Complete the sentence. Presence of …..... in the soil helps in polishing, filtration of oils and syrups.

Options

A. cellulosic plates on surface of dinoflagellates .
B. cell wall of chrysophytes
C. Cell body of desmids
D. extremely resistant spores of slime moulds

Answer

To complete the sentence "Presence of …..... in the soil helps in polishing, filtration of oils and syrups," we need to identify the correct option from the given choices.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks us to fill in the blank with a substance found in soil that aids in polishing and filtering oils and syrups.

2. **Analyzing the Options**:
- **Option A**: Cellulosic plate surface of dinoflagellates - Dinoflagellates are primarily marine and are not typically associated with soil.
- **Option B**: Cell wall of chrysophytes - Chrysophytes, including diatoms, have unique cell walls that are known for their filtering properties.
- **Option C**: Cell body of diatoms - While diatoms are part of chrysophytes, the term "cell body" is not specific enough to indicate the filtering capability.
- **Option D**: Extremely resistant pores of slime walls - Slime walls do not typically relate to the polishing and filtration processes mentioned.

3. **Identifying the Correct Answer**:
- The cell wall of chrysophytes (specifically diatoms) is made of silica and is known for its indestructibility and gritty texture, which makes it effective for polishing and filtration. Therefore, the correct answer is **B: cell wall of chrysophytes**.

4. **Final Sentence Completion**: The completed sentence reads: "Presence of cell wall of chrysophytes in the soil helps in polishing, filtration of oils and syrups."