The organism belonging to this group causes the disease amoebiasis.

What is the ecological and economic importance of the following organisms?
$(i)$ Diatoms
$(ii)$ Mycorrhiza

Give scientific reasons: Euglena is also called a plant-animal.

Which of the following groups of kingdom $Protista$ is being described in the statements given below?
$(i)$ This group includes diatoms and golden algae.
$(ii)$ They are microscopic and float passively in water currents (plankton).
$(iii)$ Most of them are photosynthetic.
$(iv)$ They have deposits in their habitat; this accumulation over billions of years is referred to as 'diatomaceous earth'.

The rejuvenescent spore of a diatom is:

In Whittaker's five kingdom classification,unicellular eukaryotes that are primarily aquatic and possess various cell organelles constitute which kingdom?