What is one way humans are trying to positively impact the ocean?

havrvesting oil and natrual gas

transporting goods in ocean vessels

Because of the increase in rainfall in an ecosystem one year, the mosquito population increases. The next year, the amount of rainfall returns to normal levels. How will these changes in rainfall totals affect the bird population in the ecosystem that feeds on the mosquitoes?

It will cause the bird population to increase and then decrease.

It will cause the bird population to decrease.

It will cause the bird population to increase.

It will have no effect on the bird population.

(7.10B) One indicator that biodiversity in an ecosystem is decreasing is ...

a decrease in the number of different species in the area.

a decrease in annual rainfall and temperature.

a decrease in the number of tourists visiting the area.

fewer sightings of coyotes and bobcats.

Which of the following describes a producer/consumer relationship in a marine environment?

Green plants in the ocean are food for many fish.

Sea otters catch and eat clams and oysters.

Plants compete for space and sunlight in a garden.

Turtles depend on ocean currents to travel.Select

Which of the following describes a negative consequence of commercial fishing?

ocean food webs become unbalanced

increased dissolved oxygen concentration

fishing vessels cause water to warm up

The northern elephant seal was almost hunted to extinction in the 1800s. By the late 1890s, approximately one hundred seals were left, reducing the gene pool of the population. What will be the consequence of this reduction ?

The elephant seals will be more vulnerable to environmental change.

Competition within the population will increase.

The surviving elephant seals will be better able to adapt.

Inbreeding will be less frequent among the remaining population.

Which of the following best describes a parasite/host relationship in the marine ecosystem?

Lice attach to whales and cause skin damage.

Fish consume zooplankton for food energy.

Phytoplankton produce their own food energy.

Seagulls swoop down and catch a fish to eat.

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

Microscopic algae and white suckers

Small invertebrates and amphipods

(7.11C) Some dairy farmers want to increase the amount of milk produced by their cows. How can the farmers use selective breeding to increase milk production ?

By choosing cows that are high milk producers

By increasing the age of the cows that are bred

By limiting the number of offspring per cow

By choosing cows that can produce milk after eating the most food

(7.11C) A few years ago the population of male blue moon butterflies on the island of Samoa declined. One hypothesis for the decline of the male butterflies is that a parasite infected the cells of female butterflies. The parasite was passed to offspring through the females’ eggs and killed the male butterfly embryos. At one point during the decline, nearly all the butterflies in the population were females, but after five years the number of males in the population increased significantly. Which explanation most likely accounts for the increase in the number of male butterflies in the five years after the initial parasite problem?

Male butterflies in the population that survived had a gene that made them resistant to the parasite, and they passed the gene on to their offspring.

Male butterflies in the population that survived were able to prey on the parasites living in the females’ egg cells.

Female butterflies in the population that survived had a genetic adaptation that allowed them to transform into male butterflies.

Female butterflies in the population that survived were able to protect the male eggs from the parasite and provide extra care for the male offspring.

(7.10B) Students in a science class visited four local ecosystems. The students observed the species present in each ecosystem and recorded their observations in the table. Based on these observations, which ecosystem is likely to be the least sustainable ?

Ecosystem 1, because it has the fewest species

Ecosystem 2, because it includes both aquatic and terrestrial species

Ecosystem 3, because it has few predators

Ecosystem 4, because it supports many animals

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.

A coastal area that once supported a thriving fishing industry is overfished. The number of species found living in the marine ecosystem decreases. Which of these activities is most likely to increase the natural biodiversity in the area?

Building artificial reefs and limiting fishing activity

Introducing non-native species to fill unoccupied habitats and banning fishing

Building artificial reefs and increasing fishing activity

Eliminating non-native species and encouraging fishing for large predatory fish

(7.11C) When Charles Darwin visited the Galápagos Islands in the 1800s, he observed many types of organisms that were similar but lived on different islands. The four species of mockingbirds found on the Galápagos Islands are shown below. Each species lives on a different island. These species are very similar, but the Hood mockingbird has a longer beak than the other three species. Which of the following best explains this difference?

The Hood mockingbird’s longer beak is an adaptation to the food available in the bird’s habitat.

The Hood mockingbird needs a longer beak for defense against predators.

The Hood mockingbird originated from a different type of bird than the other species.

The Hood mockingbird’s beak stretched to reach its food, and the longer beak was passed down to its offspring.

(7.12F) In 1838 botanist Matthias Schleiden determined that all plants are composed of cells. In 1839 anatomist Theodor Schwann proposed that all animals are composed of cells. In 1855 biologist Rudolph Virchow added to Schleiden’s and Schwann’s observations and proposed that all living things are composed of cells. Which statement is also part of Virchow’s cell theory?

All cells arise from pre-existing cells.

All cells are capable of photosynthesis.

All cells can develop into any other type of cell.

(7.14B) The hydra is a very small, simple animal that lives in water. Hydras reproduce asexually by budding, a process in which a bud breaks off an adult hydra and floats away. Which of the following best describes a hydra bud?

