Aerobic and Anaerobic respiration - Cloze Test Worksheet ... - Free Printable
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Step-by-step solution for: Aerobic and Anaerobic respiration - Cloze Test Worksheet ...
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Step-by-step solution for: Aerobic and Anaerobic respiration - Cloze Test Worksheet ...
Here is the completed worksheet with the correct answers filled in, followed by a detailed explanation of each section.
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Completed Worksheet:
Aerobic Respiration
All living things need to have a source of chemical energy in order to live. A fuel is a substance that can be used as a source of chemical energy. Plants make food to act as their fuel, using the energy of sunlight and a process called photosynthesis. Both animals and plants then release the energy from food by using the process of respiration.
Respiration in mammals usually involves oxygen, hence the name aerobic respiration as opposed to anaerobic respiration (without oxygen).
The following equation summarises what happens during respiration.
ATP is a molecule that contains a lot of energy. It is present in every cell. When a cell requires more energy, ATP is broken down to release its energy.
Respiration occurs in organelles (structures within a cell) called mitochondria (singular ‘mitochondrion’).
Anaerobic Respiration
When muscles are required to use energy at a rate faster than oxygen can be delivered by the blood, they respire anaerobically (without oxygen). Mammals can only respire anaerobically for short periods of time as it produces lactic acid that is toxic to cells. Cramp is a common phenomena experienced when respiring anaerobically.
Anaerobic respiration can be summarised by the following equation:
Anaerobic respiration is considered ‘wasteful’ respiration because the total energy yield from each glucose molecule is only a fraction of what is released when compared to aerobic respiration.
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Explanation of the Solution:
This worksheet covers two key biological processes: aerobic respiration (with oxygen) and anaerobic respiration (without oxygen).
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- “All living things need to have a source of _chemical_ energy...”
→ All organisms require chemical energy stored in molecules (like glucose) to power life processes such as movement, growth, and repair.
- “Plants make food... using the energy of _sunlight_ and a process called _photosynthesis_.”
→ Plants are autotrophs — they create their own food via photosynthesis, which converts sunlight into chemical energy stored in glucose.
- “Both animals and plants then release the energy from food by using the process of _respiration_.”
→ Respiration is the universal process by which cells break down glucose to release usable energy (in the form of ATP), whether oxygen is involved or not.
- “Respiration in mammals usually involves _oxygen_, hence the name _aerobic_ respiration...”
→ “Aero-” means air/oxygen. Aerobic respiration is the most efficient way to extract energy from glucose and requires oxygen. The opposite is anaerobic respiration, which does *not* require oxygen.
- “ATP... is broken down to release its _energy_.”
→ ATP (adenosine triphosphate) is the “energy currency” of the cell. When a phosphate group is removed, energy is released for cellular work.
- “Respiration occurs in... mitochondria.”
→ Mitochondria are often called the “powerhouses” of the cell because they are where aerobic respiration primarily takes place.
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- “When muscles... respire _anaerobically_ (_without_ oxygen).”
→ During intense exercise, muscles may not get enough oxygen quickly enough. To keep going, they switch to anaerobic respiration, which doesn’t require oxygen but is less efficient.
- “Mammals can only respire _anaerobically_ for short periods... produces _lactic_ acid...”
→ Anaerobic respiration in mammals produces lactic acid as a byproduct. Accumulation of lactic acid causes muscle fatigue and cramps — this is why you can’t sprint forever without stopping to breathe.
- “_Anaerobic_ respiration can be summarised by the following equation:”
→ While the actual equation isn't written here, it would typically be:
> Glucose → Lactic Acid + (small amount of) ATP
→ In yeast or some bacteria, it’s: Glucose → Ethanol + Carbon Dioxide + ATP
- “Anaerobic respiration is considered ‘wasteful’... from each _glucose_ molecule...”
→ Aerobic respiration yields about 36–38 ATP per glucose molecule. Anaerobic respiration only yields 2 ATP per glucose molecule — hence, it’s “wasteful” in terms of energy efficiency.
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✔ Key Vocabulary Used:
- Chemical, sunlight, photosynthesis, respiration, oxygen, aerobic, anaerobically, without, energy, lactic, anaerobic, glucose
These terms were selected from the word bank provided at the top of the worksheet.
