The differentiation of a head region in Molluscans and Annelids that includes a brain like concentration of ganglia and longitudinal nerve trunks
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Both groups exhibit a concentration of nervous tissue, which includes ganglia and nerve trunks. Show more…
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In annelids, coordinated waves of contraction occur even in headless worms because headless worms cannot move the coelom acts as a skeleton annelids do not have a brain stretch reflexes can coordinate adjacent segments annelids have a nerve net the ganglion in the first segment after the brain takes over the coordination of movement
Sri K.
Madhur L.
19. The nervous system in the head region of a flatworm is shown. What in their environment do rheoreceptors detect? A. food availability. C. the rate of silt deposition. B. the presence of enemies. D. the flow rate of stream water. 20. Certain parasitic trematodes cause deformities in frogs. The metacercariae cyst stage of the trematode life cycle causes deformity in frogs. The metacercariae infect the tadpole in its A. mouthparts, so it cannot feed well. C. intestines, causing it to starve. B. developing legs. D. brain, thereby causing neurological death. 21. The class Gastropoda of the phylum Mollusca features A. torsion during development C. many plates on top. B. filter-feeding. D. a foot that develops into tentacles. 22. Shown is a gastropod larva, including its foot. Cephalopod larvae also have a similar foot. In cephalopod larvae the foot becomes A. a pedestal for locomotion. C. a series of arms with suckers. B. a tongue-like structure. D. a beak for biting prey. 23. Which structure is used for feeding by Polyplacophora of the phylum Mollusca? A. The teeth B. The beak C. The radula D. The gills 24. Which group of molluscs features a closed circulatory system? A. Cephalopoda B. Polyplacophora C. Bivalvia D. Gastropoda 25. Worms of the phylum Nemertea feature a unique structure known as the Rynchocoel. Which of the lettered structures is the Rhychocoel?
Adi S.
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