Question

The main cavity in the body of Hydra is known as
a) Gastrovascular cavity
b) Schizocoel
c) Haemocoel
d) Pseudocoelom

Answer 1

Hint: Hydra is a small freshwater organism. They are invertebrates and live in tropical regions. The body cavity is also known as coelenteron.

Complete Answer:
The special characteristic feature of Hydra is its regenerative capability. Hydra is made of two layers of body cells, that are separated by a thin wall. Hydra has a radially symmetric body. The lower portion of hydra is closed. It has a single opening at the top, that’s used for both digestion and ejection of food. Tentacles are present around this opening. Hydra has a large single body cavity known as gastrovascular cavity. The cavity in the body of Hydra is enclosed by the body wall. This cavity contains intestinal organs. The digestion and circulation system functions are performed by the gastrovascular cavity.
The process by which some animal embryos develop is known as Schizoceoly. When the mesoblast of the embryo splits, a perivisceral cavity arises. This is known as Schizocoel.
In most of the invertebrates like insects, the primary body cavity named haemocoel is present. It contains the circulatory fluid. Insects do not have blood vessels like mammals. Instead, insects have a cavity that is completely made of insect blood. All organs of the insect are seen in this cavity.
Worms have Pseudocoelom. They are the fluid-filled body cavity.

Hence the correct answer is option ‘b’.

Note: Hydra reproduces by budding. The offsprings will be formed as a lump on the parent. They grow and eventually they break off from the parent body and grow as an individual hydra.