The factor which is not limiting in normal conditions for photosynthesis is

Options

A. water
B. chlorophyll b
C. light
D. carbon dioxide.

Answer

To solve the question regarding which factor is not limiting in normal conditions for photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Photosynthesis**:
- Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose, using carbon dioxide and water, and releasing oxygen as a byproduct.

2. **Identify the Factors Affecting Photosynthesis**:
- The main factors that can affect the rate of photosynthesis include:
- Water availability
- Light intensity
- Carbon dioxide concentration
- Chlorophyll content

3. **Analyze Each Option**:
- **Option A: Water** - Water is essential for photosynthesis. A lack of water can limit the process.
- **Option B: Chlorophyll** - Chlorophyll is necessary for capturing light energy. A deficiency in chlorophyll can limit photosynthesis.
- **Option C: Light** - Light intensity is crucial for photosynthesis. Insufficient light can limit the rate of photosynthesis.
- **Option D: Carbon Dioxide** - While carbon dioxide is required for photosynthesis, under normal conditions, it is often present in sufficient quantities in the atmosphere and does not limit the process.

4. **Determine the Non-Limiting Factor**:
- Since the question asks for the factor that is not limiting under normal conditions, we can conclude that carbon dioxide (Option D) is typically abundant and does not restrict the rate of photosynthesis.

5. **Final Answer**:
- The factor which is not limiting in normal conditions for photosynthesis is **Option D: Carbon Dioxide**.