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A #science Quiz to review for #SBA 7th grade Test.
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1
An adaptation is:
the way an animal behaves.
a theory about how organisms change over time.
an inherited trait that helps an organism survive.
a newly discovered species.
2
Populations grow in size when:
number of births is greater than number of deaths.
number of births is equal to number of deaths.
the emigration and immigration rates are the same.
number of deaths is greater than number of births.
3
during mitosis:
body cells divide once and produce a new organism
body cells divide twice and produce a new organism
body cells divide 3 times in a row to replace old cells
body cells divide once to replace old and damaged cells
4
consumers get their energy from:
decomposing rotting material
exercising
the sun
eating other organisms
5
each rung of a DNA ladder consists of:
a twisted ladder of sugar and phosphate molecules
base pairs with A pairing G & C pairing A
base pairs in random combinations of A, C, T, and G
base pairs with A pairing T & C pairing G
6
When organisms with favorable adaptations survive and reproduce at a higher rate than others:
natural selection occurs.
over-reproduction occurs.
those organisms become extinct.
those organisms move to another area.
7
a gene is:
a unit that determines traits
a recessive allele
a dominant allele
the same thing as an allele
8
DNA is:
a homologous structure.
a common ancestor.
the hereditary material of living organisms.
the same thing as a gene.
9
polygenic traits are traits that:
are determined by only one gene
are determined by more than one gene
cannot be predicted with a punnett square
result in genetic disorders
10
genetic disorders are:
abnormal conditions that an organism inherits from parents
a change in the hereditary material of an organism
the process of DNA replication
the structure of DNA
11
A population's growth is limited by all of the following except:
temperature
nutrients
energy
space
12
the the purpose of photosynthesis is:
allowing humans to have necessary water
converting oxygen to carbon dioxide
converting the sun's energy into chemical energy
helping a plant turn green
13
Mass Extinctions are:
periods of rapidly changing climate
a single species becoming extinct
an evolutionary relationship
periods of large-scale extinction
14
probability is:
the mathematical chance that an event will occur
never used in mathematics
never used in science
the mathematical formula for calculating percent
15
the correct order of the phases of the cell cycle is:
cytokinesis, interphase, mitosis
interphase, cytokinesis, mitosis
cytokinesis, mitosis, interphase
interphase, mitosis, cytokinesis
16
A punnett square:
predicts the gender of offspring
shows the phenotypes of offspring
predicts the genotypes of parents
shows all the possible combinations of alleles from parents
17
Food webs are:
overlapping food chains
overlapping ecosystems
the same as energy pyramids
the same as a food chain
18
The order of steps in the water cycle is:
evaporation, condensation, precipitation
precipitation, rainfall, condensation
precipitation, condensation, evaporation
evaporation, cloud formation, condensation
19
the correct order of levels of organization in living things is:
cell, tissue, organ system, organism, organ
tissue, organ, cell, organ system, organism
cell, tissue, organ, organ system, organism
organism, organ, organ system, tissue, cell
20
Organisms of the same species:
are not genetically similar & can produce offspring together
are not genetically similar/can't produce offspring together
are genetically similar but can't produce offspring together
are genetically similar and can produce offspring together
21
Gregor Mendel is known as
the most famous scientist ever
an alien from Mars
the father of biology
the father of genetics
22
cell division is necessary for:
reproduction and growth
growth only
reproduction only
reproduction, growth, and maintenance of body functions
23
alleles are:
strands of DNA
possible combinations of genes from parents
the order of bases in a segment of DNA
different forms of a gene
24
a cell is:
smaller than a molecule but bigger than a tissue
bigger than an organ but smaller than an organism
the largest unit of a living thing
the smallest unit of a living thing
25
An organism's scientific name comes from:
its genus and species
its family
its order and class
its taxonomy
26
compounds are:
a substance containing 2 or more elements chemically joined
a mixture of particles
a mixture of elements and particles
the smallest particle of an element
27
decomposers are important because:
they balance food webs
they produce energy for consumers
they return nutrients to the soil to be recycled
they keep carbon and oxygen cycling in the atmosphere
28
Extinction happens when:
all members of a species die off completely.
there are very few members of a species left.
a species is thriving.
a species moves to a new habitat.
29
The first source of energy in ecosystems is:
sun
rain
soil
clouds
30
The fossil record provides:
a historical sequence of life on Earth.
information about every species that ever existed on Earth.
DNA base sequences.
a remnant of an organism from the past.
