Which of the following is responsible for the 'Red tide' phenomenon?

Which of the following is true for $Trypanosoma$?

When a freshwater protozoan possessing a contractile vacuole is placed in a glass containing seawater,the vacuole will:

The cyst wall of $Euglena$ is formed of:

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

What is the ecological importance of slime moulds?