Invertebrate Zoology

Pseudopodia helps both in injestion and movement.

Cliona contains siliceous and monoaxon spicules.

Alternation of generation is observed in Adamsia (coelenterate). Reproduction is asexual in polyp and sexual in medusa stages.

Coelenteron is septate in Carybdea.

Tentacles bear colloblasts in Cestus sps.

Convulata has rod-like structures in the cells of the epidermis called rhabdites.

Its body cavity is lined by nucleated peritoneum.

Calanoida is a copepod and larvae of copepods bear naupliar eye. It is an unpaired median eye.

Obelia is diploblastic and has radial symmetry.

Phasmids are absent in anticoma.

In Leucosolenia, asconoid type of canal system is found. In this, the water current reaches the spongocoel after passing through the ostia and goes out through the osculum.

Goalith birdeater has a maximum lifespan of all the invertebrates given here. Its lifespan is 15-25 years.

In unicellular organisms like Amoeba, food vacuoles are responsible for the digestion of food particles, mirroring the function of the digestive system in multicellular organisms.

Endocytosis is the process by which cells ingest external materials by engulfing them in a portion of the cell membrane.

The contractile vacuole is known as the kidney of the protozoans. Its function is to pump out excess water from the cytoplasm of amoeba. They are most prominent and active in freshwater amoebae as marine amoebae are closer to isotonicity with seawater than freshwater.