What is the similarity between a trophozoite and an amoeba?

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'.

Describe the characteristic features of kingdom Protista and also describe its groups.

Which of the following are considered the primitive relatives of animals?

Euglena stores food in the form of paramylum ($\beta$ 1 $\to$ 3 glucan), which is a product of the conversion of:

Which of the following organisms is included in the kingdom $Protista$?