$Entamoeba \ histolytica$ excretes through:

When a fresh-water protozoan possessing a contractile vacuole is placed in a glass containing marine water,the vacuole will

The red eye spot containing haematochrome is meant for:

Which structure is associated with both locomotion and the ingestion of food?

$Ceratium$ is

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'.