Go through the following statements carefully
Compared to many other organisms, bacteria as a group show the most ex- tensive metabolic diversity.
Mycoplasma die in the absce of oxy- gen
Cyanobacteria often form blooms in polluted water bodies.
No pathogenic mycoplasma have been reported so far
Which of these are correct?

Options

A. (i), (ii) and (iii)
B. (i), (iii)
C. (ii), (iii) and (iv)
D. (iii) & (iv)

Answer

To determine which statements about bacteria and related organisms are correct, let's analyze each statement step by step.

### Step 1: Analyze the first statement
**Statement:** Compared to many other organisms, bacteria as a group show the most extensive metabolic diversity.

**Analysis:** This statement is true. Bacteria exhibit a wide range of metabolic pathways, including autotrophic (photosynthetic and chemosynthetic) and heterotrophic (saprophytic and parasitic) modes of nutrition. This metabolic diversity allows them to thrive in various environments.

### Step 2: Analyze the second statement
**Statement:** Mycoplasma die in the absence of oxygen.

**Analysis:** This statement is false. Mycoplasma are a type of bacteria that can survive without oxygen; they are known as anaerobic organisms. Therefore, they do not die in the absence of oxygen.

### Step 3: Analyze the third statement
**Statement:** Cyanobacteria often form blooms in polluted water bodies.

**Analysis:** This statement is true. Cyanobacteria, also known as blue-green algae, can proliferate rapidly in nutrient-rich (polluted) waters, leading to blooms that can deplete oxygen and produce toxins.

### Step 4: Analyze the fourth statement
**Statement:** No pathogenic mycoplasma have been reported so far.

**Analysis:** This statement is false. Some mycoplasma species are indeed pathogenic and can cause diseases in plants and animals. Therefore, this statement is incorrect.

### Conclusion
Based on the analysis:
- The first statement is **true**.
- The second statement is **false**.
- The third statement is **true**.
- The fourth statement is **false**.

Thus, the correct statements are the first and third.

### Final Answer
The correct statements are:
1. Compared to many other organisms, bacteria as a group show the most extensive metabolic diversity. (True)
2. Cyanobacteria often form blooms in polluted water bodies. (True)