True or False pouches and culminating with skin-brooding pipefishes\'seadragons

Question

True or False pouches and culminating with skin-brooding pipefishes'seadragons (most derived strategy) a True 20. Symgnathids exhibit an evolutionary continuum of reproductive strategies beginning with the seahorses which have clesed pouches (ancestral condition) then progressing through pipefishes w open-brood b False 2 Oviparity is considered the ancestral means of reproduction in chondrichthyans, characteristics of sharks all skates, and probably all chimaeras. Retained oviparity represents an intermediate step in the process that probably led to live birth in chondrichthyans 4 Tue b. False fish providting all, or most, of the nourishment to internally-developing young. Fishes that reproduce this way inelude many sharksays and coelacanths ov viviparity is a live-bearing reproductive strategy consisting of internal fertilization with the female a Tue b. False 23. Promiscuity is assumed to be the ancestral fish mating system. a True b. False Matching 24. epithelial organ, which coatains many specialized receptor cells (neurons extending into bulb/tract innervated by cranial nerve I), within a pit connecting incurrent/excurrent nostrils on the bead of jawed fisbes; agnathans have single pit/organ; gnathostomes have paired pits/organs; specialized receptor cells make contact with dissolved chemicals, and send chemical-specific nerve signals to brain. 25. Membranous labyrinth/dorsal component with 3 semicircular canals and 1 otolith chamber Membranous labyrinth/ventral component with 2 otolith chambers; ciliated sensory cells C"hair Sensory structure with ciliated cells (each "hair" cell with one cilia; send signals to brain) ciliated sensory cells ("hair cells) in ampullae and otolith chamber send nerve signals to brain. 26. cells) in otolith chambers send nerve signals to brain 27. by water (on skin) or endolymph (within canal). 28. skin, barbels, pelvic fin rays), composed of specialized epithelia cells which make contact with dissolved chemicals and send chemical-specific nerve signals to brain. Pair-shaped sensory receptors, located in mouth/pharynx and on several external surfaces (e.g., a Balanoe b. "Distant touch" sense c. Gustation (taste) d. Hearing e. Olfaction (smell)

Explanation / Answer

20. False

In sygnathids reproductive strategies started with open brood pouches in pipe fishes progressing to close brood pouches in sea horses.

21. True

22. False

Oviparity is seen in sharks.

23. True

24. E

25. A

26. D

27. B

28. C

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.