In the genome of a protozoan,the genetic material is organized as:

An $X$ reproduces in such great numbers that the water may appear red,producing red tides and killing large marine animals like $Z$. $X$ belongs to $Y$. Identify $X$,$Y$,and $Z$.

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

Which of the following statements are correct about slime moulds?
$(i)$ Its thalloid body,Plasmodium,has pseudopodia for locomotion and engulfing organic matter.
$(ii)$ During unfavourable conditions,Plasmodium differentiates and produces fruiting bodies,sporangia.
$(iii)$ Spores possess no true cell wall.
$(iv)$ They are dispersed by air currents.
$(v)$ Being extremely resistant,spores survive for many years.
$(vi)$ Plasmodium can grow up to several feet.
Choose the correct answer from the following options:

The contractile vacuole is absent in $......$.

Sea water glows during the night mainly due to the occurrence of: