13. Most of the absorption of nutrients occurs in the a. proventriculus. b. vent
ID: 206750 • Letter: 1
Question
13. Most of the absorption of nutrients occurs in the
a. proventriculus.
b. ventriculus.
c. hindgut.
d. gastric caecae.
e. None of the above
14. The ancestral condition of insect mouthparts is the possession of
a. mandibles.
b. non-stylate haustellate mouthparts.
c. stylate haustellate mouthparts.
d. a combination of all three mouthpart types.
e. None of the above
15. Within insects, a modified form of the integument lines portions of
a. the tracheal system, ducts of the dermal glands, and ducts of the genital system.
b. the midgut, the tracheal system, and ducts of the dermal glands.
c. the foregut, the hindgut, and the tracheal system.
d. Two of the above
e. None of the above
16. Members of the Pseudoscorpiones
a. lack venom and spinnerets.
b. produce venom and lack spinnerets.
c. produce both venom and silk.
d. are variable with respect to poison and silk glands.
e. None of the above
Explanation / Answer
Answer:
13). a. a. proventriculus.
Explanation:
The proventriculus is a triturating (grinding into fine particles) organ in some insects, and in most it provides a valve controlling the entry of food into the midgut, which is the main site of digestion and absorption of nutrients.
14). a. mandibles.
15).
a. the tracheal system, ducts of the dermal glands, and ducts of the genital system.
c. the foregut, the hindgut, and the tracheal system.
Explanation:
A modified forms of cuticle line parts of the alimentary canal, tracheae and ducts of the reproductive system.
16). a. lack venom and spinnerets.
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