Comment upon any five of the following spots
1.museum specimen of
HYDRA or jelly or earthworm
Answers
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.
I'll be discussing about earthworm.
Phylum: Annelida
Class: Oligochaeta
Order: Neooligochaeta
Genus: Pheretima
Earthworm: An earthworm is a tube-shaped, segmented worm. It lies in phylum Annelida. They are mostly found on soil. They feed on living and dead organic material of the soil which helps them to sustain their lives. It has its own digestion system which runs through all over its body from the tip of the earthworm to the tail of the earthworm.