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Insect Morphology and Systematics
Resistance to desiccationInsect Morphology and Systematics5.
Resistance to desiccation:
Insects minimise the water loss from their body surface through
the following processes.
I
.
Prevention of water loss:
i.
Lipids and polyphenols present in the
Epicuticle
acts as water proofing.
ii.
Was layer
with closely packed wax molecules prevents escape of water.
iii.
Spiracles
are closed to prevent water loss.
iv.
In the egg stage
shell development
prevents water loss and desication of inner embryos.
II.
Conservation of water
i.
Capable of utilizing
metabolic water
ii.
Rectal resorption
of water from faeces.
iii.
Terrestrial insects use less quantity of water to remove the nitrogenous waste (
Uric acid
)
which is water insoluble.
6.
Tracheal system of respiration:
This ensures direct transfer of adequate oxygen to actively
breathing tissues. Spiracles through their closing mechanism admit air and restrict water loss.
Insect Morphology and Systematics
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