Classification of Living Organisms — Practice Quiz

Ecosystem, species, genetic

The three recognized levels of biodiversity are ecosystem diversity, species diversity, and genetic diversity. Step 1: Ecosystem diversity refers to the variety of different ecosystems like forests, deserts, oceans where organisms live. Step 2: Species diversity means the variety of different species living in a particular area. Step 3: Genetic diversity refers to the variety of genes within species populations. Step 4: These three levels work together to maintain the overall biodiversity on Earth. The other options represent geographical scales, organism types, or habitat types, not biodivers

Eukarya

Domain Eukarya includes all organisms with well-formed nucleus in their cells. Step 1: The word 'Eukarya' comes from 'eu' meaning true and 'karyon' meaning nucleus. Step 2: These organisms have their genetic material enclosed within a membrane-bound nucleus. Step 3: This domain includes plants, animals, fungi, and protists. Step 4: The other two domains (Archaea and Bacteria) are prokaryotes without well-formed nucleus. Bacteria and Archaea have their genetic material freely floating in the cell without a nuclear membrane.

Biosphere

The biosphere is the part of Earth where life exists and can be supported. Step 1: The biosphere extends from about 8 km high in the atmosphere to about 5 km below sea level. Step 2: It includes all living organisms and their physical environment where they interact. Step 3: This zone contains diverse ecosystems like forests, oceans, deserts, and mountains. Step 4: All biodiversity exists within the biosphere. The atmosphere is just the air layer, lithosphere is the rocky layer, and hydrosphere is only the water bodies.

Carolus Linnaeus

Carolus Linnaeus, a Swedish naturalist of the 18th century, introduced the binomial system of nomenclature. Step 1: Linnaeus developed this two-name system to give each organism a unique scientific name. Step 2: The first name represents the genus and the second represents the species. Step 3: This system is used worldwide and helps scientists communicate clearly about organisms. Step 4: His work laid the foundation for modern taxonomy. Darwin is known for evolution theory, Mendel for genetics, and Whittaker for the five kingdom classification.