NEW
Font size
Worksheets7th Grade Life Science End Of The Year Final Review
Total questions: 45
Worksheet time: 2hrs 30mins
The cell theory is made up of three components. Which of the following statements is a component of the cell theory? SC.6.L.14.2
Cells are composed of atoms and molecules
All cells come from pre-existing cells.
All cells are made up of units called organelles.
Cells reproduce through spontaneous generation.
The word equation below summarizes a process that organisms use to obtain energy from food.
Glucose + Oxygen › Carbon dioxide + Water + Energy
What process is represented by the equation? SC.8.L.18.2
cellular respiration
decomposition
photosynthesis
transpiration
The illustration shows that sexual reproduction involving two parent pea plants resulted in the production of four offspring.
Which of the following statements best describes heredity in organisms that reproduce sexually? SC.7.L.16.1
All four offspring received all of their genetic information only from Parent 1 and are therefore identical to that parent
All four offspring received all of their genetic information only from Parent 2 and are therefore identical to that parent
All four offspring are genetically unique and did not receive any of their genetic information from either parent.
All four offspring are genetically unique and received some of its genetic information from each parent.
Plant cells contain chlorophyll. What is the role of chlorophyll in plant cells? SC.8.L.18.1
It gives off oxygen during respiration
It absorbs light energy during photosynthesis
it aids in cell division
it aids in pollination
Dr. Brown performed several repetitions of an experiment using fruit flies. He developed a theory and then published a paper in a distinguished scientific journal. Which of the following will most likely happen next? SC.7.N.1.2
Other scientists will try to replicate his work.
Other scientists will try to take credit for his work.
Other scientists will accept Dr. Brown's theory as fact.
Dr. Brown's paper will be published in a periodical read by the general public.
Different types of variables affect the results of an experiment. Which of the following statements best describes an outcome variable (dependent variable)? SC.7.N.1.4
An outcome variable (dependent variable) is never affected by the manipulation of a test variable (independent variable).
An outcome variable (dependent variable) is part of the control group in an experiment because it does not change.
An outcome variable (dependent variable) is intentionally held constant throughout an experiment.
An outcome variable (dependent variable) is a variable that might be affected by the manipulation of a test variable (independent variable).
Marc wants to use the picture above to show how carbon cycles between organisms and the environment. Which parts of the carbon cycle is shown in the illustration? SC.8.L.18.3
cellular respiration and decomposition
combustion and decomposition
decomposition and photosynthesis
photosynthesis and cellular respiration
Living systems follow the law of conservation of energy. The diagram below shows how energy stored in food moves among the organisms in a mangrove ecosystem. In what form is the energy that is stored in food? SC.8.L.18.4
heat
light
chemical
mechanical
Cells are the basic units of life. Which statement is true about all of the cells that make up any organism?SC.6.L.14.3
All the cells have the same internal structures.
All the cells form tissues that make up organs.
All the cells undergo similar processes to maintain homeostasis.
All the cells carry out the process of photosynthesis to make nutrients.
The diagram shows the movement of material from the inside of a cell to the outside of the cell through a protein channel, as indicated by arrows.
Which cell part is the barrier between the inside of the cell and the environment outside the cell? SC.6.L.14.4
cell wall
cell membrane
mitochondria
endoplasmic reticulum
A fossil is the remains or traces of organisms that have lived in the past. Which statement is true about fossils? SC.7.L.15.1
A fossil never includes a complete organism.
A fossil shows the evolution of an entire species.
Much of the evidence for evolution comes from fossils.
Fossils have provided a complete history of Earth's life forms.
