10. Write the function of the following
structures
a, choanocytes b. radula
c. cnidoblast
d. ctenidia Plz help
Answers
Answer:
a) The primary function of choanocytes is to assist with circulation. The flagellum on each choanocyte whips back and forth, which creates water movement. This water current helps circulate seawater within and through the sponge.
b) It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the oesophagus.
c) In coelenterates, specialised cells called cnidoblasts are present, which contain stinging cell organelles called nematocysts. Nematocysts help to paralyse or hold the prey by injecting poison present within it.
d) A ctenidium is shaped like a comb or a feather, with a central part from which many filaments or plate-like structures protrude, lined up in a row. It hangs into the mantle cavity and increases the area available for gas exchange.
Explanation:
Hope it helps, if yes, Mark the answer as the brainliest.