Porifera: Question Preview (ID: 3878)


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How are sponges classified?
a) Their color b) Their ostia c) Their size d) Their spicules
Which layer in a sponge contains the choanocytes?
a) Endodermis b) Epidermis c) Mesoglea d) Both endodermis and epidermis
Which is the most complex type of sponge?
a) Calcarea b) Hexactinella (Glass) c) Demospongae (Bath) d) Sclerospongae (Boring)
The majority of sponges are in this class.
a) Calcarea b) Hexactinella c) Demospongae d) Sclerospongae
Which is the rarest class of sponges?
a) Calcarea b) Hexactinella c) Demospongae d) Sclerospongae
These sponges have spicules made of silicon dioxide and forms 6 points.
a) Calcarea b) Hexactinella c) Demospongae d) Sclerospongae
How many cell layers are found in a sponge?
a) 0 b) 1 c) 2 d) 3
Water currents are formed inside a sponge by the
a) choanocytes b) cnidocytes c) myocytes d) porocytes
Sponges share this characteristic with other animals
a) cells are organized into tissues and organs b) nerve cells c) an adult develops from a fertilized egg d) digetive cavity or coelenteron
Which of the following structures are responsible for water entering a sponge?
a) flagella b) osculum c) ostia d) porocyte
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