How does $Amoeba$ react to light intensity?

The protistan genome is characterized by:

The given statements are some characters of a particular group of Kingdom $Protista$.
$(i)$ Most of them are freshwater organisms found in standing water.
$(ii)$ They have a protein-rich layer (called pellicle) which makes their body flexible.
$(iii)$ They have two flagella,a short and a long one.
$(iv)$ Though they are photosynthetic in the presence of sunlight,but in the absence of sunlight they behave like heterotrophs by predating on other smaller organisms.
Identify the correct group on the basis of these characters.

Which of the following are included in the Kingdom $Protista$?

Nutrition in $Amoeba$ is

Which of the following are known as 'flagellated algae'?