The Guam rail is a flightless bird found on the island of Guam. It builds a shallow nest on the ground & lays eggs. There are no native species of snakes on Guam; so the Gaum rail had no experience with snake predators until the brown tree snake was accidentally introduced. These snakes, which eat a wide variety of species, quickly grew in population on Guam. How was the Guam rail most likely affected by the introduction of the brown tree snake?

The population of the Guam rail declined, and the species nearly became extinct.

The brown tree snake ate only species that lived in trees, so it had no effect on the Guam rail

The Guam rail quickly developed the ability to fly in order to escape from the brown tree snake

The Guam rail began to build its nests in trees.

The main function of this human body system is to-

exchange gases with the environment

chew food as it enters the mouth

trap particles that enter the nose

Many Texas caves provide a habitat for animals that live in total darkness. The caves are damp and cool, and most of the caves are rich in the mineral calcite. The diagram below shows the relationships of some organisms involved in a cave ecosystem.Based on the diagram, which of the following statements is valid?

Owls are predators of bats, and bats are predators of moths.

Beetles compete with bats and cave spiders.

Which of these human activities is most likely to cause the excessive growth of phytoplanktonin the world’s oceans?

The use of chemical fertilizers that are carried by runoff into rivers

The logging of old-growth forests, which results in erosion

The spraying of chemical herbicides that reduce carbon dioxide in the air

The mining of fossil fuels, which requires digging underground tunnels

Which two types of organisms in this aquatic food web have a producer–consumer relationship?

Microscopic algae and white suckers

Small invertebrates and amphipods

The graph be shows the range of water conditions preferred by three species of fish in anOzark stream. Water with which of these conditions would cause the most competition for resources amongall three species of fish?

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

Very cold, very clear, and very fast

Very warm, very clear, and very slow

Mild temperatures, some suspended particles, flows very fast

Scientists are studying the effects of climate change on the Baltic Sea. Some scientists predict that if current trends continue, the Baltic Sea will become less salty, and it will contain less dissolved oxygen. As a result of these changes, the Baltic Sea will have less biodiversity. The location of the Baltic Sea is shown on the map. Which statement best explains why biodiversity in the Baltic Sea could decrease if thesechanges occur?

Plants and animals adapted for living in saltier conditions will not be able to survive and reproduce.

Fewer types of plants and animals are found in warm water than in cool water.

Plants and animals adapted for living in saltwater will grow more slowly in water that has less salt.

Animals adapted for living in warm water will eat all the plants and animals adapted forliving in cool water

Copper compounds are used in large amounts to control the growth of algae and other aquatic plants. Copper interferes with photosynthesis in these organisms. What would be the most likely result of an accidental spill of these compounds in an aquatic environment?

The plant populations would be reduced.

The fish would grow larger than usual.

The zooplankton population would increase.

The plants would increase in size but decrease in number.

Tropical rain forests have the greatest biodiversity of any type of land ecosystem. How does biodiversity contribute to the sustainability of an ecosystem?

The presence of more species with different adaptations makes it more likely that someorganisms will survive an ecological disaster.

Greater genetic variation within species makes it more likely that some individuals willsurvive a disease outbreak.

The presence of a variety of herbivore species that can feed on a large number of differentproducer species helps ensure abundant prey for predators in the ecosystem.

Which of these cell components are most involved in determining the basic shape of each girl’s face?

AGenes, chromosomes, and nucleus

Cytoplasm, chloroplasts, and genes

Vacuoles, nucleus, and chromosomes

Chromosomes, chloroplasts, and vacuoles

STAAR Category 4

Quiz

•

Biology

•

8th Grade

•

Practice Problem

•

Hard

•

NGSS

MS-LS2-4, MS-LS2-1, MS-LS1-6

+13

Standards-aligned

Charles Martinez

FREE Resource

31 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The part of a cell that contains the chromosomes (wound up DNA) in Eukaryotic cells.

Chloroplasts

Cell Wall

Nucleus

Homeostasis

The genetic code for all of your traits.

Nucleus

DNA

Chloroplast

Recessive gene

The organelle inside a plant cell that converts sunlight into energy.

Chloroplast

Photosynthesis

Parasite

Cell Wall

The part of a plant cell that is rigid & permeable.

Chloroplast

Turgor Pressure

Cell Wall

Phototropism

5.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The term used to define a cell that has a nucleus containing DNA.

Prokaryote

Eukaryote

Autotroph

Homeostasis

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A force exerted outward on a cell wall by the water contained on a cell.

Turgor Pressure

Adaptation

Cell Wall

Photosynthesis

7.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The building up of an ecosystem after lava or glaciers have left nothing but rock.

Secondary Succession

Primary Succession

Natural Selection

Adaptation

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31 questions

The part of a cell that contains the chromosomes (wound up DNA) in Eukaryotic cells.

The genetic code for all of your traits.

The organelle inside a plant cell that converts sunlight into energy.

The part of a plant cell that is rigid & permeable.

The term used to define a cell that has a nucleus containing DNA.

A force exerted outward on a cell wall by the water contained on a cell.

The building up of an ecosystem after lava or glaciers have left nothing but rock.

A cell without a nucleus.

Organisms who receive energy from dead or decaying matter.

Rebuilding an ecosystem after a catastrophic event has occurred and soil is present.

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