8th grade UNIT 2

A small group of goats are kept in the petting section of a local zoo. Competition would occur between goats in this area if which of the following changes were made?

• Adding to the amount of food given to the goats

• Increasing the number of goats in the petting area

• Giving the goats water less each day for a month

• Allowing fewer people access to petting the goats

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

In a forest, two trees are growing next to each other. Which of the following describes two natural resources that both trees compete for in this area?

• sunlight and water

• Root strength and length

• cellular structure and function

• access to nesting birds and insects

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NGSS.MS-LS2-1

In order for organisms to compete for resources, the resources must be limited.

• True

• False

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NGSS.MS-LS2-1

Which of the following is an example of a way in which rainforest plants depend on other organisms to meet a need?

• Absorbing sunlight to make their own food

• Drawing water from the soil with their roots

• Adding material to the soil when they decay

• Reproducing when insects pollinate them

Tags

NGSS.MS-LS2-2

A student wants to investigate competition between two populations of organisms. The investigation will need to include two species that -

• Have the same needs

• Reproduce at a slow rate

• Do not depend on water

• Live in different biomes

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

A mongoose depends on other living organisms when it does all of the following EXCEPT

• eating seeds

• hiding in tall grass

• stealing bird eggs

• nests in a burrow

Which two organisms in this food web are COMPETING for food with each other?

• Cougar and Deer

• Shrew and Mouse

• Rabbit and Snake

• Insects and Grass

A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added. The graph models growth of the bacteria over time.

Which of these most likely explains why the bacterial population stopped growing?

• The bacteria competed for nutrients and died after all the nutrients were consumed.

• The bacteria did not reproduce in the system, and eventually each individual died at the end of its life cycle.

• The bacteria mutated from photosynthetic to carnivorous organisms and consumed one another until all the individuals were dead.

• The bacteria became diseased and were unable to survive in the closed system.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The Prairies Region and the Cross Timbers are located in north-central Texas. The graph above shows information about eating habits of white-tailed deer in these regions.

A Cross Timbers rancher is concerned about competition between the ranch animals and the deer.

Based on the graph, which ranch animals compete for the most food with white-tailed deer?

• Cattle that eat grass and feed

• Goats that eat weeds and shrubs

• Turkeys that eat seeds and fruit

• Hogs that eat fruit, seeds, and feed

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Water with which of these conditions would cause the most competition for resources among all three species of fish?

• Very cold, very clear, and very fast

• Very warm, very clear, and very slow

• Mild temperatures, some suspended particles, flows very fast

• Mild temperatures, some suspended particles, flows at medium speed

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4