How long can you hold your breath? With or without air? In terms of producing energy,
that is the key question. Can cellular respiration occur without air? It can, but it does have limitations. There are two types of cellular respiration (see Cellular Respiration concept): aerobic and anaerobic. One occurs in the presence of oxygen (aerobic),
and one occurs in the absence of oxygen (anaerobic). Both begin with glycolysis - the splitting of glucose. Glycolysis (see "Glycolysis" concept) is an anaerobic process - it does not need oxygen to proceed. This process produces a minimal amount of ATP. The Krebs cycle and electron transport do need oxygen to proceed, and in the presence of oxygen, these process produce much more ATP than glycolysis alone. Scientists think that
glycolysis evolved before the other stages of cellular respiration. This is because the other stages need oxygen, whereas glycolysis does not, and there was no oxygen in Earth’s atmosphere when life first evolved about 3.5 to 4 billion years ago. Cellular respiration that proceeds without oxygen is called anaerobic respiration. Then, about 2 or 3 billion years ago, oxygen was gradually added to the atmosphere by early photosynthetic bacteria (cyanobacteria). After that,
living things could use oxygen to break down glucose and make ATP. Today, most organisms make ATP with oxygen. They follow glycolysis with the Krebs cycle and electron transport to make more ATP than by glycolysis alone. Cellular respiration that proceeds in the presence of oxygen is called aerobic respiration.The Presence of Oxygen
Summary
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Use this resource to answer the questions that follow.
- Aerobic vs. Anaerobic Respiration at //www.diffen.com/difference/Aerobic_Respiration_vs_Anaerobic_Respiration.
- What is the main difference between aerobic and anaerobic respiration?
- What cells perform anaerobic respiration?
- Compare the amount of ATP released by both aerobic and anaerobic respiration.
- What are the two stages of anaerobic respiration?
Review
- Define aerobic and anaerobic respiration.
- What process is common to both aerobic and anaerobic respiration?
- Why do scientists think that glycolysis evolved before the other stages of cellular respiration?
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NCERT Solutions Class 7 Science Solutions for Exercise in Chapter 10 - Respiration in Organisms
Q2) List the similarities and differences between aerobic and anaerobic respiration.
Answer:
Solution 2:
Similarities:
The similarities between aerobic and anaerobic respiration, is that they both use glucose as the starting molecule. This is called the substrate.
In addition, both aerobic and anaerobic respiration produce ATP, however, aerobic respiration produces a lot more ATP compared to anaerobic respiration.
Food is oxidized in both cases and energy is released.
Differences:
Aerobic respiration takes place in presence of oxygen; whereas anaerobic respiration takes place in absence of oxygen.
Carbon dioxide and water are the end products of aerobic respiration, while alcohol is the end product of anaerobic respiration.
Aerobic respiration releases more energy than anaerobic respiration.
Video transcript
hello students let us discuss the question here in this question we need to list the similarities and differences between aerobic and anaerobic respiration so let us first discuss the similarities both aerobic and anaerobic respiration use glucose as a starting molecule and this is called substrate so let us write down the first one the first one is both use glucose as starting molecule called substrate let us discuss the second similarity food is oxidized in both cases and energy is released so let us write down [Music] food is oxidized [Music] in both cases and energy is released the third similarity both aerobic and anaerobic respiration produce atp so let us write down both produce atp now let us discuss differences the first difference aerobic respiration takes place in the presence of oxygen whereas anaerobic respiration takes place in the absence of oxygen so let us write down the first one aerobic respiration takes place in the presence of oxygen and here in anaerobic respiration it is absence of oxygen so let us write anaerobic respiration takes place in the absence of oxygen let us discuss the second one carbon dioxide and water are the end products of aerobic respiration whereas alcohol is the end product of anaerobic respiration so let me write down the second point carbon dioxide and water are the end products of aerobic respiration whereas in anaerobic respiration alcohol is the end product respiration let us discuss the third point aerobic respiration releases more energy than anaerobic respiration so here aerobic respiration releases more energy whereas you're [Music] in anaerobic respiration less energy is released great we have completed thank you
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