Diversity in The Living Organsims Test - 4

Monocots are plants having seeds with one cotyledon whereas dicots have two cotyledons.

Organisms of kingdom Plantae have indefinite growth. Historically, all organisms known were grouped into only two kingdoms. Organisms that had finite growth, moved and ate were grouped into the kingdom Animalia. Organisms that had indefinite growth, did not move and did not eat were grouped into the kingdom Plantae.

Chloroplasts are ribbon-shaped in Spirogyra.In spring Spirogyra grows under water, but when there is enough sunlight and warmth they produce large amounts of oxygen, adhering as bubbles between the tangled filaments.

Bryophytes are amphibians of plant kingdom. They are the oldest of all lineages of land plants and are believed to be a vital link in the migration of plants from aquatic environments onto land.

Scorpions, spiders and crabs belong to the phylum Arthropoda. An arthropod is an invertebrate animal having an exoskeleton (external skeleton), a segmented body and jointed appendages.

'Jointed legs' is a characteristic feature of Arthropods. The Arthropod body plan consists of segments, each with a pair of appendages. The rigid cuticle inhibits growth, so Arthropods replace it periodically by moulting.

Respiration is accomplished in arthropods by book lungs, tracheae and gills.

Pisces have a three-chambered heart.Pisces is a Class in the Subphylum Vertebrata of the Phylum Chordata.

Amphioxus is a protochordate, also called lancelet. They are small marine animals found widely in the coastal waters of the warmer parts of the world and less commonly in temperate waters.

Notochord is a characteristic feature of protochordates. This group is composed of the phylum Hemichordata and the subphyla Urochordata and Cephalochordata.