Question

A transparent bivalved siliceous shell (silica deposited in the cellulosic cell wall) known as frustule is present in:
A. Dinoflagellates
B. Diatoms
C. Euglenoids
D. Both (2) and (3)

Answer 1

Hint: Diatoms have a translucent siliceous shell (silica deposited in the cell wall) that protects their bodies. The frustule is made up of two valves called the epitheca and hypotheca. The two valves interlock like a soap box.

Complete step-by-step answer

Diatoms are a form of algae and one of the most frequent phytoplankton species. Two thecae that constitute the diatom fit together like a petri dish in a diatomic cell. These are the epitheca and hypotheca motifs. Each theca contains two valve faces, evolve and hypovalve, and the valve mantle. The overlapping region is the cingulum, and it is bordered by girdle bands. The central vacuole is a huge vacuole found mostly in plants that store water and regulates cell turgor pressure. It is in charge of pushing the cell's contents towards the cell membrane and allowing the cell to absorb more light energy for photosynthesis. Although vacuoles may be found in mammals, protists, fungi, and other bacterial cells, the central vacuole can only be found in plant cells. Within the food chain, diatoms are producers. Diatom cells are distinguished because they are surrounded by a silica (hydrated silicon dioxide) cell wall known as a frustule. These frustules vary in shape but are virtually always bilaterally symmetrical.

As a result, the right answer is Option B 'Diatoms.'


Note: Within the food chain, diatoms are producers. Diatom cells are distinguished by the fact that they are surrounded by a silica (hydrated silicon dioxide) cell wall known as a frustule. The morphology of these frustules varies greatly, but they are virtually always bilaterally symmetrical, hence the group name.