Transgenic tobacco plants are protected against :

Options

A. Dipterans
B. Coleopterans
C. Meloidegyne incognita
D. Lepidopterans

Answer

To solve the question regarding which organisms transgenic tobacco plants are protected against, let's break down the information step by step:

### Step 1: Understand Transgenic Plants
Transgenic plants are genetically modified organisms (GMOs) that have been altered using genetic engineering techniques. This often involves introducing a gene from another species that provides some beneficial trait, such as resistance to pests or diseases.

**Hint:** Remember that transgenic plants are modified to enhance certain traits, such as pest resistance.

### Step 2: Identify the Protection Mechanism
In the case of transgenic tobacco plants, they are protected through a mechanism known as RNA interference (RNAi). RNAi is a natural cellular defense mechanism that helps in regulating gene expression and defending against viral infections and pests.

**Hint:** Focus on the role of RNA interference in providing protection to transgenic plants.

### Step 3: Recognize the Target Organism
The question lists several options, and we need to identify which one of them is a target of the protection offered by transgenic tobacco plants. The key point mentioned is that these plants are particularly protected against a nematode that infests the roots.

**Hint:** Look for the organism that is a nematode, as that is the specific type of pest mentioned.

### Step 4: Analyze the Options
The options provided are:
A. Dipterans
B. Coleopterans
C. Meloidogyne incognita
D. Lepidopterans

Among these, **Meloidogyne incognita** is known to be a root-knot nematode that affects the roots of various plants, including tobacco.

**Hint:** Identify which option corresponds to a nematode that infests plant roots.

### Step 5: Conclusion
Based on the information gathered, transgenic tobacco plants are specifically protected against **Meloidogyne incognita** (option C), as this nematode is a known pest that can damage the roots of tobacco plants.

**Final Answer:** C. Meloidogyne incognita