Refer to the illustration that shows one of the human body systems. What is the function of this system? SC.6.L.14.5
provide nutrients to the body
eliminate wastes from the body
transport substances to all cells of the body
prevent infections from spreading through the body
Organisms are classified according to shared characteristics. This process has led to the development of a classification system that has various levels of organization. Which of the following levels of classification is of the lowest heirarchy? SC.6.L.15.1
domain
class
family
species
The illustration shows part of one of the systems in the human body. What is the function of this body system? SC.6.L.14.5
breakdown and absorption of nutrients
production of offspring
structure, support, and movement
transport of oxygen and carbon dioxide between the lungs and the rest of the body
The brain is a structure that controls and coordinates the activities of an organism. Which of the following best represents the levels of organization that forms the brain? SC.6.L.14.1
organism > organ system > organ > molecules > atoms
tissues > cells > atoms > organ > organ system
molecules > organ > tissues > cells > organism
atoms > molecules > cells > tissues > organ
The chart shows the classification of a housefly. Which of the following is the least specific classification for this insect? SC.6.L.15.1
Animalia
Arthropoda
Insecta
Musca
A population of deer lives in a warm climate. Some of the deer have thicker fur than others. Construction of a road surrounded by tall sound barriers causes the deer population to be divided into two separate groups. Many of the deer separated from the original environment move into a mountain area that has a colder climate. What will eventually happen to the deer population that lives in the mountains? SC.7.L.15.2
After many generations, all the deer in the mountain population will have thin fur.
After many generations, most of the deer in the mountain population will have thick fur.
The deer that move into the mountains will likely die off from exposure to the cold and go extinct.
The deer population will migrate back to the warmer climate to join the original population.
Some weed species have developed an adaptation that makes them resistant to pesticides. How does the theory of evolution by natural selection help to explain this ability? SC.7.L.15.2
Due to genetic variations, some weeds in the population had the ability to resist pesticides, and passed this trait to their offspring.
The weeds developed pesticide-resistant variations because their survival depended on it.
As the weeds evolved, natural selection resulted in an unfavorable variation in a population.
In any population of weeds, some weeds will be naturally immune to all kinds of pesticides.
Extinction is the dying out of a species. What can lead to the extinction of a species if the environment changes? SC.7.L.15.3
having traits that enable the species to adapt to the changed environment
an increase in the reproductive rate within the species
a lack of adaptations in the species that help individuals survive and reproduce in the changed environment
the presence of genetic variations among the individuals of the species
Every organism requires a set of instructions that specifies its traits. Which statement best describes the hereditary information in a cell? SC.7.L.16.1
Genes are located on the chromosomes.
Each chromosome contains a single gene.
A gene, but not a chromosome, is made of DNA.
A gene, but not DNA, is passed on to the next generation.
The diagram shows steps in one type of cell division. What is the term for the type of cell division shown in the diagram? SC.7.L.16.3
duplication
meiosis
mitosis
mutation
The diagram shows a food web. The organisms in a food web can be classified based on how they get the energy they need. Which organism in this food web is a primary consumer? SC.7.L.17.1
mouse
snake
fox
hawk
Many factors limit the growth of populations in ecosystems. Human activity can cause changes in ecosystems and can affect the limiting factors that act on populations. Which of the following factors that can limit population growth has been most affected by humans? SC.7.L.17.3
predator-prey relationships
parasitism
drought and flooding
size of natural habitats
For a particular trait, the allele F is dominant over the allele f. The Punnett square shows the genetic cross of two parents, each with the genotype Ff. Which box in this Punnett square would contain two dominant alleles? SC.7.L.16.2
1
2
3
4
The graph shows the populations of two species from January 2010 to June 2011. One species is native to the ecosystem, while the other is a new species that was recently introduced into the ecosystem. Which interaction between the two species would explain the trends in the size of their populations? SC.7.L.17.2, SC.7.N.1.1
The two species form a mutualistic relationship.
The two species form a competitive relationship.
The new species is a host and the native species is its parasite.
The new species is a prey and the native species is its predator.
A class collected daily humidity data from the same location in the schoolyard for one month to see how the humidity level changed over time.
Which of these was the independent variable in the experiment? SC.7.N.1.1
the humidity level
the amount of time that has passed
the number of students involved
the location from which the students collected the data
A group of students is investigating what kind of bird feeders bluebirds prefer. The students have several similar bird feeders set up in an open field with the same type and amount of bird seed in each. The feeders have the following shapes and colors:
3 red round feeders
3 red square feeders
3 blue round feeders
3 blue square feeders
What kind of scientific investigation are the students using? SC.7.N.1.3
simulation
data interpretation
scientific experiment
theoretical prediction
A scientist repeated trials of an experiment ten times.
