Bacteria with tuft of flagellae at one end are called –
**Core Concept**
Bacteria with tufts of flagella at one end are a group of bacteria characterized by their unique flagellar arrangement. This group includes certain species of *Pseudomonas* and *Aeromonas*, among others. The tuft of flagella is often used for motility and is a distinctive feature of these bacteria.
**Why the Correct Answer is Right**
The tuft of flagella at one end of these bacteria is a result of the flagellar structure and arrangement. Flagella are long, whip-like structures that provide motility to bacteria. In the case of bacteria with a tuft of flagella, the flagella are arranged in a specific pattern at one end of the cell, allowing for efficient movement. This unique arrangement of flagella is a key characteristic of this group of bacteria.
**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because it does not describe the characteristic flagellar arrangement of the bacteria in question.
**Option B:**
This option is incorrect because it describes a different characteristic of bacteria, such as shape or size, which is not relevant to the question.
**Option C:**
This option is incorrect because it describes a different type of bacterial structure, such as a pili or fimbriae, which is not related to the tuft of flagella.
**Clinical Pearl / High-Yield Fact**
It's worth noting that the arrangement of flagella can be an important characteristic in the identification of certain bacterial species. This can be particularly relevant in clinical settings where accurate identification of bacteria is crucial for diagnosis and treatment.
**Correct Answer:** C. Monotrichous bacteria are not the answer here. The correct answer is actually **Monotrichous bacteria have single flagellum at one end, whereas Monopolar flagellated bacteria and Peritrichous bacteria have tufts of flagella at different ends, but the correct answer is actually the other one which is **Bipolar or Lophotrichous bacteria** which have tufts of flagella at both ends, so the correct answer is **D. Lophotrichous**