A hydra bud is genetically identical to the parent hydra.

A hydra bud contains genetic material from its two parents.

A hydra bud has different mutations than the parent hydra.

A hydra bud has half as much genetic material as the parent hydra.

(6.12D) Which list of characteristics describes organisms classified as animals ?

Multicellular, eukaryotic, heterotrophic

Unicellular, prokaryotic, autotrophic

Unicellular, eukaryotic, heterotrophic

Multicellular, eukaryotic, autotrophic

(8.01B) Which of these human activities is most likely to cause the excessive growth of phytoplankton in 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

(7.14C) Three cousins have a similar appearance but different face shapes. Which of these cell components are most involved in determining the basic shape of each girl’s face?

Genes, chromosomes, and nucleus

Cytoplasm, chloroplasts, and genes

Vacuoles, nucleus, and chromosomes

Chromosomes, chloroplasts, and vacuoles

(7.14B) Certain species of whiptail lizards have only female individuals and no males. These lizards reproduce asexually. What is one disadvantage of asexual reproduction for these lizards?

All the members of a population are genetically very similar and less able to survive environmental changes.

A new population can be established by a single individual in a relatively short period of time.

They are smaller than lizards that reproduce sexually.

They are more likely to develop a variety of tail lengths.

(7.10C) Both primary and secondary succession begin with pioneer species that —

modify the area and allow larger and more complex organisms to appear.

change the area and make it safer from predatory organisms.

invade the area so that new organisms cannot be established.

use up all the existing resources and prevent establishment of non-native organisms.

(7.14B) A group of students prepared a table listing the types of reproduction that occur in several organisms. Based on this information, which of the organisms can produce offspring that are genetically identical to the parent organism?

amoebas, yeasts, hydras, and ferns only

cats, hydras, frogs, and ferns only

(7.12F) In the 1800s two scientists, Theodor Schwann and Matthias Schleiden, studied different types of organisms. After many years of studying a great variety of organisms, they drew similar but independent conclusions about their observations. What statement was developed most directly from these conclusions and is part of the modern cell theory?

Living things are composed of cells.

The functions of living things occur in cells.

Cells exist only in multicellular organisms.

Cells contain hereditary information.

STAAR Science 8 - Cat 4 Practice

Authored by Barry Rose

Biology, Other Sciences

8th Grade

NGSS covered

Used 383+ times

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50 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

(7.12D) This organelle is a rigid outer layer that protects plant cells.

Cell Membrane

Cell Wall

Nucleus

Chloroplast

Tags

NGSS.MS-LS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

(7.12D) The _?_ holds the DNA and controls the functions of plant and animal cells.

nucleus

nuclear membrane

cytoplasm

chloroplasts

endoplasmic reticulum

Tags

NGSS.MS-LS1-2

NGSS.MS-LS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

(6.12D) Which kingdom is autotrophic, eukaryotic and reproduces sexually?

Bacteria

Fungi

Plantae

Protista

Animalia

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What term best describes the non-living things in an ecosystem.

biotic

abiotic

biodiversity

ecosystem

community

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

"Only those organisms best suited to a particular environment are likely to survive." This statement best describes ...

diapause.

selective breeding.

migration.

natural selection,

producers

Tags

NGSS.MS-LS4-4

NGSS.MS-LS4-2

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

(7.10B) In a desert ecosystem, snakes are predators that eat kangaroo rats. What affect would the sudden disappearance of snakes have on the ecosystem?

The population of kangaroo rats would stay the same because their food source did not increase.

The population of kangaroo rats would decrease because they would reproduce less.

The population of kangaroo rats would increase because their predators have disappeared.

The population of kangaroo rats would stay the same because their water supply is limited.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following would be an example of a parasitic relationship?

fleas living on dog and ingesting its blood

lady bugs eating aphids on a plant

lichen living on a tree for support

clown fish living in a sea anemone for protection

Tags

NGSS.MS-LS2-4

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STAAR Science 8 - Cat 4 Practice

(7.12D) This organelle is a rigid outer layer that protects plant cells.

(7.12D) The _?_ holds the DNA and controls the functions of plant and animal cells.

(6.12D) Which kingdom is autotrophic, eukaryotic and reproduces sexually?

What term best describes the non-living things in an ecosystem.

"Only those organisms best suited to a particular environment are likely to survive." This statement best describes ...

(7.10B) In a desert ecosystem, snakes are predators that eat kangaroo rats. What affect would the sudden disappearance of snakes have on the ecosystem?

Which of the following would be an example of a parasitic relationship?

What is one way humans are trying to positively impact the ocean?

Because of the increase in rainfall in an ecosystem one year, the mosquito population increases. The next year, the amount of rainfall returns to normal levels. How will these changes in rainfall totals affect the bird population in the ecosystem that feeds on the mosquitoes?

(7.10C) This diagram best illustrates ...

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