Biology Questions and Answers
Poriferans
- What are poriferans?
The phylum Porifera contains the
simplest creatukingdom. Sponges are res of the animalaquatic sessile (^)
beings (they are not able to move by
themselves aattached to substrates),nd they keep themselves they do not
have tissue dhave pores (feature aiversity and their bodiesfter which their
name comes).
They are multicellular,the animal kingdom. like all beings of
- What is the way of life of
sponges?
Sponges live exclusively in an aquatic
environment and they are attachetheir base to a substrate (fixation d by
ground). Sponges are filtering animals,
they nourish tthat enter their atriumhemselves f brought in withrom nutrients
water.
- What is the typical shape of
poriferans?
Sponges have bodies in the form of
tubular vases oupper extremity. Thr globes open in theey have an internal (^)
central cavity and porous walls. The
central cavity is called spthe opening in the upper extremity isongocoel and
called osculum.
- How does water move
inside sponges? What is the
function of the pores in these
animals?
Sponges are filteriwater enter their bodies by their lateralng beings. They make
pores. Water thcentral cavity and exits throen circulatesugh the inside the
osculum. - How do sponges try to
protect themselves against
harm from the environment?
Is that method efficient or
rudimentary?
Sponges can the entrance close their pores to avoiof water into their bodiesd (^)
in the presence of stimulus that may
mean danger. This mrudimentary but it is actually aethod however is
protection attempt against nocent
agents.
- What are the main cells of
which poriferans are made?
Sponges have their outer wall covby flat cells called pinacocytes andered
having pores well-delimited by special
cells called is filled with cporocytes.hoanocytes, fla The internal wallgellate cells (^)
specialized in phagocytosis of food
brought to choanocyte flathe central cavity;gella also maintains th the (^) e
water flux inside the sponge.
Between the outer and the inner
coverage of the poriferan body there are
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