For semester exam preparation, consider this situation: during development of a snail, the visceral mass rotates so the mantle cavity shifts toward the anterior region. The correct conclusion is:
Correct Answer: C. torsion
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A lab observation notes that gills, anus, and excretory openings of many molluscs open into a space under the mantle. The observation points to:
Correct Answer: A. mantle cavity
In a specimen-based viva, the examiner describes this case: a dissected mollusc shows the digestive, reproductive, and excretory organs concentrated in one body region. Choose the concept that fits it best.
Correct Answer: B. visceral mass
A student is revising Animal Diversity-I: a gastropod slowly crawls over a wet surface using a broad ventral structure. What should the student write in the answer sheet?
Correct Answer: C. muscular foot
During a Zoology practical, a grazing snail scrapes algae from a rock using a ribbon-like toothed organ. Select the most accurate identification.
Correct Answer: B. radula
A snail secretes a shell from a fold of tissue covering the visceral mass. The best answer is:
Correct Answer: D. mantle
A learner makes a note: older zoology texts group rotifers, nematodes, and related forms together because of a shared body cavity type. The missing scientific idea is:
Correct Answer: C. pseudocoelomates with complete gut
In museum study, a marine meiofaunal animal shows a spiny, ringed trunk under high magnification. The specimen or feature is best linked with:
Correct Answer: A. segmented trunk with spines
While comparing invertebrate groups, a minute marine worm has a retractable head bearing spiny structures used in movement through sediment. The feature being tested is:
Correct Answer: D. scalids on an introvert
A diagram in the course handout shows that a rotifer has a body cavity derived from blastocoel and not fully lined by mesoderm. Identify the related structure or process.
Correct Answer: C. pseudocoelom
For semester exam preparation, consider this situation: a rotifer population increases rapidly when females produce eggs without fertilization. The correct conclusion is:
Correct Answer: B. parthenogenesis
A lab observation notes that a rotifer grinds food using a muscular pharynx containing hard jaws. The observation points to:
Correct Answer: C. mastax with trophi