Cell: The Unit of LifeEasy
Question
Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct ?
Options
A.Penguin is homoiothermic while the remaining three are poikilothermic
B.Leech is a fresh water from while all others are marine
C.Spongilla has special collered cell called choancytes in the remaining three
D.All are bilaterally symmetrical
Solution
Spongilla belongs to phylum-Porifera, in which choanoytes are the characteristic cells, these are absent in leech, dolphin and pengiun. These distinctive cells line the interior body walls of sponges. These cells have a central flagellumthat is surrounded by a collars of micovilli. Choanocytes are versatile cells. Their flagella beat to create the active pumping of water through the spogne, while the collars of choanocytes are the primary areas where nutrients are absorbrd into the sponge.
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