"Fire algae" belongs to which group?

Animals of class $Ciliata$ (Ciliates):

Which of the following is an incorrect pair?

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'.

Which of the following is an incorrect pair?

The scientist who coined the term 'Protista' to include both plant-like and animal-like unicellular organisms was