What type of body symmetry is exhibited by protozoans?

Which of the following organisms possesses a shell around its body?

Chrysophytes,euglenoids,dinoflagellates,and slime molds are included in the kingdom ............ .

Select the incorrect statement for Chrysophytes:

$A$: Holophytic protistans are important phytoplanktons and they contribute $80\%$ of the total photosynthesis.
$R$: They lack chemosynthetic nutrition and utilize non-sulphur organic compounds as the source of electron and proton in carbon assimilation.

Contractile vacuole is generally absent in the