Williams BIO 1302 Assignment 3

QUESTION 1

With __________, one species may negatively affect another, but will not be affected positively or negatively.

		amensalism
		commensalism
		mutualism
		parasitism

10 points   

QUESTION 2

Vultures feed largely on carrion (dead animals). Their role in the ecosystem is largely as that of a ___________.

		predator
		true predator
		scavenger
		parasite

10 points   

QUESTION 3

The yucca moth interacts with the soapweed yucca in which way?

		The moth pollinates the flowers so the larvae can eat the seeds.
		The plant provides shelter for adults.
		The moth larvae feed on the roots of the plant.
		The yucca secretes chemicals that kill the moth.

10 points   

QUESTION 4

Cattle egret follow herds of cattle and feed on both the insects stirred by the movement of the cattle and the biting insects that irritate the cattle. This is an example of:

		parasitism.
		predator-prey.
		mutualism.
		amensalism.

10 points   

QUESTION 5

Harvesting timber in such a way that only select trees are cut and the population of those trees within the targeted forest is allowed to return to the carrying capacity is an example of ___________.

		give-and-take strategy
		yield
		sustainable yield
		over-harvesting

Match the organisms to the relationship.

orchid / tree                                                                          coyote / rabbit                                                                          yucca moth / soapweed yucca                                                                          cowbird / warbler                                                                          tapeworm / human

A. predator-prey B. amensalism C. brood parasitism D. parasite E. mutualism F. commensalism

QUESTION 7

1. Pick the phrase that best matches each term

Heterotrophic                                                                          Autotrophic                                                                          Producers                                                                          Primary consumers                                                                          Secondary consumers

A. organisms that feed on herbivores (carnivores) B. self-feeding organisms, photosynthetic C. organisms that eat plants (herbivores) D. two species that feed on the same prey organism E. organisms that feed on other organisms F. organisms at the base of the food web, autotrophs