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

Read the following statements and answer the question given below:
$(i)$ They are saprophytic protists.
$(ii)$ Under suitable conditions,they form an aggregation (called plasmodium) which may grow and spread over several feet.
$(iii)$ During unfavourable conditions,the plasmodium differentiates and forms fruiting bodies bearing spores at their tips.
Which of the following class of protists is being described by the above statements?

Write a short note on Slime Moulds.

The flagellum of $Astasia$ or $Euglena$ is:

Which of the following animals belongs to the phylum Protozoa?

"Golden algae" is the common name for algae that belong to ............ .