In which of the following processes is oxygen released into the air ?

Options

A. Photosynthesis
B. Respiration
C. Transpiration
D. Excretion

Answer

To solve the question "In which of the following processes is oxygen released into the air?", we can follow these steps:

### Step 1: Identify the processes listed in the question
- Usually, options might include processes like photosynthesis, respiration, combustion, etc. For this solution, we will focus on the most relevant process, which is photosynthesis.

### Step 2: Understand the process of photosynthesis
- Photosynthesis is a biological process that occurs in green plants, algae, and some bacteria. It involves the conversion of light energy (usually from the sun) into chemical energy in the form of glucose.

### Step 3: Determine the by-products of photosynthesis
- During photosynthesis, carbon dioxide (CO2) and water (H2O) are used as raw materials. The process produces glucose (C6H12O6) and releases oxygen (O2) as a by-product.

### Step 4: Conclude the answer
- Since oxygen is released into the air during photosynthesis, we can conclude that the correct answer to the question is photosynthesis.

### Final Answer:
- The process in which oxygen is released into the air is **photosynthesis**.

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