Trans Pecos Ecological Tour and Online Lessons

Ecology is the study of how organisms interact with their environment. These interactions may be in the form of symbiotic relationships. There are three common types of symbiosis that occur between two organisms of different species: parasitism, mutualism, and commensalism.

Use the following words to fill in the spaces below about desert ecology and forms of symbiosis. For help, click on the "hint" button for a web hint. To print this page and turn in to your teacher, press PRINT on your browser.

angiosperms	cross-pollination
commensalism	invertebrates
javelina	mutualism
pheromone	pollen
parasitism	photosynthesis
prickly pear	seed dispersal

(1) occurs when two organisms interact in away that is beneficial to both.

(2) When one organism benefits and the other organism suffers, the relationship is called {must read web hint carefully!}

(3) However in , one organism benefits and the other is unaffected. Examples of these relationships in the Trans-Pecos are listed below.

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To print this page, press "print" on your browser and turn in to your teacher. Quiz follows the end of this activity.