Introduction
The question asks about processes that require oxygen. The correct answer is option 'D', meaning that all listed processes—combustion, respiration, and oxidation—need oxygen to occur. Let's explore each of these processes in detail.
Combustion
- Combustion is a chemical reaction that occurs when a substance reacts with oxygen, producing heat and light.
- Common examples include burning wood, gasoline, or natural gas.
- Oxygen is essential for combustion because it serves as the oxidizing agent that facilitates the reaction.
Respiration
- Respiration is a biological process in which organisms convert glucose and oxygen into energy.
- This process occurs in the cells of living organisms, including humans and animals.
- Oxygen is vital for the production of ATP (adenosine triphosphate), which provides energy for various cellular activities.
Oxidation
- Oxidation refers to a chemical process where a substance loses electrons, often involving the addition of oxygen.
- It is not limited to combustion and can occur in many chemical reactions, such as rusting.
- Oxygen acts as a key reactant in these processes, making it essential for oxidation reactions.
Conclusion
- All three processes—combustion, respiration, and oxidation—illustrate the critical role of oxygen in various chemical and biological activities.
- Understanding these processes highlights the importance of oxygen in our environment and daily life.
In summary, the correct answer is 'D' because oxygen is integral to combustion, respiration, and oxidation.