Question

Гидра относится к кишечнополостным , потому что________. Черты усложнения гидры по сравнению с простейшими заключается в том, что ______.

Answer 1

1) Потому что у нее не кишечник, а кишечная полость.
2) у них есть нервная система, а так же они многоклеточные.
Помимо этого у них есть ткани, органы и системы органов.

Answer 2

Hydra and its Classification

Hydra is a genus of small, simple aquatic animals that belong to the phylum Cnidaria. Cnidaria is a diverse group of animals that also includes jellyfish, sea anemones, and coral. Hydra is classified as a member of the class Hydrozoa within the phylum Cnidaria.

Characteristics of Hydra

Compared to simpler organisms, Hydra exhibits certain characteristics that represent an increase in complexity:

1. Tissue Organization: Hydra has a rudimentary tissue organization, with distinct layers of cells. It possesses an outer layer called the epidermis and an inner layer called the gastrodermis. These layers enclose a jelly-like layer called the mesoglea.

2. Radial Symmetry: Hydra displays radial symmetry, meaning its body parts are arranged around a central axis. This symmetry allows Hydra to capture prey from any direction.

3. Tentacles and Stinging Cells: Hydra has tentacles surrounding its mouth, which it uses to capture and immobilize its prey. The tentacles are armed with specialized stinging cells called cnidocytes, which contain nematocysts. When triggered, these nematocysts release venomous threads that paralyze or kill the prey.

4. Nervous System: Hydra possesses a simple nervous system that allows it to coordinate its movements and respond to stimuli. It has a nerve net, which is a diffuse network of interconnected neurons that transmit signals throughout the body.

5. Asexual Reproduction: Hydra can reproduce asexually through a process called budding. During budding, a new individual grows as an outgrowth from the parent Hydra and eventually detaches to become an independent organism.

6. Regeneration: Hydra has an impressive ability to regenerate lost body parts. If a Hydra is cut into several pieces, each piece has the potential to regenerate into a complete organism.

These are some of the key characteristics that differentiate Hydra from simpler organisms and contribute to its classification as a member of the phylum Cnidaria and the class Hydrozoa