Question

put the letter of the correct answer on the blank.
c (1) only class of cells in sponges; differentiate into other cells specialized for specific functions (a) amoebocytes
e (2) pores in the outer cell layer; formed by tube - shaped pore cells (b) collar cells
(3) fibers in the middle cell layer; make up the skeleton of sponge (c) epithelial cells
(4) specialized cells; form the inner layer of a sponge; line central cavity; trap and digest food particles (d) excurrent pore
(5) single, large pore at the top of a sponge; where water exits (e) incurrent pores
(6) specialized cells; disperse nutrients and oxygen to and collect waste from other cells of a sponge (f) spicules
fill in each blank, or draw a line under the correct answer.
(7) the sponge does not have tissues, organs, or body systems, but it has some types of specialized (muscle, bone, cardiac, epithelial) cells that perform necessary body functions.
(8) a sponge needs an efficient ____________ because it relies on the flow of water through the body to draw in food, oxygen, and other materials needed to sustain life.
(9) the most ____________ sponges are harvested as bath sponges.
(10) in sexual reproduction in a sponge, two reproductive cells called (zygotes, gametes, pore cells, spicules) unite to produce a new offspring.
(11) a single - celled organism called a/an (zygote, gamete, amoebocyte, polyp) is produced when a sperm fertilizes an ovum in a sponge.
(12) sponges are ____________, which means they are able to produce both male and female gametes.
(13) since sponges do not possess reproductive organs, __________ can transform into sperm, and __________ can transform into ova.
(14) in the central cavity of one sponge, a collar cell that has changed into an ovum captures the sperm released from another sponge, and the ovum is ____________.
(15) ____________ reproduction of a sponge does not involve separate male and female gametes.
(16) __________ and __________ are two methods of asexual reproduction used by sponges.
(17) if a sponge is broken up or cut into pieces, each piece will regenerate into a new sponge as long as the piece contains sufficient amoebocytes and (spongin, spicules, collar cells, pore cells).

othing causes us to so nearly resemble god as the forgiveness of injuries.\ chrysostom
score this page. correct mistakes. rescore.

Explanation:

(3)

Las espículas (spicules) son fibras en la capa media de células de la esponja que forman su esqueleto. Entonces, la opción correcta es (F) spicules.

Las células collar (collar cells) son células especializadas que forman la capa interna de la esponja, recubren la cavidad central y atrapan y digieren partículas de alimento. Entonces, la opción correcta es (B) collar cells.

El poro excurrente (excurrent pore) es el poro grande y único en la parte superior de la esponja por donde sale el agua. Entonces, la opción correcta es (D) excurrent pore.

Answer:

(F) spicules

(4)