Laboratory weed/Guinea pig of plant kingdom is

Options

A. Neurospora
B. Chara
C. Aspergillus
D. Pencillium

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the organism referred to as the "laboratory weed" or "guinea pig of the plant kingdom." This term is typically used to describe a model organism that is widely used in scientific research.

2. **Analyzing the Options**: The options provided include various organisms:
- Neurospora (a fungus)
- Chara (an algae)
- Aspergillus (a fungus)
- Penicillium (a fungus)

3. **Evaluating Neurospora**: Neurospora is a fungus that is indeed used in genetic engineering due to its short life cycle and ease of growth. However, it is not referred to as the laboratory weed or guinea pig of the plant kingdom.

4. **Evaluating Chara**: Chara is an algae found in freshwater. It has a stem-like or leaf-like structure but is not commonly used in laboratory settings as a model organism.

5. **Evaluating Aspergillus**: Aspergillus, particularly Aspergillus niger, is known as the laboratory weed or guinea pig of the plant kingdom. It is commonly used in laboratories for fermentation processes and is also referred to as black mould.

6. **Evaluating Penicillium**: Penicillium is another fungus known for its role in producing penicillin antibiotics. While significant, it is not referred to as the laboratory weed.

7. **Conclusion**: Based on the evaluations, the correct answer to the question is Aspergillus, specifically Aspergillus niger, as it is widely used in laboratory research and fermentation processes.

**Final Answer**: Aspergillus (specifically Aspergillus niger) is the laboratory weed or guinea pig of the plant kingdom.

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