Longest plant cell is

Options

A. Flax fibers of Linum
B. Fiber of Gossypium
C. Acetabularia
D. Ramie fibers of Boehmeria

Answer

To determine the longest plant cell, we will analyze each of the provided options step by step.

### Step 1: Analyze the first option - Flax fibers of Linum
- Flax fibers, derived from the plant Linum usitatissimum, can reach lengths of 10 to 100 centimeters.
- While these fibers are long, they are not the longest plant cells.

**Hint:** Consider the maximum length of the fibers and compare them with other options.

### Step 2: Analyze the second option - Fiber of Gossypium
- Gossypium, commonly known as cotton, produces fibers that are single-cell and highly elongated.
- However, the exact length of these fibers is generally shorter than that of some other plant cells.

**Hint:** Think about the characteristics of cotton fibers and their typical lengths.

### Step 3: Analyze the third option - Acetabularia
- Acetabularia is a genus of single-celled green algae, often referred to as "wine glass algae."
- While Acetabularia is notable for being one of the largest single-celled organisms, it is not a plant cell in the traditional sense, as it is classified as an algae.

**Hint:** Remember the classification of organisms and whether they fall under the category of plants.

### Step 4: Analyze the fourth option - Rameen fibers of Boehmeria
- Rameen fibers, derived from the plant Boehmeria, can reach lengths of up to 550 millimeters.
- This makes them one of the longest plant cells known.

**Hint:** Compare the lengths of the fibers from this option with the previous options to determine which is the longest.

### Conclusion
After analyzing all the options, the longest plant cell is the **Rameen fibers of Boehmeria**, which can reach lengths of 550 millimeters.

**Final Answer:** Rameen fibers of Boehmeria are the longest plant cells.