$A$ well-defined nucleus is absent in

The locomotory organs of $Echinodermata$ are:

$(i)$ To which division of Plantae do algae belong? Write one characteristic of the division. Give two examples.
$(ii)$ Name the group:
$(a)$ Which includes unicellular eukaryotic organisms.
$(b)$ In which the mode of nutrition is saprophytic.
$(c)$ In which seeds are not enclosed in fruit.
$(iii)$ Classify flowering plants on the basis of the number of cotyledons present in the seed.

$(i)$ Draw a neat diagram of Hydra.
$(ii)$ Label mesoglea and gastrovascular cavity.
$(iii)$ Name the group of animals it belongs to.
$(iv)$ Name one species of this group that lives in colonies.

$5-$Kingdom classification was proposed by:

State whether the following statement is true or false:
Cryptogamae means those with open reproductive organs.