Question

Write the definitions of the following terms. Give examples of animals to which these terms apply.

Antennae

Appendage

Jointed appendage

Arm

Asymmetrical

Bilateral symmetry

Radial symmetry

Endoskeleton

Exoskeleton

Bone

Chitin

Leg

Pentamerous

Segmented body

Tentacle

Answer 1

S.No	Name	Definition	Example
1	Antennae	Delicate Sensory structures on head for perception of environment	Cockroach, Buttefly
2	Appendage	A extension on body with a distinct appearance	Cockroach, Butterfly, all insects
3	Jointed appendage	Appendages with flexible joints to assist movements.	Cockroach, Buttefly, Prawn, crab, centipede, all arthropods
4	Arm	A extension on body with purpose of locomotion or another  adaptive functions.	Star Fish
5	Asymmetrical	Body with no equality in left and right halves.	Sponges
6	Bilateral Symmetry	Body with equal in left and right halves.	Earthworm, Cockroach, Prawn,
7	Radial Symmetry	A circular body with equal right and left halves.	Hydra, Star Fish adult
8	Endoskeleton	A supporting framework present inside the body.	Fish, Human
9	Exoskeleton	A supporting framework present outside the body.	Pila, Chiton, Cockroach
10	Bone	A hard and rigid connective tissue for attachment of muscles and supports locomotion.	Bony Fish, Human
11	Chitin	A heteropolysaccharide that provides support externally to the arthropoda body.	Cockroach, Prawn, Crab
12	Leg	An extension on the body towards lower end that helps in locomotion.	Human, crocodile
13	Pentamerous	An organism with organs five in number or multiple of it.	Star Fish
14	Segmented Body	Body is divided into repetitive compartments.	Earthworm, Leeches
15	Tentacle	An extension on head that performs sensory function t o perceive stimuli from surrounding.	Pila(Apple snail)