Sea anemones

●It is an invertebrate aquatic animal marked by soft bodies and has an ability to sting.

●They are a group of predatory marine animals constituting the order Actiniaria.

●Because of their colourful appearance, they are named after the Anemone, a terrestrial flowering plant.

●As cnidarians, sea anemones are related to corals, jellyfish, tube-dwelling anemones, and Hydra.

●Unlike jellyfish, sea anemones do not have a medusa stage in their life cycle.

●A typical sea anemone is a single polyp attached to a hard surface by its base, but some species live in soft sediment, and a few float near the surface of the water.

●They are known to form symbiotic relationships with other animals; their most well-known alliance is with clownfish.

●They use nematocysts, which are specialized cells containing venomous organelles called cnidocysts, to capture prey and defend themselves against predators.

Class: Hexacorallia

Eats: True crabs

Phylum: Cnidaria

Scientific name: Actiniaria

Domain: Eukaryota

Kingdom: Animalia

PRACTICE QUESTION

Q. Consider the following statements about Sea Anemones:

1. Most sea anemones form symbiotic relationships with photosynthetic algae known as zooxanthellae.
2. Sea anemones capture prey using specialized stinging cells called nematocysts.
3. Sea anemones lack a centralized nervous system but possess a decentralized nerve net.
4. Some species of sea anemones are capable of asexual reproduction through a process called fragmentation.

How many of the above statements is/are correct?

A.only one

B.only two

C.only three

D.All four

Ans: B