Which of the following are motile zooids in cnidarians?
A. Polyps
B. Medusae
C. Both of these
D. None of these
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Biology
In sponges fertilization takes place in
A. Ectoderm
B. Mesenchyme
C. Endoderm
D. Uterus
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80% of the food of sponges consists of
A. Detrital organic particles
B. Zooplankton and small animals
C. Phytoplanktons
D. all of these
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The single main opening of the sponge cavity is
A. Osculum
B. Ostia
C. Spongocoel
D. None of these
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Sperms released in water are carried to the mesenchyme in sponges by
A. Amoeboid cell
B. Stipules
C. Spicules
D. Spines
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The skeleton of sponges is made up of
A. Calcium
B. Silica
C. Both of these
D. None of these
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The sponges in which sperms develop first are included in the category of
A. Peritandrous
B. Pertandrous
C. Protendrous
D. Protandrous
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A sponge of Antarctica which is more than a meter tall is
A. Scolymastra joubini
B. Euplectella
C. Spongilla
D. Leucoselenia
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The function of coelom is
A. To increase the size of the animals
B. To help in the functioning of reproductive system
C. To provide space for the development of organs and systems
D. None of these
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In most triploblasts after embryonic development the three layers are represented as
A. Separate layers of cells
B. Structures formed from them
C. Structures associated with them
D. Their functions in body
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