Question

Comment upon any five of the following spots

Answer 1

Explanation:

Hydra

Hydra is a solitary, fresh-water organism that has its place in the taxonomy as

Phylum   -----  Coelentrata  

Class      -----  Hydrozoa  

Order      ----   Hydroidea  

Genus     ----   Hydra.

Structure

It is a polypoid, tubular and cylindrical coelenterate measuring growing to a maximum of 1 cm.

The proximal end called basal disc contains the gland cells.  

The distal end has the mouth called hypostome which is encircled with slender tentacles.

Feeding - It feeds on insect larvae and crustaceans.  

Jelly

Jelly commonly known as jelly fish has the taxonomy as follows

Phylum    ---- Coelentrata

Class       ---- Scyphozoa

Order      ---- Semaeostomeae

Genus     ---- Aurelia (Jelly fish)

Structure: It has a transparent circular body with a mouth on the concave surface.

Feeding: Carnivorous as it feeds on small aquatic animals.

Earthworm:

Earth worm has the following taxonomy

Phylum     ---- Annelida

Class        ---- Oligochaeta

Order       ---- Neooligochaeta

Genus      ---- Pheretima

Structure: It has a long narrow segmented body.

Feeding: It feeds on organic matter such as dead leaves, fruits. It also eats small microorganisms.