Phylum Echinodermata: Class Asteroidea
Strands of tissue, which run circularly around mouth beside ring canal, extends aborally into arms, is termed as:
circular muscles
hemal system
ringed structure
symmetry
hemal system
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A series of Ossicles that runs length of oral surface of arm is called:A. pedicellariae
B. disk
C. arms
D. ambulacral groove
Class Asteroidea have approximately
A. 1200 members
B. 1600 members
C. 1500 members
D. 1800 members
Each arm of sea star consist of:
A. 2 gonads
B. 2 testes
C. 2 openings
D. radial canals
Process in which sea stars regenerate their lost body part is called:
A. mitosis
B. reproduction
C. regeneration
D. formation
Thin folds of body wall that helps in gas exchange and extends in Ossicles are called:
A. pedicellariae
B. dermal branchiae
C. disk
D. arms
Some species of echinoderms i.e. sea star has pincher like structure are called:
A. pedicellariae
B. dermal branchiae
C. arms
D. disk
Bilaterally symmetrical larva in class Asteroidea is named as:
A. bipinnaria larva
B. Muller’s larva
C. planula
D. tadpole
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