The transgenic tobacco plant is resistant to nematode meloidegyne due to presence of

Options

A. Sense RNA and Antisense DNAs
B. Both Sense and Antisense DNAs
C. Both sense and Antisense RNAs
D. Both sense and Antisense DNAs

Answer

To solve the question regarding the transgenic tobacco plant's resistance to the nematode Meloidogyne, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Problem**: The question asks about the mechanism of resistance in transgenic tobacco plants against the nematode Meloidogyne.

2. **Identify the Nematode's Action**: Meloidogyne nematodes infect the roots of tobacco plants, leading to decreased yield due to the production of a harmful protein.

3. **Explore the Mechanism of Resistance**: Scientists employed a technique known as RNA interference (RNAi) to combat the effects of the nematode's RNA. This technique involves silencing the RNA that is responsible for the harmful effects.

4. **Constructing Complementary RNA**: To achieve RNA interference, scientists constructed a gene that was complementary to the RNA produced by the nematode. This complementary RNA would bind to the nematode's RNA.

5. **Insertion into the Tobacco Plant**: The complementary gene was inserted into the tobacco plant, allowing the plant to produce both sense RNA (the original RNA) and antisense RNA (the complementary RNA).

6. **Formation of Double-Stranded RNA**: The sense and antisense RNAs paired up to form double-stranded RNA. This structure is crucial because it prevents the translation of the RNA into proteins.

7. **Prevention of Protein Formation**: Since only single-stranded RNA can be translated into proteins, the formation of double-stranded RNA effectively silences the nematode's RNA, preventing the production of the harmful protein.

8. **Conclusion**: The transgenic tobacco plant is resistant to the nematode Meloidogyne due to the presence of both sense and antisense RNA, which leads to the formation of double-stranded RNA and prevents the harmful effects of the nematode.

### Final Answer:
The transgenic tobacco plant is resistant to nematode Meloidogyne due to the presence of **both sense and antisense RNA**.