dol 3/5

Indicates the greatest number of any species that can indefinitely exist within a specific habitat without threatening the existence of other species also living in that habitat

• carrying capacity
• population density
• population
• population demographics

Tags

NGSS.MS-LS2-1

The San Marcos Salamander, Eurycea nana, is a light reddish-brown translucent salamander about 2-5 cm in length. E. nana is found only in Spring Lake and parts of the San Marcos River. Which human activity would most likely DECREASE the ability of the salamanders to survive?

• Increasing water consumption that decreases the flow of clean water from the spring that feed the river

• public transportation that reduces the number of automobiles that contribute to pollution runoff into the river

• tourism that helps fund the educational programs related to river ecosystem conservation

• the addition of a new food source into the river that limits competition for resources

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-ESS3-4

During secondary succession, which of these best describes why decomposing pioneer plants give way to larger, more complex plant species, such as hardwood trees?

• Increased amounts of sunlight are able to reach the ground while pioneer species are decomposing

• Increased soil temperatures from decomposing pioneer species help tree seeds germinate more quickly

• Increased amounts of decomposing pioneer species remove nutrients that tree seedlings need to grow and mature

• Increased amounts of soil from decomposing pioneer species allow plants with more extensive root systems to become established

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Examples of how humans negatively affect local ecosystems are

• Building dams, deforestation (cutting down trees), adding point sources to nearby streams to allow for run-off, building roads and structures, and salting roads.
• Creating laws to prohibit fishing from local streams.
• Planting trees and other plants to attract native species.
• Removing non-native species from the environment.

Tags

NGSS.MS-LS2-4

NGSS.MS-ESS3-3

Which role of protists has the most positive effect on maintaining the plant population in an ecosystem?

• Protists are a major food source for animals

• Protists produce approximately 75 percent of the oxygen on Earth

• Protists decompose dead materials. returning nutrients to the soil

• Protists found in the gut of animals assist in digestion

Tags

NGSS.MS-LS2-4

Growth of biological organisms which goes on unhindered when resources are unlimited.

• population density
• carrying capacity
• exponential growth 
• survivorship curve

Tags

NGSS.MS-LS2-1

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

• There would be a decrease in the small bird population.
• There would be a decrease in the grass/flowers population.
• There would be a decrease in the mice population.
• There would be an increase in the grass/flowers population.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-LS2-2

Examples of how humans negatively affect local ecosystems are

• Building dams, deforestation (cutting down trees), adding point sources to nearby streams to allow for run-off, building roads and structures, and salting roads.
• Creating laws to prohibit fishing from local streams.
• Planting trees and other plants to attract native species.
• Removing non-native species from the environment.

Which role of protists has the most positive effect on maintaining the plant population in an ecosystem?

• Protists are a major food source for animals

• Protists produce approximately 75 percent of the oxygen on Earth

• Protists decompose dead materials. returning nutrients to the soil

• Protists found in the gut of animals assist in digestion

A feeder fish usually follows behind sharks to pick up food scraps that they leave behind. The fish gets food and the shark is unaffected. This is an example of:

• Mutualism

• Commensalism

• Parasitism

• Decomposition

Tags

NGSS.MS-LS2-2