Amount of oxygen evolved per quantum of light is called as

Options

A. Quantum value
B. Quantum requirements
C. Quantum yield
D. Emerson effect

Answer

The question asks for the term that describes the amount of oxygen evolved per quantum of light during photosynthesis. Let's break down the solution step by step:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- The question mentions "amount of oxygen evolved per quantum of light." Here, "quantum" refers to a unit of light energy, often associated with photons.

2. **Photosynthesis Process**:
- During photosynthesis, plants convert light energy into chemical energy, and one of the byproducts of this process is oxygen (O2).

3. **Defining Quantum Yield**:
- Quantum yield is defined as the amount of product (in this case, oxygen) produced per unit of light energy absorbed (quantum of light).

4. **Calculating Quantum Yield**:
- It is known that during photosynthesis, it takes approximately 8 quanta of light to produce one molecule of oxygen. Therefore, the quantum yield can be calculated as:
\[ \text{Quantum Yield} = \frac{1 \text{ molecule of } O2}{8 \text{ quanta of light}} = \frac{1}{8} \]

5. **Identifying the Correct Answer**:
- The question specifically asks for the term that describes the amount of oxygen evolved per quantum of light. Based on our understanding, this term is "quantum yield."

6. **Eliminating Other Options**:
- The other terms mentioned (quantum requirement, quantum value, immersion effect) do not accurately describe the relationship between oxygen production and light energy in the context of the question.

### Final Answer:
The amount of oxygen evolved per quantum of light is called **Quantum Yield**.

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