Classify the following animals based on the number of chambers in their heart: Rohu,Scoliodon,Frog,Salamander,Flying lizard,King Cobra,Crocodile,Ostrich,Pigeon,Bat,Whale.

$X, Y$ and $Z$ are living organisms.
$(a)$ Identify the group to which they belong on the basis of following features:
$(i)$ $X -$ Microscopic,unicellular,prokaryotic.
$(ii)$ $Y -$ Microscopic,unicellular,eukaryotic and shows locomotion with the help of pseudopodia/flagella.
$(iii)$ $Z -$ Multicellular,filamentous,eukaryotic,autotrophic and aquatic.
$(b)$ Which amongst the above is most advanced?
$(c)$ Name one organism each belonging to the groups of $X, Y$ and $Z$.

Classify the following organisms based on the presence of a true coelom: $Spongilla$,$Planaria$,$Scorpion$,$Birds$,$Ascaris$,$Nereis$.

Mention any one characteristic feature of saprophytes.

The branch of biology which deals with the principles and practice of classification of plants and animals is

$A$ plant specimen was found without differentiated roots.
$(a)$ Which plant structure helps in attaching this plant to the substratum?
$(b)$ To which group would you classify this plant?
$(c)$ Which plant could it be?