While comparing invertebrate groups, a sea star can replace a damaged arm, and some species may regrow much of the body if part of the central disc remains. The feature being tested is:
Correct Answer: B. regeneration
Practice Library
All MCQs
Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
A diagram in the course handout shows that a stalked or feather-armed echinoderm filters food from water currents. Identify the related structure or process.
Correct Answer: D. sea lilies and feather stars
For semester exam preparation, consider this situation: an elongated soft-bodied echinoderm lies on the sea floor and has reduced ossicles. The correct conclusion is:
Correct Answer: C. sea cucumbers
A lab observation notes that a round spiny echinoderm lacks arms and has a compact test. The observation points to:
Correct Answer: D. sea urchins and sand dollars
In a specimen-based viva, the examiner describes this case: a specimen has slender flexible arms sharply set off from the central disc. Choose the concept that fits it best.
Correct Answer: D. brittle stars
A student is revising Animal Diversity-I: a specimen has thick arms that merge gradually with a central disc and uses tube feet for movement. What should the student write in the answer sheet?
Correct Answer: B. sea stars
During a Zoology practical, a sea urchin test is made of hard internal plates beneath the skin. Select the most accurate identification.
Correct Answer: C. endoskeleton of calcareous ossicles
A zoology teacher links echinoderms with chordates based on early embryonic development. The best answer is:
Correct Answer: A. deuterostome affinity
A learner makes a note: a sea star larva swims with right and left sides before developing into a radial adult. The missing scientific idea is:
Correct Answer: C. bilateral larvae
In museum study, an adult sea star has body parts arranged around five radiating arms. The specimen or feature is best linked with:
Correct Answer: C. pentaradial adult symmetry
While comparing invertebrate groups, water enters the sea star water vascular system through a sieve-like plate on the aboral surface. The feature being tested is:
Correct Answer: C. madreporite
A diagram in the course handout shows that a sea star opens a bivalve shell by attaching many small hydraulic projections to it. Identify the related structure or process.
Correct Answer: B. tube feet