Study the following statements and identify the correct option given below.
I. Viruses that infect plants have single stranded RNA and viruses that infect animals have either single or double stranded RNA or double stranded DNA.
II. Bacterial viruses or bacteriophages are usually single stranded RNA viruses.

Options

A. I is true, but II is false
B. I is false, but II is true
C. I and II are true
D. I and II are false

Answer

To solve the question, we need to analyze the two statements provided and determine their accuracy regarding viruses.

### Step-by-Step Solution:

1. **Analyze Statement I**:
- The first part states that "Viruses that infect plants have single-stranded RNA."
- This is **correct**. Many plant viruses, such as Tobacco Mosaic Virus, do indeed have single-stranded RNA as their genetic material.
- The second part states, "Viruses that infect animals have either single or double stranded RNA or double stranded DNA."
- This is also **correct**. Animal viruses can have a variety of genetic materials, including single-stranded RNA (like Influenza virus), double-stranded RNA (like Rotavirus), and double-stranded DNA (like Adenovirus).

2. **Analyze Statement II**:
- This statement claims that "Bacterial viruses or bacteriophages are usually single-stranded RNA viruses."
- This is **incorrect**. Bacteriophages, which are viruses that infect bacteria, predominantly have double-stranded DNA as their genetic material, although some can have single-stranded DNA or RNA. However, the statement is misleading as it implies that they are usually single-stranded RNA viruses, which is not true.

3. **Conclusion**:
- Since Statement I is correct and Statement II is incorrect, we conclude that the correct option is the one that indicates that the first statement is true and the second statement is false.

### Final Answer:
The correct option is that Statement I is true and Statement II is false.