The blood sugar 'Trehalose' is entirely lacking in insect:

Correct option is C

Trehalose is the main blood sugar (hemolymph sugar) in most insects. It is a disaccharide composed of two glucose molecules and serves as a source of energy for flight, metabolism, and stress resistance (e.g., desiccation, freezing).
Trehalose plays critical roles in:
· Energy supply during flight and activity
· Osmoregulation and protection of proteins and membranes under stress
· Maintaining blood sugar homeostasis in hemolymph
Explanation for Each Option
(a) Chalcophora mariana ❌
· A species of metallic wood-boring beetle (family: Buprestidae).
· Like most beetles, it contains trehalose as the primary sugar in its hemolymph.
(b) Bombyx mori ❌
· The mulberry silkworm, widely studied and domesticated.
· It contains trehalose abundantly, especially in the larval and pupal stages for energy during cocoon formation.
(c) Anisolabis littorea ✅
· A species of earwig found in coastal areas.
· Studies have shown a complete lack of trehalose in its hemolymph, making it unique among insects.
· It may rely on alternative sugars or metabolic pathways for energy.
(d) Agria affinis ❌
· A species of fly (Diptera), known to possess trehalose like most members of this order.
· Trehalose supports high energy demands, especially during flight.