Relationships between Organisms (7.L 17.2)

While grazing, a buffalo stirs up insects. These insects are eaten by cattle egrets. What type of interaction does the cattle egret exhibit with the buffalo?

• Mutualism

• Commensalism

• Parasitism

• Predation

Two interactions within an ecosystem are predation and parasitism. In predation, predator organisms feed on prey organisms. In parasitism, parasites depend on host organisms. Which of the following correctly describes the relative numbers of organisms in parasitism or predation?

• The number of parasites is usually greater than the number of host organisms.

• The number of predators is usually greater than the number of prey organisms.

• The number of parasites is always equal to the number of host organisms.

• The number of predators is always equal to the number of prey organisms.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Researchers argue that some bacteria found in the human gut are in a symbiotic relationship with humans, called mutualismWhich of the following observations is consistent with this argument?

• Bacteria increase the risk of cancer in humans.

• Disease in humans is not caused by bacteria.

• Bacteria provide vitamins to humans.

• The same nutrients are used by bacteria and humans.

The relationships that organisms have with one another are an important part of the balance among species within ecosystems. Which type of symbiotic relationship occurs when ecological niches overlap and multiple organisms seek the same resources?

• Parasitism

• Commensalism

• Predation

• Competition

Tags

NGSS.MS-LS2-2

The graph provided presents information on changes in the population of a predator and its prey over time. Which of the following best explains the increases and decreases in the predator population?

• There were variations in the food supply.

• Predators migrate frequently.

• The paramecium competed with the yeast.

• Populations always achieve a stable level.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

NGSS.MS-LS2-1

Thomas's dog Max has fleas. The fleas live by feeding on Max's blood. Meanwhile, Max is constantly scratching and does not feel well. The relationship between the fleas and Max can be classified as which of the following?

• Competition

• Mutualism

• Parasitism

• Commensalism

An eagle and a grizzly bear both feed on the same species of salmon in the same location. Which type of symbiotic relationship is displayed by the eagle and the bear?

• Competition

• Commensalism

• Predation

• Parasitism

Tags

NGSS.MS-LS2-2

Mutualism is a long-lasting, mutually beneficial interaction among organisms. Which of the following relationships best reflects mutualism?

• A starfish provides a safe place for sea worms to reside; the starfish receives nothing in return.

• Reef corals build a hard protective skeleton that algae live in; the algae provide energy to the coral through photosynthesis.

• Butterfly larvae lay their eggs on jaguars and consume blood and nutrients from the jaguars.

• Galapagos tortoises eat all the branches of cactus plants; the plant is harmed and sometimes dies.

Tags

NGSS.MS-LS2-2

Three-spined sticklebacks that harbor a tapeworm are less likely to perform courtship behavior correctly and are less successful at reproducing. An image is provided. The tapeworms relationship to sticklebacks can be classified as which of the following?

• Competition

• Mutualism

• Commensalism

• Parasitism

Tags

NGSS.MS-LS1-4

Lindsey is watching honeybees in her grandmother's garden. Her grandmother explains that the bees are helping the flowers to reproduce and in return, bees are gathering the plant's nectar for food. What type of interaction do the honeybees exhibit with the flowers in Lindsey's grandmother's garden?

• Mutualism

• Commensalism

• Parasitism

• Predation

Tags

NGSS.MS-LS2-2