Exam 55: Species Interactions

Which of these interactions does not represent a typical parasite-host interaction?

The biochemical diversity of plants is primarily due to

Although lichens look like single organisms, they are actually an association between a fungus and a photosynthetic partner, usually an alga.The lichen association is considered mutualistic, but the relationship also shows some features of parasitism.Which fact about lichens suggests parasitism rather than mutualism?

Which type of interaction would be least likely to lead to coevolution of the interacting species?

The protist that causes malaria and the various viruses that cause influenza are examples of microparasites that are also _______.

Adult monarch butterflies contain glycosides that are toxic to predators.The glycosides originate from

Sap-sucking insects called aphids often occur on alder trees.The aphids excrete sugary honeydew, which is eaten by ants.In turn, the ants protect the aphids from other insects.The aphids and alder trees have a _______ relationship; the aphids and ants have a _______ relationship.

The spines of a cactus and the deadly chemicals produced by the foxglove are examples of plant defenses against _______.

If a predator species were incapable of learning, which of the following would be the least adaptive for its prey?

The type of interaction in which one partner is harmed but there is no effect on the other is called _______.

Termites live on cellulose from dead wood.They depend on protists in their guts to provide enzymes that can digest wood.Protists would die outside the termites, and the termites would starve without the protists to aid in digestion.This is an example of

Which factor would not be a benefit to members of a mutualism in a stressful environment?

Refer to the table showing major types of interactions between species and the positive or negative influences of each interaction type. What symbols should replace the "Y" and "Z," respectively, in the table?

Refer to the figures showing results of laboratory experiments that grew two species of Paramecium together. Explain the difference in the two graphs.That is, how is the interaction between P.aurelia and P.caudatum different from the interaction between P.caudatum and P.bursaria?

In New Zealand, mistletoes grow on beech tree hosts, receiving water and nutrients from the trees without harming them.Mistletoes, in turn, provide nectar and fruit to bellbirds.What benefits, if any, do bellbirds most likely provide to mistletoes?

A bird eats cherry seeds but does not digest the seeds.It excretes the seeds at some distance from the cherry tree, where they then germinate.This type of interaction is _______.

Refer to the table showing major types of interactions between species and the positive or negative influences of each interaction type. What type of interaction is represented by the "X" in the table?

Which interaction does not cause a species' realized niche to be more restricted than its fundamental niche?

Which relationship has negative consequences for both species involved?

The microscopic roundworm Caenorhabditis elegans is a host for the pathogenic bacterium Serratia marcescens.Researchers genetically manipulated the mating system of C.elegans, producing populations that mated either sexually or asexually (by self-fertilization).When exposed to the S.marcescens parasite, self-fertilizing populations of C.elegans rapidly became extinct.Sexually reproducing populations survived.This suggests that, to maintain healthy populations, C.elegans requires