Question

give the names of special cells present in the body of sponges (porifera) and hydra (coelenterata)​

Answer 1

Answer:

1. Special cells present in the body of sponges (Porifera)

a) The organism has specialized cells named 'Pinacocytes'.

b) Pinacocytes are thin-walled and flat cells.

c) They line the outer surface of a sponge.

d) Pinacocytes are slightly contractile.

2. special cells present in the body of hydra (Coelenterata)​

a) The organisms have specialized cells named ‘Cnidocytes’.

b) These cnidocytes give rise to specialized stinging cells called nematocysts which are the characteristic of phylum Coelenterata.

c) Cnidocytes are functional in defending and capturing prey.

d) This organelle consists of a bulb-shaped capsule containing a coiled hollow tubule structure attached to it.

Answer 2

• As we know that Porifera has pinacocytes special cells.

• These cells are slightly contractile, flat, thin-walled cells. it is a part of the epithelium.

• Pinacocytes help in phagocytosis, cell adhesion, signaling, etc.

• Coelenterata consists of Cnidocytes special cells.

• These cells play important role in capturing prey, defending, etc. it giving rise to nematocytes.