Question

You find a relatively small, multicellular organism. On dissection, you see that it has flagellated cells that help move sea water through the entire body of the organism. This organism does not have a nervous system. Structural support of its body is obtained partly through small, sharp structures that interlace and partly through collagen fibers. What is it?

	A.	Cnidarian
	B.	Fungus
	C.	Fern
	D.	Alga
	E.	Poriferan

Answer 1

Option E

Porifera characteristics matching with all the specifications given above.

Moreover, Cnidaria have a Nervous system but the question asking about the organism that don't have a Nervous system.

Alga is both unicellular and multicellular but here it is given multicellular

Fern is a vascular plant where you can't find a flagella upon dissection. Fungi also don't have flagella

So the only option left is porifera that is a small multicellular organism. it does not have a nervous system. structural support of its body is obtained through sharp structures interlace through collagen fibre.