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Diatoms are the chief producers in some oceans and in some seasons as they are the primary producers and the food chain in marine ecosystem depends on it.

1. Ciliates differs from other protozoans in having two types of nuclei. E.g., Paramoecium have two types of nuclei i.e. macronucleus & micronucleus.
2. All unicellular eukaryotic organism like diatoms, desmids (chrysophytes), euglenoids, dinoflagellates and slime mould are included in Protista.
3. In chrysophytes, the cell walls form two thin overlapping shells held together. The body of Diatoms appears like soap box due to overlapping shells.
4. Chlamydomonas & Chlorella have been included in algae. Algae are chlorophyllous, thalloid avascular plants with no cellular differentiation. Algae belong to thallophyta of plant kingdom.

Correct answer: In chrysophytes, the cell walls form two thin overlapping shells held together. The body of Diatoms appears like soap box due to overlapping shells.

Solution

Diatoms are chrysophytes with a cell wall made of two overlapping silica shells, called frustules. This gives them a box-like appearance, often compared to a soap box.

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