Select the following statement that does not apply to diatoms-

Options

A. Diatom cell wal may be impregnated with silicon
B. Cell wall is made up of 2 half-shells fit tightly together
C. Diatom is a chrysophyte
D. Diatom is multiflagellate

Answer

To solve the question, we need to identify the statement that does not apply to diatoms. Let's break down the information regarding diatoms step by step.

### Step 1: Understand what diatoms are
Diatoms are a type of algae classified under the group called chrysophytes. They are unicellular organisms known for their unique cell walls.

**Hint:** Remember that diatoms belong to the group chrysophytes.

### Step 2: Analyze the structure of diatom cell walls
Diatoms have cell walls that are not made of cellulose; instead, their cell walls are primarily composed of silica (silicon dioxide). This is a key characteristic that distinguishes them from other algae.

**Hint:** Focus on the composition of diatom cell walls.

### Step 3: Identify the structure of diatom cell walls
The cell walls of diatoms are made up of two halves, often referred to as frustules, which fit together like a petri dish. This unique structure is important for their identification.

**Hint:** Think about how the cell walls are structured.

### Step 4: Evaluate the options given in the question
1. **Option 1:** The diatom cell wall may be impregnated with silicon. (True)
2. **Option 2:** The cell wall is made up of two half-shells tightly together. (True)
3. **Option 3:** Diatoms are chrysophytes. (True)
4. **Option 4:** Diatoms are multi-flagellated. (False)

**Hint:** Compare each statement with the known characteristics of diatoms.

### Step 5: Identify the incorrect statement
From the evaluation, we see that option 4 is the only statement that does not apply to diatoms, as diatoms are actually non-flagellated (a-flagellated).

**Conclusion:** The statement that does not apply to diatoms is **option 4: diatoms are multi-flagellated.**

### Summary of the Solution
- Diatoms are chrysophytes.
- Their cell walls are made of silica, not cellulose.
- They have two half-shells that fit together.
- They are non-flagellated.

Thus, the answer is **option 4**.