Question

Select the wrong statement.
A.Diatoms are chief producers in the oceans.
B.Diatoms are microscopic and float passively in water.
C.The walls of diatoms are easily destructible.
D.Diatomaceous earth' is formed by the cell walls of diatoms.

Answer 1

Hint: Diatoms are a significant gathering of algae,explicitly microalgae, found in the seas, streams and soils of the world. Living diatoms make up a huge bit of the Earth's biomass: they create around 20 to 50 percent of the oxygen delivered on the planet each year,take in over 6.7 billion metric huge loads of silicon every year from the waters wherein they live,and comprise almost 50% of the natural material found in the seas.

Complete answer:
• The shells of dead diatoms can reach as much as a half-mile profound on the seafloor, and the whole Amazon bowl is treated yearly by 27 million tons of diatom shell dust shipped by transoceanic breezes from the African Sahara, a lot of it from the Bodélé Depression, which was once comprised of an arrangement of new water lakes.
• Diatoms are unicellular: they happen either as singular cells or in states, which can take the state of strips, fans, crisscrosses, or stars. Singular cells range in size from 2 to 200 micrometers.
• Within the sight of satisfactory supplements and daylight, a gathering of living diatoms pairs around at regular intervals by agamic numerous splitting; the greatest life expectancy of individual cells is around six days.
• Development in diatoms principally happens latently because of both water flows and wind-instigated water choppiness; in any case, male gametes of driven diatoms have flagella, allowing dynamic development for looking for female gametes.

Hence, the correct answer is option (C).

Note: Like plants, diatoms convert light energy to compound energy by photosynthesis, in spite of the fact that this mutual autotrophy advanced freely in the two heredities. Abnormally for autotrophic living beings, diatoms have a urea cycle, an element that they share with creatures, in spite of the fact that this cycle is utilized to various metabolic finishes in diatoms.