Bacteria with a tuft of flagella at one end are called-
**Core Concept**
The question tests the understanding of bacterial morphology, specifically the arrangement of **flagella** in different types of bacteria. Bacterial flagella are crucial for **motility**, allowing bacteria to move towards favorable environments. The arrangement of flagella can be used to classify bacteria into different categories.
**Why the Correct Answer is Right**
Bacteria with a tuft of flagella at one end are indeed classified based on their flagellar arrangement. This specific arrangement is known as **lophotrichous**, where "lopho-" means tuft and "-trichous" refers to hair or flagella. This unique arrangement aids in the identification and classification of bacteria.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the lophotrichous arrangement.
**Option B:** Similarly, this option does not match the description provided.
**Option C:** This is also incorrect as it does not correspond to the lophotrichous type.
**Clinical Pearl / High-Yield Fact**
Remembering the different flagellar arrangements (**monotrichous**, **lophotrichous**, **amphitrichous**, **peritrichous**) can be helpful in identifying and classifying bacteria, which is crucial in clinical microbiology for diagnosing infections.
**Correct Answer:** D. Lophotrichous bacteria