Question

The food of Hydra consists of
A) Water fleas
B) Daphnia
C) Cyclops
D) All of the above

Answer 1

Hint:They eat worms, insect larvae, tiny shellfish, larval fish, etc.They stun, entangle or kill their prey until they consume their cells.

Complete answer:
Hydra is a genus of invertebrate that belongs to the class Hydrozoa.The body of this organism comprises a thin, normally translucent tube which is about 30 mm long but can contract very high.The body wall is made up of two cell layers, separated from each other by a thin, non- structural layer of connective tissue, namely the mesoglea and the enteron.The bottom end of the body is locked and at the top ends opening intakes both foods as well as waste.A circle of 4 to around 25 tentacles is around this opening.The genus is represented by some 25 different species, especially in colour, length and number of tentacles and location and size of gonads.All Hydra species feed on small animals including crustaceans.

Hydra is a predator. As all Cnidaria, hydra oligactis are strictly carnivorous and consume various types of small crustaceans (Daphnia), larval fish, cyclops, fleas of water, and other invertebrates.Hydra catches their food with the help of nematocysts which are discharged into the predicted organisms and kills it.

Thus, the correct answer is option D.i.e., All of the above.

Note:Hydra has a tubular, radially symmetrical body with a length up to 10 mm and a basic adhesive foot named the basal disc.A sticky fluid is secreted by gland cells in the basal disc.There is a mouth at the free end of the body, with one to twelve small, moving tentacles around it.Every tentacle or cnida is covered in customary cells called cnidocytes, which are highly specialized in stinging cells.