Differentiation in segmental fashion occurs in

Classify the following organisms based on the absence $/$ presence of true coelom,i.e.,acoelomate,pseudocoelomate,and coelomate:
$(a)$ Scorpion
$(b)$ Sea anemone
$(c)$ Ascaris
$(d)$ Earthworm
$(e)$ Wuchereria
$(f)$ Nereis

Hard calcium carbonate structures are used as a skeleton by

State whether the following statement is true or false:
The plants of the $Angiosperm$ group bear naked seeds.

$X, Y$ 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 $Z$.

$A$ plant specimen was found with rhizoids instead of differentiated roots.
$(a)$ Identify the group to which it belongs.
$(b)$ Write any two characteristics of this group.
$(c)$ Draw the diagram of a plant belonging to this group.