Flavr Savr' variety of tomato which remains fresh for a longer period than normal tomato variety

Options

A. has high amount of enzyme polygalacturonase
B. has reduced amount of enzyme polygalacturo-nase
C. is a pest resistant variety
D. is rich in vitamin A and prevent night blindness

Explanation

### Step-by-Step Solution:

1. **Understanding Flavr Savr Tomato**: The Flavr Savr tomato is a genetically modified organism (GMO) specifically designed to have a longer shelf life compared to normal tomato varieties.

2. **Genetic Modification**: The genetic modification involves the introduction of an artificial gene into the tomato's DNA. This gene alters the tomato's natural processes.

3. **Role of Polygalacturonase**: The key to the Flavr Savr tomato's extended freshness lies in the enzyme polygalacturonase. This enzyme is responsible for the breakdown of pectin in the cell walls of the tomato, which leads to softening and spoilage.

4. **Reduction of Polygalacturonase**: The Flavr Savr tomato has been engineered to reduce the production of polygalacturonase. With lower levels of this enzyme, the breakdown of pectin is slowed down, allowing the tomato to maintain its firmness and freshness for a longer period.

5. **Conclusion**: Therefore, the Flavr Savr tomato remains fresh longer than normal tomatoes because it has a reduced amount of the enzyme polygalacturonase, which is responsible for the ripening and spoilage of tomatoes.

### Final Answer:
The Flavr Savr tomato remains fresh for a longer period than normal tomatoes due to the reduced production of the enzyme polygalacturonase.