Answers FL-2002070-MJ Comprehensive Science 2Unit Test

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Which scenario would result in a positive population growth?Use this formula: population growth = (birth rate + immigration) – (death rate + emigration)

30 individuals emigrate, 30 individuals die, 30 individuals are born, 0 individuals immigrate

22 individuals emigrate, 10 individuals are born, 12 individuals immigrate, 0 individuals die

15 individuals immigrate, 9 individuals emigrate, 6 individuals are born, 0 individuals die

18 individuals immigrate, 20 individuals die, 1 individual is born, 0 individuals emigrate

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Which describes a relationship in which one organism kills and eats another organism?

mutualism

predation

competition

commensalism

The diagram illustrates radioactive decay.

Structure 1 is an unstable atom that turns into structure 2, a new atom.

Structure 1 is a stable element that breaks down into structure 2, an unstable element.

Structure 1 is a radioactive element that loses particles to create structure 2, released energy.

Structure 1 is a radioactive atom that decays into structure 2, half of the original unstable element.

What did Darwin think about Earth and life while he was forming his theory of evolution?

Earth changes slowly over time, so populations might also.

Earth might cause rapid changes in the traits of individuals.

Earth cannot sustain large populations, so many animals become extinct.

Earth does not change much, so populations must adapt to survive.

The Chesapeake Bay is an important natural resource. Over the years, the number of oysters in the bay has declined dramatically, largely because of fishers who catch them and sell them as food. This has affected many other organisms that depend on oysters.

eutrophication

non-sustainable harvesting

nonnative species introduction

pollution

Which phrase describes faults?

cause gaps in the geologic record

cause rocks to break and move

are older than surrounding rocks

are igneous rocks that form beneath Earth’s surface

Which best describes the relationship between population size, carrying capacity, and limiting factors?

The size of a population usually stays high due to its carrying capacity and limiting factors.

The size of a population usually stays near its limiting factors due to carrying capacity.

The size of a population usually stays near its carrying capacity due to limiting factors.

The size of a population usually stays low due to its carrying capacity and limiting factors.

Sydney drew a flow chart to illustrate the nitrogen cycle.

X: Producers undergo photosynthesis.Y: Nitrogen compounds are released into the air.

X: Nitrogen compounds are released into the air.Y: Producers undergo photosynthesis.

X: Free nitrogen is in the atmosphere.Y: Producers absorb nitrogen compounds through their roots.

X: Producers absorb nitrogen compounds through their roots.Y: Free nitrogen is in the atmosphere.

Which best explains why males have a greater probability of being color blind than females?

Males only have to inherit the allele on the Y chromosome to be color blind.

Males only have to inherit the color blindness allele once to show the trait.

Males have to inherit two copies of the color blindness allele to show the trait.

Males have to inherit the allele on two X chromosomes to be color blind.

Brown eye color is a dominant trait and blue eye color is a recessive trait.What typically happens when someone inherits one allele for brown eyes and one for blue eyes?

The person has brown eyes, and brown eye color remains a dominant trait.

The person has blue eyes, but brown eye color remains a dominant trait.

The person has brown eyes, but blue eye color becomes a dominant trait.

The person has blue eyes, and blue eye color becomes a dominant trait.

Which practice has decreased the number of disease-carrying rats around homes and businesses?

refrigeration

garbage collection

lichen measuring

water treatment

Which medical conditions are associated with large amounts of fat and sugar in your diet? Select three options.diabetescolor blindnessheart diseaseobesitysickle cell anemia

diabetes

color blindness

heart disease

obesity

sickle cell anemia

The diagram illustrates the water cycle.

Some illnesses and harmful infections are caused by bacteria. These bacteria grow in the human body and often make people sick with symptoms like coughing, sneezing, and fever. These illnesses are not related to any genetic mutations or other problems with DNA.

Gene therapy reduces symptoms but never cures illnesses.

Gene therapy does not work on most people.

Gene therapy only focuses on replacing mutated genes.

Gene therapy is too long a process.

Which sequence furthers scientific knowledge?

Hypotheses generate a scientific question, leading to observations, which can be tested through an experiment.

Observations generate a scientific question, leading to a hypothesis, which can be tested through an experiment.

Hypotheses generate a scientific experiment, leading to observations, which can be tested through a question.

Observations generate a scientific experiment, leading to a hypothesis, which can be tested through a question.

An adult panda bear must eat at least 30 pounds of bamboo in a day. There are 12 adult pandas living in part of a bamboo forest.How many pounds of bamboo, at minimum, must be available each day in order to support the population of pandas?

348

360

In a given year, which would result in the greatest increase in population size?

high birth rate, high death rate, high immigration, high emigration

high birth rate, zero death rate, high immigration, zero emigration

zero birth rate, low death rate, zero immigration, low emigration

zero birth rate, zero death rate, low immigration, high emigration

Which statement describes an advantage of asexual reproduction?

Asexual reproduction results in variations in DNA.

Asexual reproduction causes less competition for resources.

Asexual reproduction is faster than sexual reproduction.

Asexual reproduction requires more energy than sexual reproduction.

The producer in an energy pyramid contains about 1,000 kcal of energy.About how much of this energy is used by the producer or lost as heat to the environment?

10 kcal

90 kcal

100 kcal

900 kcal

Construction sites move lots of sediment. Which environmental factors are most likely affected by construction sites?

air quality and water quality

air quality and trash collection

trash collection and refrigeration

refrigeration and water quality

The tropical pitcher plant is a unique plant that obtains its nutrition by digesting insects. The plant traps insects in its pitcher-shaped leaves and dissolves them as part of the digestion process. Tropical pitcher plants grow in warm, moist places in which the soil is poor in nutrients. Because of their feeding habits, pitcher plants are able to control the insect populations in the areas in which they live.

controlling insect populations

sharing a habitat with insects

having pitcher-shaped leaves

being a unique type of plant

Which characteristic of potassium makes it useful for dating rocks?

It has a long half-life.

It decays at an unknown rate.

It produces lead as it breaks down.

It can be used to date all types of rock.

Which best summarizes the results of Mendel’s pea plant experiments?

One parent passes traits to offspring in a random process.

Both parents pass traits to offspring in a random process.

Both parents pass traits to offspring in a fairly predictable pattern.

One parent passes traits to offspring in a fairly predictable pattern.

Which is the best example of parasitism?

A pearlfish hides within a sea cucumber, and the sea cucumber is not affected.

A sparrow catches and eats a painted lady butterfly.

A tapeworm lives inside the intestines of a pig, robbing the pig of nutrients it needs.

An ant eats nectar produced by a flower, and the flower is not harmed.

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