Diversity in Living Organisms - 2

Blue-green algae, nitrogen fixing bacteria and archaebacteria are placed in Kingdom Monera. 

Among these, monerans are the most primitive organisms.They include various types of bacteria and blue-green algae.

Among these, the greatest diversity is found in Protista. There are more than 200,000 known species of protists with many more yet to be discovered. 

In three kingdom classification, organisms like yeasts and rhizopus are included in Kingdom Plantae.

Species are the group of organisms which interbreed among themselves.A species is one of the basic units of biological classification and a taxonomic rank.

Yeasts belong to Kingdom Fungi.Yeast size can vary greatly depending on the species, typically measuring 3–4 µm in diameter, although some yeasts can reach over 40 µm.[4] Most yeasts reproduce asexually by mitosis, and many do so by an asymmetric division process called budding.

  Unicellular eukaryotesare included in Kingdom Protista. examples - amoeba, diatom, euglena, paramecium, some algae (unicellular), etc.

Arranging organisms into groups is defined as classification. 

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.

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

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

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.

Organisms kingdom Plantae have indefinite growths. 

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

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

Among the given options, kingdom is the highest category in taxonomy. 

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.

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.

Mushroom is a saprophyte, which obtains nutrients from dead organic matter.

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.