BIOL 2251 EXAM 2 REVIEW – Questions With
Objective Solutions
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Terms in this set (35)
What are the four classes of Hexactinellida, Calcarea, Homocleramorpha, and
sponges? What is the main Demospongiae; multicellular, heterotrophic, lack cell
characteristic used to walls and produce sperm cells
classify sponges?
What is the most diverse coast of India, Australia, Coast of Africa ad Caribbean;
marine ecoregion? What is Neotropical (South America) and Palearctic
the most diverse region for
freshwater sponges?
How many species of 8500; 150
sponges have been
described? How many
occur in freshwater?
Choanocytes: flagellated cells where food particles are
collected
What is the function of the
Amoebocytes: receive and digest foods
following cells/structures:
Pinacocytes: help with movement, cell adhesion,
choanocytes,
signaling, phagocytosis and polarity
amoebocytes, pinacocytes,
Spicules: structural support
spicules, and gemmules.
Gemmules: internal buds involved in sexual
reproduction
Asconoid: simplest; stalk-like spongocoel covered with
Briefly describe the three
a single layer of choanocytes Syconoid: folded canals
canal systems.
with choanocytes Leuconoid: most complex
, Sexually:
- sperm comes from transformed choanocytes and
oocytes can come from choanocytes or archeocytes
-sperm enters canal system where choanocytes take in
How do sponges sperm, transform carrier cells and carry sperm through
reproduce sexually? How mesohyl to oocytes
about asexually? - some of oviparous, releasing both oocytes and sperm
into water
Asexually:
- They can regenerate by budding and fragmentation
- Internal buds are called gemmules
Within what class are Demospongiae
carnivorous sponges
classified?
How many species of 197
carnivorous sponges have
been described?
What adaptations are - Tiny-hook like spicules over body
present in carnivorous - Spicule layer entangles crustaceans - Filaments grow
sponges that enable them over prey
to function as predators -Lack choanocytes and internal canals
instead of filter feeders?
How many species of 9000; about 40
Cnidarians have been
described? How many
occur in freshwater?
Anthozoa
What are the four classes of Cubozoa
cnidarians? Hydrozoa
Scyphozoa
Objective Solutions
Save
Terms in this set (35)
What are the four classes of Hexactinellida, Calcarea, Homocleramorpha, and
sponges? What is the main Demospongiae; multicellular, heterotrophic, lack cell
characteristic used to walls and produce sperm cells
classify sponges?
What is the most diverse coast of India, Australia, Coast of Africa ad Caribbean;
marine ecoregion? What is Neotropical (South America) and Palearctic
the most diverse region for
freshwater sponges?
How many species of 8500; 150
sponges have been
described? How many
occur in freshwater?
Choanocytes: flagellated cells where food particles are
collected
What is the function of the
Amoebocytes: receive and digest foods
following cells/structures:
Pinacocytes: help with movement, cell adhesion,
choanocytes,
signaling, phagocytosis and polarity
amoebocytes, pinacocytes,
Spicules: structural support
spicules, and gemmules.
Gemmules: internal buds involved in sexual
reproduction
Asconoid: simplest; stalk-like spongocoel covered with
Briefly describe the three
a single layer of choanocytes Syconoid: folded canals
canal systems.
with choanocytes Leuconoid: most complex
, Sexually:
- sperm comes from transformed choanocytes and
oocytes can come from choanocytes or archeocytes
-sperm enters canal system where choanocytes take in
How do sponges sperm, transform carrier cells and carry sperm through
reproduce sexually? How mesohyl to oocytes
about asexually? - some of oviparous, releasing both oocytes and sperm
into water
Asexually:
- They can regenerate by budding and fragmentation
- Internal buds are called gemmules
Within what class are Demospongiae
carnivorous sponges
classified?
How many species of 197
carnivorous sponges have
been described?
What adaptations are - Tiny-hook like spicules over body
present in carnivorous - Spicule layer entangles crustaceans - Filaments grow
sponges that enable them over prey
to function as predators -Lack choanocytes and internal canals
instead of filter feeders?
How many species of 9000; about 40
Cnidarians have been
described? How many
occur in freshwater?
Anthozoa
What are the four classes of Cubozoa
cnidarians? Hydrozoa
Scyphozoa
