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biology 20 unit B exam with correct answers
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biology 20 unit B exam with correct answers
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biology 20 unit B exam with correctanswers
Everything that affects an organism throughout its life as well as everything that the
organism affects - Answers -environment
A group of individuals that live In a specific area over a specific time. - Answers -
population
Organisms that are able to breed with on another and produce fertile offspring. -
Answers -species
Many populations in a given area in a given time. - Answers -community
They change as abiotic conditions in an environment change. Changes in one
population in a community will affect the other populations in the community. - Answers
-dynamic community
A community of populations together with the abiotic factors that surround and affect it. -
Answers -ecosystem
-Includes all parts of the earth that are inhabitable by some type of life.
- all ecosystems in the world and their interactions make up the biosphere.
- the biosphere can be considered the largest possible ecosystem. - Answers -
biosphere
-taxonomy is the practice of classifying living things.
-taxonomy is constantly changing as the sophistication of the tools for observation and
analysis increases.
-new species are being discovered and known species are being reassessed. -
Answers -taxonomy
-Aristotle first grouped living things into plants and animals.
-he called each group a kingdom.
-the kingdoms became known as kingdom plantar and kingdom Animalia.
-although there were flaws with Aristotle's system and it changed with time.
-the two category system was used until the invention of the microscope. - Answers -
Aristotle's classifying system
-proposed a third kingdom--Protista
, -this kingdom accounted for the micro-organisms - Answers -german scientist Ernst
Haeckel
-the system used today has 3 domains.
-within one of these domains are a number of kingdoms - Answers -modern
classification system
the 3 domains of life are:
1.eukarya:
unicellular or multicellular organisms with a membrane bound nucleus.
2.bacteria:
prokaryotic(no membrane bound nucleus) unicellular organisms.
3.archaea:
prokaryotic unicellular organisms with a unique genetic makeup that are capable of
living in extreme environments. - Answers -3 domains of life
Eukarya, bacteria, archaea
-Remaining four kingdoms are within the domain eukarya.
-They are Protista, fungi, Plantae and Animalia. - Answers -the kingdoms of life
-unicellular and multicellular organisms called protists.
-some use photosynthesis, others ingest their food, and some obtain nutrients while
decomposing and absorbing their food.
-examples of protists include euglena and algae. - Answers -protista
-obtain their food by secreting digestive enzymes and then absorbing the molecules
released.
-do not photosynthesize (no chloroplasts)
-examples include mould, yeast, and mushrooms. - Answers -fungi
-organisms the photosynthesize to make their own food.
-most plants are sessile (can't move) and multicellular, with complex, and specialized
cells.
-examples include mosses, ferns, coniferous plants, and flowering plants. - Answers -
plantae
-scientists group organisms in a hierchical fashion.
-the categories become increasingly precise.
-the categories are domain, kingdom, phylum, class, order, family, genus, species. -
Answers -levels of classification
-Swedish biologist Carolus Linnaeus was the first to subdivide the kingdoms into smaller
groups of similar organisms.
-today scientists use the binomial system devised by Linnaeus to name organisms.
-organisms are named in latin.
-organisms are given a 2 part name based on their classification.
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