Justify giving one reason: crocodiles have a four-chambered heart,but are still classified as reptiles.

Write appropriate terms for the following:
$(i)$ Animals that are able to maintain a constant body temperature over a wide range of environmental temperatures.
$(ii)$ Animals which have a pseudocoelom.
$(iii)$ Plants which bear naked seeds.

$A$ 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.

Classify organisms of kingdom $Protista$ on the following basis and give an example of each:
$(a)$ Based on structure for locomotion.
$(b)$ Based on mode of nutrition.

Fill in the blanks:
$(a)$ Fungi shows .............. mode of nutrition.
$(b)$ Cell wall of fungi is made up of ..............
$(c)$ Association between blue-green algae and fungi is called as ..............
$(d)$ Chemical nature of chitin is ..............
$(e)$ .............. has the smallest number of organisms with the maximum number of similar characters.
$(f)$ Plants without well-differentiated stem,root,and leaf are kept in ..............
$(g)$ .............. are called as amphibians of the plant kingdom.

On the basis of the following features,identify the group and give one example of each:
$(i)$ Presence of notochord at some stage of life.
$(ii)$ Unicellular,microscopic,and eukaryotic.
$(iii)$ Seeds are enclosed in fruits.