9. If the arthropod exoskeleton is so hard and rigid, how can they move their A.
ID: 253011 • Letter: 9
Question
9. If the arthropod exoskeleton is so hard and rigid, how can they move their A. The exoskeleton of their joints is flexible. B. There is not exoskeleton in their jolnts. 0 C They temperately decalcify and unsclerotize their joints to move. D. None of the above is true. 10. Which component strengthens the cuticle of nematodes? A Calcium carbonate B. Silica C. Protein D. Chitin 11. Which of the following is true? A. Pinhole eyes can change the diameter of their pinhole. B. Pinhole eyes have a fixed focal depth C. Pinhole eyes are effective in low-light conditions D. Pinhole eyes occur in all classes of the Mollusca. 12. In which of the following habitat can you find annelids? A. Marine sediment B. Freshwater sediment C. Terrestrial sediment D. All of the above 13. Which of the following phyla has numerous human parasitic species? A. Mollusca B. Nemertea C. Arthropoda D. Nematoda 14. Which of the following phyla often displays parental care? A. Mollusca B. Nemertea C. Arthropoda D. Nematoda 15. To what does torsion refer? A. To the rotation of the foot relative to the rest of the body in Gastropoda B. To the coiling of gastropod shells C. To the type of muscular contractions that occur in the foot during gastropod movement. D. To none of the above. 16. Which of the following is the typical larva of crustaceans? A. Trochophore larva B. Nauplius larva C. Ferengi larva D. Andorian larva 17. Which of the following phyla have a ring-shaped brain surrounding the pharynx? A. Mollusca B. Annelida C. Arthropoda D. NematodaExplanation / Answer
9. the exoskeleton at the joints is flexible. This flexibility provides them with great freedom of movement
10. protein. Collagen like protein is predominately found deposited with cuticle, this protein makes extensive crosslinking leading to strengthened exoskeleton
11. pinhole eyes are effective in low light conditions
12. All of above.
Class Polychaeta: marine annelids;
Class Oligochaeta: marine, freshwater and terrestrial annelids including earthworms;
Class Hirudinea: marine, fresh water and terrestrial
13. nematode. The nematode phyla include ascaris, pinworms, hookworms etc which are parasitic
14. arthropods
15. none; Torsion is the rotation of the visceral mass, mantle, and shell 180? with respect to the head and foot of the gastropod.
16. B nauplius
17 nematode
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