In molluscan outer layer of shell is called:

periostracum
mantle
ocelli
protostome
periostracum  

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Phylum Echinodermata, hemichordate and Chordata shares a characteristic i.e. presence of the:
A. deuterostome
B. protoplast
C. protostomes
D. trochophore
Sometimes deuterostomes have a kidney bean-shaped larva known as:
A. trochophore
B. dipleurula
C. tadpole
D. Muller’s larva
Study of similarities and differences in early development of an animal is called:
A. development
B. comparative embryology
C. embryology
D. endocrinology
Process of gaseous exchange, excretion, elimination of digestive waste are carried out by:
A. body mass
B. ocelli
C. mantle
D. protostome
Body of molluscan includes foot, head and:
A. body mass
B. wings
C. pseudopodia
D. flagella
Arthropods, annelids, and mollusks share a common character is presences of:
A. nucleus
B. ocelli
C. protostomes
D. stomata

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