Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Name: _____________________________________________ Date: _____________________ Class: ______ Symbiosis Organisms in an ecosystem interact in many different ways. One very common relationship is that of predator to prey (which we have covered extensively). Another type involves long-term, intimate association between two different species: symbiosis. Below are brief descriptions of three types of symbiotic relationships. Commensalism is a relationship in which one partner benefits while the other is neither harmed nor benefited. Mutualism is an association in which both members benefit. Parasitism is a widespread nutritional strategy in which one member of the couple harms the other. The exploiting member is the parasite, the other is the host. The following situations illustrate various ecological relationships. Identify which relationship is being described in each situation (commensalism, mutualism, parasitism, or predation). 1. Mites (8 legged organisms similar to spiders) live in the base of eyelashes of people who use mascara; they do not seem to harm people. __________________ 2. A coyote captures, kills, & eats a rabbit. __________________ 3. A tapeworm lives in the intestines of dog. It absorbs the food the dog has eaten & grown larger in the process. The dog becomes weak from malnutrition. __________________ 4. Birds eat insects that the hooves and muzzles of grazing cows disturb. __________________ 5. The flower of the yucca plant provides the only location where the yucca moth can lay her eggs. In the process, the moth pollinates the yucca flower. __________________ 6. Cleaner Shrimp living in the ocean eat ectoparasites off the surface of fish. __________________ 7. Bacteria that live on the surface of our teeth require sugar from our food to survive. A by-product of their metabolism decays the enamel of teeth. __________________ 8. A 6 point buck is killed by a hunter. __________________ 9. Bacteria in the intestines of cows produce vitamin C, enabling cows to skip orange juice for breakfast. __________________ 10. Nitrogen-fixing bacteria live in the roots of some plants. They provide nitrogen in a form that plants need and obtain a “home” & nourishment from plants. __________________ 11. Nematodes (a round worm) live in plants & gain nourishment from the plant, but do not seem to harm it. __________________ 12. E. coli lives in massive quantities in the large intestines of humans. They produce vitamin K which aids in blood clotting. (It is unknown if this vitamin is absorbed here though.) __________________ 13. Aspen trees provide shade for small spruce and fir trees, which do not do well in direct sunlight. __________________ 14. Insects lay eggs in the buds of spruce trees. The insect larvae live off the plant material and prevent the bud from developing normally. __________________