below, the term shown in a box stands for energy or an energy-rich compound. Which equation gives the best representation of aerobic respiration?

May/June 2015

Which substances are formed during aerobic respiration?

May/June 2017

Which word equation represents the respiration taking place in an athlete’s muscle cells before a race begins?

May/June 2018

1000 seeds were put into moist soil, kept in the dark, at $25\,^{\circ}\text{C}$ for 4 days. On each day, the same number of germinating seeds was taken out, dried, and their components separated and weighed. Which statements are supported by the data from this investigation?

May/June 2019

What is not a characteristic of aerobic respiration?

May/June 2021

Which of the following statements is correct for aerobic respiration?

May/June 2021

Which equation shows aerobic respiration in plant cells?

May/June 2022

From the breakdown of two molecules of glucose in aerobic respiration, how many molecules of carbon dioxide are produced?

May/June 2023

Which word equation describes aerobic respiration?

May/June 2023

Table 1.1 shows three gases that are found in the atmosphere.

May/June 2023

Respiration, which releases energy from food in living organisms, can be represented by the equation below: glucose + oxygen → carbon dioxide + water A student investigated the rate at which oxygen was taken in for respiration by some small animals. The apparatus shown in Fig. 1.1 was used. The apparatus was sealed by closing the clip so that any change in the volume of gases in the test-tube and capillary tube caused the coloured liquid drop to move. The speed at which the coloured liquid drop moves is linked to the rate of oxygen uptake by the small animals. When the small animals in the test-tube respire, they take in oxygen and give out carbon dioxide.

May/June 2024

Which balanced chemical equation represents aerobic respiration?

May/June 2025

Yeast is able to respire either aerobically or anaerobically. A student carries out an investigation into the rate of aerobic respiration in yeast. The temperature is kept at $35\,^{\circ}\text{C}$ while the oxygen concentration is changed. Which graph should the student obtain from the results?

May/June 2025

Which products are formed during aerobic respiration in animals and plants?

Oct/Nov 2016

The diagram illustrates apparatus used to investigate respiration. Which alteration will be observed, and what explains it?

Oct/Nov 2016

From the breakdown of two glucose molecules in aerobic respiration, how many carbon dioxide molecules will be formed?

Oct/Nov 2018

Respiration in human muscle cells can happen both when oxygen is present and when oxygen is absent.

Oct/Nov 2019

Outline why a seed must receive a plentiful supply of oxygen.

Oct/Nov 2021

The diagram shows the equation for aerobic respiration. $\ldots\ldots 1 \ldots\ldots + \ldots\ldots 2 \ldots\ldots \rightarrow \ldots\ldots 3 \ldots\ldots + \ldots\ldots 4 \ldots\ldots$ Which words correctly fill gaps 1-4?

Oct/Nov 2023

A plant root hair cell is carrying out aerobic respiration. Name the structures inside the cell that perform aerobic respiration.

Oct/Nov 2023

The diagram illustrates the arrangement of apparatus used to investigate respiration in germinating seeds. The coloured oil drop travels through the capillary tube. What makes the coloured oil drop move?

Oct/Nov 2024

In aerobic respiration, organisms take in oxygen and release carbon dioxide. A group of students used the apparatus in Fig. 2.1 to investigate how quickly germinating seeds respired. The carbon dioxide given off by the germinating seeds was removed by the soda lime. As oxygen was consumed, the gas volume inside the apparatus decreased, so the drop of coloured liquid travelled along the capillary tube towards the seeds. The students returned the drop of coloured liquid in the capillary tube to the start of the scale (0 mm) by opening the three-way tap and using the syringe to gently force air into the apparatus. The tap was then closed. This was the starting position of the drop of coloured liquid. Its position on the scale was noted during the next four minutes. The distance moved by the drop of coloured liquid shows the respiration rate of the seeds. The students’ results are given in Table 2.1.

Oct/Nov 2024

The equation represents aerobic respiration: $X + 6O_2 \rightarrow Y + 6CO_2 + \text{energy}$. What substances do X and Y stand for?

Oct/Nov 2025