________has proved to be an antidote against lepidopteran peats on crop plants:

Options

A. Meloidegyne incognitia
B. Rhizobium meliloti
C. Bacillius thuringensis
D. Agrobacterium tumefaciens

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:** The question asks for a substance that acts as an antidote against lepidopteran pests on crop plants. Lepidopteran pests include insects such as moths and butterflies, which can be harmful to crops.

2. **Identifying the Options:** The options provided are:
- A) Melidogyne incongnita
- B) Rhizobium meliloti
- C) Bacillus thuringiensis
- D) Agrobacterium tumefaciens

3. **Analyzing the Options:**
- **Melidogyne incongnita:** This is a root-knot nematode, not specifically an antidote for lepidopteran pests.
- **Rhizobium meliloti:** This is a bacterium that forms symbiotic relationships with legumes and is not known for controlling lepidopteran pests.
- **Bacillus thuringiensis (Bt):** This is a gram-positive bacterium that is widely used as a biological pesticide. It produces proteins that are toxic to certain insects, particularly lepidopterans.
- **Agrobacterium tumefaciens:** This bacterium is known for its role in plant genetic engineering and does not serve as an antidote for lepidopteran pests.

4. **Selecting the Correct Answer:** Based on the analysis, **Bacillus thuringiensis (Bt)** is the correct answer as it is specifically known for its effectiveness against lepidopteran pests.

5. **Final Answer:** The correct answer is **Bacillus thuringiensis**.

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