Diversity in The Living Organsims Test - 2

Bryophyta produces spores and embryo, but lacks vascular tissues and seeds. They are amphibians of plant kingdom.

Gymnosperms are evergreen and woody plants. This plant group has seeds, but they lack flowers and fruits. Angiosperms are the flowering plants.

Naked seed condition of gymnosperms stands in contrast to the seeds and ovules of flowering plants (angiosperms), which are enclosed within an ovary.

Among these, animals possess excretory organs.

Canal system is a characteristic feature of 'Porifera'.Body of all sponges is the perforated by large number of apertures through which water enters Inside body and flows through a system of criss-crossing canals collectively forming the canal system .

Both roundworms and flatworms are triploblastic.means an animal having a body composed of three embryonic cell layers: the ectoderm, mesoderm, and endoderm.

Roundworms are bilaterally symmetrical.The symmetry helps the body be streamlined, allowing the organism to move. Two organisms that have bilateral symmetry other than the roundworm are butterflies and crabs.

Among these, Antedon is an echinoderm.Antedon is a genus of free-swimming, stemless crinoids. The genus first appeared in the fossil record in the Cretaceous period.

Amon these, echinoderms possess water vascular system.The system is composed of canals connecting numerous tube feet. Echinoderms move by alternately contracting muscles that force water into the tube feet, causing them to extend and push against the ground, then relaxing to allow the feet to retract.

Echinoderms possess coelom or body cavity.Echinoderms possess a unique water vascular system. This is a network of fluid-filled canals derived from the coelom (body cavity) that function in gas exchange, feeding, sensory reception and locomotion.