Diatom frustule/ shell is made of_____________?
Correct answer: A. Silica
- A. Silica
- B. Calcium carbonate
- C. Manesium carbonate
- D. Both B. and C.
Explanation
A diatom frustule is a rigid shell made mainly of hydrated silica, forming the two overlapping halves of the cell wall. Students may choose calcium carbonate because it forms shells in many aquatic organisms, but diatom shells are siliceous rather than calcareous.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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