31
You can predict the possible genotypes and phenotypes of offspring if:
you know the genotypes of the parents
you know which form is dominant and which is recessive
you know only the phenotypes of the parents
you create a punnett square
32
during osmosis, water molecules move:
from areas of high concentration to low concentration
from the inside of a cell to the outside of a cell
from areas of low concentration to high concentration
from the outside of a cell to the inside of a cell
33
the carbon-oxygen cycle explains:
the process of photosynthesis
the movement of oxygen and carbon atoms
the way carbon and oxygen atoms behave
how carbon and oxygen are cycled through ecosystems
34
osmosis is:
the same as active transport
movement of water molecules across a semi-permeable membrane
movement of water molecules around the outside of a cell
movement of any molecule across the cell membrane
35
atoms are:
the smallest particle of an element
the simplest form of matter
combinations of different molecules
groups of atoms chemically joined together
36
An experimental variable:
is the variable you change on purpose in an experiment
is the variable that's affected by changing another variable
is the variable you keep the same in an experiment
is the same as the control variable(s)
37
the variety of alleles in a population is called:
genetic abnormality
genetic variation
genetic testing
the study of genetics
38
The proper order of the steps in the scientific method is:
Question, Observation, Hypothesis, Experiment, Conclusion
Experiment, Conclusion, Hypothesis, Observation, Question
Question, Experiment, Observation, Hypothesis, Conclusion,
Observation, Question, Hypothesis, Experiment, Conclusion
39
living organisms contain mostly the elements
hydrogen, helium, oxygen
oxygen, glucose, hydrogen
sulfur, oxygen, lead
carbon, hydrogen, oxygen
40
The smallest unit of ecological organization is
community
ecosystem
population
organism
41
people who have the genetic disorder "sickle cell anemia"
have abnormally shaped white blood cells
have no red blood cells
have abnormally shaped red blood cells
have abnormally shaped platelets
42
energy pyramids show:
the difference between producers and consumers
who eats whom in an ecosystem
how energy moves from one organism to another in ecosystems
how each member of an ecosystem gets its food
43
Competition between 2 species happens when:
an animal hibernates during the winter.
two species live closely together and at least one benefits.
one animal hunts another for food.
two or more species depend on the same limited source.
44
To which class of levers does the human forearm belong?
Fifth Class
Third Class
First Class
Fourth Class
45
homeostasis is:
maintaining a life-supporting internal environment
the process of cellular respiration
the feedback control systems of the body
cellular reproduction
46
the kingdoms of living things are:
Animalia, Plantae, Bacteria, Fungi, Protista
Animalia, Plantae, Species, Family, Order
Animalia, Class, Family, Order , Genus
Animalia, Plantae, Bacteria, Felis, Domesticus
47
elements are:
the same thing as cells
the same as molecules
the simplest form of matter
two or more elements joined together
48
during meiosis:
sex cells divide once and produce 4 haploid cells
sex cells divide twice and produce 4 diploid cells
sex cells divide once and produce 2 diploid cells
sex cells divide twice and produce 4 haploid cells
49
A place where an organism lives that provides the things it needs is called:
an ecosystem
population density
emigration
its habitat
50
The oldest fossils are found:
in the sand on the beach.
in the deepest layers of rock.
in the upper-most layers of rock.
in the middle layers of rock.
51
Evolution is:
a way of organizing the different species on Earth.
the study of rocks and fossils
a theory about the process of how organisms change over time
a place where an organism lives
52
All of the following are lines of evidence for evolutionary relationships
except:
DNA analysis.
the same color of fur.
the fossil record.
homologous structures/comparative anatomy.
53
the difference between active transport and passive transport is:
passive transport does not require energy but active does
neither require energy
active transport does not require energy but passive does
both require energy
54
in
complete dominance:
both traits show up at the same time
neither trait shows up
the traits blend together to produce a new trait
one trait is always dominant over the other
55
the cell cycle is:
the time a cell spends in mitosis
the time a cell spends in interphase
the period of time from one cell division to the next
the time a cell spends in cytokinesis
56
The compounds in living things are:
carbohydrates, lipids, sugars, starches
glucose, carbohydrates, cells, tissues
carbohydrates, lipids, fats, proteins
carbohydrates, lipids, proteins, nucleic acids
57
homologous pairs
are separated after fertilization
always stay together
are separated during mitosis
are separated during meiosis
58
biotic factors are:
the non-living parts of an ecosystem
how an organism survives
the living parts of an ecosystem
interactions between species
59
Producers get their energy from:
the sun
nutrients
other organisms
exercise
60
photosynthesis and cellular respiration are related because
products of photosynthesis are reactants in cellular resp.
photosynthesis makes cellular respiration happen
animals and plants can both photosynthesize
they are the same thing
61
all
living things do all of the following
except
grow, develop, and respond
reproduce
photosynthesize
use energy
62
Random mutations in genes:
produce a variety of traits in a population
cause only favorable traits
cause only unfavorable traits
are adapatations
63
most of the energy in an ecosystem is lost as ______ as it moves from level to level (trophic)
unusable heat
decomposing material
evaporation
waste
64
an organism's traits are determined by:
only heredity
neither the environment nor heredity
both the environment and heredity
only the environment
65
The steps in species formation are:
isolation, adaptation, species formation.
species formation, adaptation, isolation.
isolation, species formation, adaptation.
adaptation, species formation, isolation.
66
an embryo is:
a body cell
a specialized cell
an organism in the earliest stages of development
a sex cell
67
towards the end of "interphase":
the cell grows and develops
the DNA doubles
the nucleus splits into 2 new nuclei
the cell membrane pinches off to form 2 daughter cells
68
A population is:
all of the Earth's biomes
all of the members of the same species living in an area
all of the cats, dogs, and humans in an area
the area in which an organism lives that provides its needs
