Entomology

The insect head is essentially a capsule which encloses the brain and bears the usually external (ectognathous) mouthparts, the eyes and a pair of sensory antennae. The mouth part comprise basic sections as:

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The insect head is essentially a capsule which encloses the brain and bears the usually external (ectognathous) mouthparts, the eyes and a pair of sensory antennae. The mouth part comprise basic sections as:

A. An ‘upper lip’ (labrum), lower (ventral) surface of which forms the epipharynx
B. a tongue-like hypopharynx; the jaws (mandibles)
C. The paired maxillae and a ‘lower lip’ (labium).
D. All of these

The body of an insect is covered by a protective __________________ formed from chitin and protein. Depending upon its precise composition and thickness, the cuticle may be soft and flexible or hard and rigid; according to requirements, it may or may not be permeable or waterproof:

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The body of an insect is covered by a protective __________________ formed from chitin and protein. Depending upon its precise composition and thickness, the cuticle may be soft and flexible or hard and rigid; according to requirements, it may or may not be permeable or waterproof:

A. three-layered skin (cuticle) 
B. Two-layered skin (cuticle)
C. Six- layered skin (cuticle)
D. None of the above