What is the nature of cell-walls in diatoms?
The cell walls of diatoms contain silica and are indestructible. The cell wall is made up of two thin overlapping walls which fit together such as a soap box. When the diatoms die, the silica in their cell walls gets deposited in the form of diatomaceous earth.
How are viroids different from viruses?
Find out what do the terms ‘algal bloom’ and ‘red-tides’ signify.
State two economically important uses of:
(a) Heterotrophic bacteria
(b) Archaebacteria
Discuss how classification systems have undergone several changes over a period of time?
