Coose incorrect w.r.t. photosynthesis

Options

A. it is a physico-chemical process
B. Oxygen is evolved as a by- product in all photoautotrophs
C. Occurs in unicellular and muiticellular photoaututrophs
D. Anabolic and reductive process

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is the process by which plants, known as autotrophs, synthesize their own food using light energy. This occurs primarily in the chloroplasts of plant cells.

2. **Role of Chlorophyll**: The pigment chlorophyll, located in the chloroplasts, is crucial for absorbing light energy. This light energy is then converted into chemical energy.

3. **Photosynthesis Reaction**: The general equation for photosynthesis can be summarized as:
\[ 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2 \]
In this reaction, carbon dioxide and water are converted into glucose (C6H12O6) and oxygen (O2) is released as a by-product.

4. **Identifying Incorrect Statements**: The question asks to identify the incorrect statement regarding photosynthesis. The statement that "oxygen is not a by-product" is incorrect. Oxygen is indeed a by-product of the photosynthesis process.

5. **Evaluating Other Statements**:
- The statement that photosynthesis occurs in both unicellular and multicellular photoautotrophs is correct.
- The statement that photosynthesis is an anabolic and reductive process is also correct. Anabolic processes involve building larger molecules from smaller ones, and reduction involves the gain of electrons (or hydrogen).

6. **Conclusion**: The incorrect statement regarding photosynthesis is that oxygen is not a by-product; it is, in fact, a by-product of the process.