space, food, time and energy requirements for development and sustaining life.
iii.
Energy Utilization maximum.
iv.
Less gravitational effect.
v.
Muscular action and tracheal respiration more effective.
vi.
Easy escape from enemies.
4. Exoskeleton: Insect body is covered with an outer
cuticle called
exoskeleton which is made
up of a cuticular protein called
Chitin . This is light in weight and gives strength, rigidity and
flexibility to the insect body.
Insect Morphology and Systematics
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9
EXOSKELETON CROSS SECTION Uses: i.Act as external armour
