8th Grade Ecosystems

Which is the best example of predation in an ecosystem?

• bee and flower
• fox and rabbit
• flea and rat
• mosquito and human

Tags

NGSS.MS-LS2-2

Mountain pocket gophers are native to Nevada. Which activity of the gopher transfers energy from one trophic level to another in its ecosystem?

• reproducing with other gopher species
• storing food underground
• digging burrows to live in
• eating the roots of many plants

Tags

NGSS.MS-LS2-3

Which represents a positive consequence of competition within an ecosystem?

• decreased rate of reproduction
• elimination of inferior organisms
• increased need for natural resources
• elimination of entire species of organisms

Tags

NGSS.MS-LS2-4

Which of these is an abiotic element of a desert ecosystem?

• sand
• cactus
• lizard
• scorpion

Tags

NGSS.MS-LS2-3

If krill is a primary food source for a local population of whales, which will most likely happen to the whales if the krill population suddenly doubles?

• The whales will have to compete more with each other for available food.
• The whales will have to find another food source or risk starvation.
• The whales will migrate to another area.
• The whales will increase in number.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which human action would most likely increase the population of cave-nesting animals in an ecosystem?

• cutting nesting trees
• tracking nesting foxes
• adding nesting boxes

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which best describes the effect of human society on a freshwater ecosystem?

• Movement of minerals and stones due to flowing water in a stream results in a constantly changing water bed.
• Erosion caused by running water breaking down the river bank changes the geography of the river bed over time.
• The discharge of hot water into a freshwater ecosystem results in decreased levels of oxygen available to organisms.

Tags

NGSS.MS-ESS3-3

NGSS.MS-LS2-4

A woodland area where deer live is partially cleared to build homes for people. Which best describes how the deer population will change as a result of clearing the land to build homes?

• The deer population will increase.
• The deer population will decrease.
• The deer population will remain the same.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which is an example of parasitism?

• cat and mouse
• tadpole and frog
• human and tapeworm

Tags

NGSS.MS-LS2-2

The following is a food chain observed in a large wilderness park.
Vegetation → Deer → Cougar
A swarm of insects consumes 70% of the vegetation in the park. As a result, which of the following willMOST likely occur?

• The prey will decrease in numbers.
• The predator will increase in numbers.
• The prey will be unaffected.
• The predator will be unaffected.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4