Question

Identify the wrong statement from the following:

• A. Transgenic Potato shows resistance to phytophthora.
• B. Bt. Cotton shows resistance to viruses.
• C. Transgenic Papaya shows resistance to Ring Spot Virus.
• D. Transgenic Tomato shows resistance to it{Pseudomonas}.

Hint:

Genetically modified (GM) crops are designed for specific resistance. Always verify the exact pathogen targeted in the modification process.

Answer 1

The Correct Option is B

The incorrect statement is (B) Bt. Cotton shows resistance to viruses. 
Explanation:
Bt Cotton: Bt cotton is genetically modified to produce a toxin from the bacterium Bacillus thuringiensis. This toxin is specifically effective against certain insects, particularly lepidopteran pests (like bollworms), not viruses.
The other statements are correct:
Transgenic Potato: Late blight disease in potatoes is caused by the oomycete Phytophthora infestans. Transgenic potatoes have been developed with resistance genes to combat this disease.
Transgenic Papaya: Papaya ringspot virus is a major threat to papaya cultivation. Genetically modified papaya varieties have been successful in resisting this virus.
Transgenic Tomato: Bacterial wilt caused by Pseudomonas solanacearum can be devastating to tomato crops. Transgenic approaches have been used to introduce resistance against this bacterium.

Answer 2

To solve the problem, we need to identify the wrong statement regarding transgenic plants and their resistance to various pathogens.

1. Understanding the Transgenic Plants:
Transgenic plants are genetically modified to express resistance to various diseases or pests. For instance:
Bt Cotton is engineered to resist insect pests (specifically, the bollworm), not viruses.
Transgenic Potato can be resistant to Phytophthora, a fungus that causes late blight.
Transgenic Papaya has been engineered to resist the ring spot virus.
Transgenic Tomato can be resistant to Pseudomonas, a bacterial pathogen.

2. Analyzing the Options:
(1) Bt Cotton shows resistance to virus: This is incorrect. Bt Cotton is resistant to pests, specifically the bollworm, due to the introduction of a gene from the bacterium Bacillus thuringiensis. It is not resistant to viruses.
(2) Transgenic Potato shows resistance to Phytophthora: This is correct. Transgenic potatoes have been engineered to resist Phytophthora infestans, which causes late blight.
(3) Transgenic Papaya shows resistance to ring sport virus: This is correct. Transgenic papayas have been developed to resist the ring spot virus.
(4) Transgenic Tomato shows resistance to Pseudomonas: This is correct. Transgenic tomatoes have been modified for resistance to the bacterial pathogen Pseudomonas.

3. Identifying the Incorrect Statement:
Option (B) is the wrong statement, as Bt Cotton is resistant to insect pests, not viruses.

Final Answer:
The correct answer is Option B: Bt Cotton shows resistance to virus.