porifera

What are the cells that line the outer surface of a sponge?

• pinacocytes

• choanocytes

• cnidocytes

• nematocytes

What are the microscopic needle like spikes which serves as a scaffolding of a sponge body?

• skeleton

• choanocytes

• spicules

• chidocytes

What part of choanocyte regularly exhibits a beating movement creating a water flow across the microvilli which can then filter nutrients from the water?

• amoebocyte

• microvilli

• spicule

• flagella

Tags

NGSS.MS-LS1-2

What cells extend to the body wall of a sponge that forms the ostia?

• pinacocyte

• porocyte

• choanocyte

• archeocyte

What is the free-swimming and immature stage in a sponge life that may undergo dramatic change in structure before attaining the adult form?

• planula

• parenchymula

• spongin

• larvae

What layer in a sponge body contains the spicules?

• pinacoderm

• choanoderm

• mesoderm

• mesohyl

A sponge was observed to have large number of ostia permitting more water to come in and directly leading to the osculum. What group type of sponge is it?

• leucon

• sycon

• ascon

What is osculum?

• an opening for excurrent flow of water

• an opening for incurrent flow of water

• an opening for both excurrent and incurrent flows of water

• an opening that serves as the mouth

What is the most complex group of sponge permitting an increase in the it’s size.

• Leucon

• Ascon

• Sycon

What is the most common asexual mode of reproduction observed in sponge?

• binary fission

• budding

• fragmentation

• hermaphroditism