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Let me know if you’d like the chemical equations or diagrams to go along with this!
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Completed Worksheet:
Aerobic Respiration
All living things need to have a source of chemical energy in order to live. A fuel is a substance that can be used as a source of chemical energy. Plants make food to act as their fuel, using the energy of sunlight and a process called photosynthesis. Both animals and plants then release the energy from food by using the process of respiration.
Respiration in mammals usually involves oxygen, hence the name aerobic respiration as opposed to anaerobic respiration (without oxygen).
The following equation summarises what happens during respiration.
ATP is a molecule that contains a lot of energy. It is present in every cell. When a cell requires more energy, ATP is broken down to release its energy.
Respiration occurs in organelles (structures within a cell) called mitochondria (singular ‘mitochondrion’).
Anaerobic Respiration
When muscles are required to use energy at a rate faster than oxygen can be delivered by the blood, they respire anaerobically (without oxygen). Mammals can only respire anaerobically for short periods of time as it produces lactic acid that is toxic to cells. Cramp is a common phenomena experienced when respiring anaerobically.
Anaerobic respiration can be summarised by the following equation:
Anaerobic respiration is considered ‘wasteful’ respiration because the total energy yield from each glucose molecule is only a fraction of what is released when compared to aerobic respiration.
---
Explanation of the Solution:
This worksheet covers two key biological processes: aerobic respiration (with oxygen) and anaerobic respiration (without oxygen).
---
Part 1: Aerobic Respiration
- “All living things need to have a source of _chemical_ energy...”
→ All organisms require chemical energy stored in molecules (like glucose) to power life processes such as movement, growth, and repair.
- “Plants make food... using the energy of _sunlight_ and a process called _photosynthesis_.”
→ Plants are autotrophs — they create their own food via photosynthesis, which converts sunlight into chemical energy stored in glucose.
- “Both animals and plants then release the energy from food by using the process of _respiration_.”
→ Respiration is the universal process by which cells break down glucose to release usable energy (in the form of ATP), whether oxygen is involved or not.
- “Respiration in mammals usually involves _oxygen_, hence the name _aerobic_ respiration...”
→ “Aero-” means air/oxygen. Aerobic respiration is the most efficient way to extract energy from glucose and requires oxygen. The opposite is anaerobic respiration, which does *not* require oxygen.
- “ATP... is broken down to release its _energy_.”
→ ATP (adenosine triphosphate) is the “energy currency” of the cell. When a phosphate group is removed, energy is released for cellular work.
- “Respiration occurs in... mitochondria.”
→ Mitochondria are often called the “powerhouses” of the cell because they are where aerobic respiration primarily takes place.
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Part 2: Anaerobic Respiration
- “When muscles... respire _anaerobically_ (_without_ oxygen).”
→ During intense exercise, muscles may not get enough oxygen quickly enough. To keep going, they switch to anaerobic respiration, which doesn’t require oxygen but is less efficient.
- “Mammals can only respire _anaerobically_ for short periods... produces _lactic_ acid...”
→ Anaerobic respiration in mammals produces lactic acid as a byproduct. Accumulation of lactic acid causes muscle fatigue and cramps — this is why you can’t sprint forever without stopping to breathe.
- “_Anaerobic_ respiration can be summarised by the following equation:”
→ While the actual equation isn't written here, it would typically be:
> Glucose → Lactic Acid + (small amount of) ATP
→ In yeast or some bacteria, it’s: Glucose → Ethanol + Carbon Dioxide + ATP
- “Anaerobic respiration is considered ‘wasteful’... from each _glucose_ molecule...”
→ Aerobic respiration yields about 36–38 ATP per glucose molecule. Anaerobic respiration only yields 2 ATP per glucose molecule — hence, it’s “wasteful” in terms of energy efficiency.
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✔ Key Vocabulary Used:
- Chemical, sunlight, photosynthesis, respiration, oxygen, aerobic, anaerobically, without, energy, lactic, anaerobic, glucose
These terms were selected from the word bank provided at the top of the worksheet.
---
Let me know if you’d like the chemical equations or diagrams to go along with this!
Parent Tip: Review the logic above to help your child master the concept of aerobic respiration worksheet.
