Unit 9 Target 2 (Part 2): Symbiosis

1. Cattle egrets are birds that mostly feed on insects that have been disturbed by grazing cattle.  The cattle are neither helped nor harmed by the presence of the egrets.  This relationship is an example ofa.    commensalism.    c.    parasitism.    b.    competition.         d.    mutualism.

2. Which of the following is NOT and example of symbiosis? a.    Commensalism    c.    Mutualism    b.    Competition         d.    Parasitism

3. A flagellated protozoan lives within the intestines of a termite and helps it digest wood. What type of relationship most likely exists between the protozoan and the termite?a.    Competitive     c.    Parasitic    b.    Mutualistic       d.    Predatory

4. 1    Both organisms benefit from the activity of each other.    2    One organism benefits, and the other organism neither benefits or is harmed.    3    One organism obtains its nutrients from another, and the other organism may weaken due to deprivation.    Refer to the chart above, The relationship in line 1 in the table is calleda.    parasitism.           c.    mutualism.    b.    commensalism.    d.    predation. 

5. A certain species of protist lives within the intestines of a termite. After the termite chews and swallows wood, the protist enzymatically digests the wood, providing a usable source of energy for both itself and the termite. The relationship between the protist and the termite is best described as:a.    competitive    b.    mutualistic    c.    parasitic    d.    predatory

6. Epiphytes are plants such as orchids and staghorn ferns that grow on the outside of other plants without taking any nourishment from them. The tree is the host and provides the branches that support the epiphytes but the tree is not harmed and receives no benefit. Epiphytes and trees represent what kind of interaction with each other?a.    Commensalism    c.    Parisitism    b.    Competition         d.    Mutualism

7. 1    Both organisms benefit from the activity of each other.    2    One organism benefits, and the other organism neither benefits or is harmed.   3    One organism obtains its nutrients from another, and the other organism may weaken due to deprivation.    Refer to the list above.  Which pair of organisms generally exhibits the type of relationship described in line 1 of the list?a.    Cuckoo birds lay eggs in a warbler's nest.  The cuckoo's young will displace the warbler's young and will be raised by the warbler.    b.    Mistletoe extracts water and nutrients from the spruce tree.    c.    Parasitic worms infect and absorb nutrients from white-tailed deer.    d.    Hummingbirds pollinate plants while drinking flower nectar.  The flowering plants produce the nectar.

8. Which of these statements is true of parasitism?a.    The presence of a parasite does not affect the host.    b.    Parasitism is identical to predation.    c.    The presence of a parasite may make an animal more susceptible to predation.    d.    Parasitism is a cooperative relationship between two species.

9. An oxpecker is a bird that usually feeds on parasites on a rhinoceros's back. It occasionally picks scabs off the rhinoceros's back and drinks blood from the wounds. Describe the relationship(s) between the oxpecker and the rhinoceros.a.    mutualism only                  c.    mutualism and parasitism    b.    mutualism and predation    d.    mutualism and commensalism