Some protists possess structures for the regulation of their water content. They are:

Which of the following is an incorrect pair?

Diatomaceous earth is used to insulate boilers and steam pipes because-

Which one is the correct pairing?

The organism shown in the figure is .........

Which of the following are the characters of dinoflagellates?
$(i)$ They are planktonic golden yellow algae with soap box like structure.
$(ii)$ They are marine biflagellated protista.
$(iii)$ They appear yellow,green,brown,blue and red in colour.
$(iv)$ The cell wall has stiff cellulose plates on the outer surface.
$(v)$ They are saprophytic (or) parasitic unicellular forms.