Bio Ch53 Activities Quiz

What is the relationship between colonizing success and the number of species already established on an island?

As the number of established species on an island increases, colonizing success also decreases. ( As the number of established species on an island increases, there is likely to be a concomitant increase in the intensity of competition and predation, which make colonization more difficult.)

According to island biogeography, what is the relationship between an island's distance from the mainland and the number of species present on the island?

The farther an island is from the mainland, the fewer the number of species found on the island.

Why is a new island more hospitable to colonizers than an older island is?

The intensity of both competition and predation is less on the newer island.

Which of these is a starting point for primary succession?

a surface exposed by a retreating glacier

An egret eats insects stirred up by grazing animals. Which of these terms applies to the relationship between the egret and the grazing animal?

commensalism

Humans and sharks both eat fish. Which of these terms applies to the relationship between the human and the shark?

competition [ The human and the shark are both competing for a resource (fish).]

An earthworm that feeds on the remains of plants and animals is acting as a _____.

detritivore

Humans who have pets tend to be healthier than humans who do not have pets. Which of these terms applies to the relationship between a human and a pet?

mutualism

Which of these terms applies to the relationship between a dog and a blood-sucking tick?

parasitism

A human eats a deer. Which of these terms applies to the relationship between the human and the deer?

predation ( The human is the predator and the deer is the prey.)

A cow eating grass is an example of a _____.

primary consumer

In an ecosystem, phytoplankton are _____.

producers

When a human eats a steak, the human is acting as a _____.

secondary consumer

A human who just ate a hamburger is eaten by a shark while swimming. The shark is acting as a _____.

tertiary consumer

The number of species on an island remains relatively constant when _____.

the rate of successful colonization equals the extinction rate