Regarding photosynthesis, Jan Ingenhousz established the essentially of sunlight and green colour respectively by using :-

Options

A. Bell jar setup
B. An aquatic plant and radioisotopic technique
C. Cladophora algae and purple sulphur bacteria
D. Bell jar setup and green sulphur bacteria

Answer

To solve the question regarding Jan Ingenhousz's contributions to the understanding of photosynthesis, we can follow these steps:

### Step 1: Understand the Question
The question asks about the methods used by Jan Ingenhousz to establish the necessity of sunlight and the green color in photosynthesis.

### Step 2: Recall Jan Ingenhousz's Experiments
Jan Ingenhousz is known for his experiments that demonstrated the role of sunlight in photosynthesis. He conducted experiments using plants and light to show that plants produce oxygen in the presence of sunlight.

### Step 3: Identify the Key Components
- **Sunlight**: Ingenhousz showed that light is essential for photosynthesis.
- **Green Color**: He also demonstrated that only the green parts of the plant (leaves) are capable of photosynthesis.

### Step 4: Analyze the Options
1. **Bale jar setup**: This refers to Ingenhousz's experiment where he used a glass jar to observe the effects of light on plants.
2. **Aquatic plant and radioisotropic technique**: This does not directly relate to Ingenhousz's work.
3. **Cladophora algae and purple sulfur bacteria**: This is unrelated to Ingenhousz's findings.
4. **Bale jar setup and green sulfur bacteria**: While the bale jar setup is relevant, green sulfur bacteria are not part of Ingenhousz's experiments.

### Step 5: Determine the Correct Answer
Based on the analysis, the correct answer is **A: Bale jar setup**. This setup was crucial in demonstrating the necessity of sunlight for photosynthesis.

### Step 6: Conclusion
Jan Ingenhousz established the essentiality of sunlight and the green color in photosynthesis primarily through his experiments using the bale jar setup.

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