Who demonstrated that green plansts purifty the foul air produced by breathing animals and burning candles?

Options

A. Priestley
B. Ingenhousz
C. Sachs
D. Engelmann

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the scientist who demonstrated that green plants purify the foul air produced by breathing animals and burning candles.

2. **Identifying the Options**: The options given are:
- A) Priestley
- B) Ingenhousz
- C) Seck
- D) Engelmann

3. **Analyzing Each Option**:
- **Option A: Priestley**: Joseph Priestley conducted an experiment known as the "Bell Jar Experiment." In this experiment, he placed a burning candle, a mouse, and a mint plant in a sealed jar. He observed that the plant was able to purify the air, allowing the mouse to survive and the candle to continue burning.
- **Option B: Ingenhousz**: Jan Ingenhousz worked with aquatic plants and discovered that they produce oxygen in the presence of sunlight, but he did not specifically demonstrate the purification of air in the context mentioned in the question.
- **Option C: Seck**: Julius von Sachs focused on the production of glucose in green plants and did not conduct experiments related to air purification.
- **Option D: Engelmann**: T.W. Engelmann studied the action spectrum of photosynthesis using Cladophora and aerobic bacteria, but he did not demonstrate air purification in the context of animals and candles.

4. **Conclusion**: Based on the analysis, Joseph Priestley is the scientist who demonstrated that green plants purify the foul air produced by breathing animals and burning candles.

5. **Final Answer**: The correct answer is **A) Priestley**.

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