chapter 3 the biosphere
3-1 and 3-2
Terms in this set (25)
scientific study of interactions among organisms and between organisms and their surroundings.
contains the combined portions of the planet in which all of life exists, including land, water , and air/ atmosphere.
a group of organisms so similar to one another that they can breed and produce fertile offspring.
groups of individuals that belong to the same species and live in the same area.
assemblages of different populations that live together in a defined area.
a collection of all the orgainisms that live in a particular place, together with their non living or physical enviroment.
a group of ecosystems that have the same climate and similar dominant communities.
plants, some algae, and certain bacteria capture energy from the sun or chemicals and use that energy to produce food.
organisms that make their own food.
autotrophs use light energy to power chemical reactions that convert carbon dioxide and water into oxygen and energy rich carbohydrates such as sugars and starches.
when organisms use chemical energy to produce carbohydrates. (performed by several types of bacteria)
organisms that rely on other organisms for their energy and food supply.
organism that rely on other organisms for its energy and food supply; also called a heterotroph
obtain energy by eating only plants. (cows, & caterpillars)
eats other animals. (humans,bears, and crows)
eats both plants and animals.
feeds on animal and plant remains and other dead matter. (mites,crabs,& earthworms)
breaks down organic matter. (bacteria and fungi)
a series of steps in which organisms transfer energy by eating and by being eaten.
relationships among the various organisms in an ecosystem form a network od complex interactions.
each step in a food web or chain.
diagram that shows the relative amounts of energy or matter contained within each trophic level in a food chain / web.
shows the amount of living tissue in a trophic level expressed in grams per unit area.
shows how energy reduces by 90% each trophic level.
- 10% used for life prosses & rest is lost as heat.
pyramid of numbers
shows the number of organisms in a trophic level.