What is the most likely reason that the scientist repeat the experiment so many times? SC.7.N.1.2
to make sure the results are consistent
to practice an experimental procedure
to prove her results fir a current theory
to make the results fit her proposed hypothesis
The diagram shows two types of models of the human heart. The model on the left is made of plastic. The model on the right is a drawing. Which of these is a limitation of the drawing but NOT of the plastic model? SC.7.N.3.2
It does not show as many different parts of the heart.
It does not indicate the right and left sides of the heart.
It does not show the shape and appearance of the heart.
It does not show the structure of the heart in three dimensions.
Scientists study changes in beaches, marshes, and other coastal areas. The movement of water causes coastal areas to change.
Which of these is NOT a source of evidence for studying coastal areas? SC.7.N.1.6
data on waves and tides
information on the size and shape of beaches
maps of hurricane paths in the past 10 years
surveys that ask people their opinions of beaches
Many scientists from around the world have conducted research and published papers related to the estimated number of genes in the human body. The estimates have ranged from 20,000 all the way up to 150,000. Currently, most scientists agree on a number of genes somewhere around 25,000. Which of the following conclusions can be drawn based on this information? SC.7.N.1.7
The number of genes can vary widely from individual to individual.
Human genes are of interest to cell biologists but not to those in other scientific disciplines.
Human genes are more difficult to count than those from other organisms and results vary widely.
The number of genes has been a subject of debate and its confirmation is important to the scientific community.
There have been several ideas over time about how plants and animals receive traits. Lamarck thought that living things could change their traits based on the environment. Gregor Mendel noticed that plants had the basic traits of their parents regardless of the environment. Mendel's experiments added to the knowledge of heredity by verifying that specific traits are contributed from each parent and are inherited in each generation.
Which of these statements best explains how Mendel’s laws of heredity were confirmed by the scientific community? SC.7.N.2.1
Scientists revised the older theory to include Mendel’s laws, because it better matched their observations and data.
Scientists tested each theory and found both were about the same in matching their observations and data.
Scientists decided Lamarck’s theory was too old and replaced it with the new theory.
Scientists accepted Mendel’s theory because he was more famous than Lamarck.
Which of these describes a theory and NOT a law? SC.7.N.3.1
can be measured or expressed in mathematical terms
similar to a rule, since it is not normally modified or changed
is a broad explanation of a natural event which may be modified with new evidence
is typically a statement that describes specific relationships under specific conditions
The diagrams show an organism in its original size (1X), magnified three times (3X), and magnified 300 times (300X). Which concept is best illustrated by the set of diagrams? SC.6.L.14.2
cells are the building blocks of organisms
organisms go through cyclical phases
plants make food by photosynthesis
reproduction is a microscopic process
The clownfish and sea anemone interact in a marine ecosystem in which both organisms benefit. Which of the interactions listed best identifies the clownfish and sea anemone relationship? SC.7.L.17.2
parasitism
mutualism
competition
commensalism
The image shows a food web in a Florida ecosystem, with arrows pointing to the consumer. A new organism moves into the ecosystem. Its major food source is the pine borer. Which animals in the food web will form a competitive relationship with the new organism? SC.7.L.17.2
fax and hawk
kinglet and fox
salamander and kinglet
squirrel and salamander
Which statement about the carbon cycle is most true? SC.8.L.18.4
Energy is destroyed when organic matter decays.
The total mass of carbon on Earth is always increasing.
Carbon is lost from the cycle when it enters the atmosphere.
Carbon changes form, but the total amount on Earth remains the same.
A paleontologist identifies several fossils under a riverbed. She brings in a chemist from her
team to help identify the age of the fossils.
Which chemical method would be most useful for dating the fossils? SC.7.N.1.5
measuring the pH of the fossil fragments
testing the reactivity of the fossil fragments
calculating the radioactive decay of carbon in the fossils
removing the material that surrounds fossils with an acid
A group of paleontologists has discovered the fossil of a previously unknown animal.
How can they use information about the fossil to properly determine its closest evolutionary
relatives? SC.7.N.1.5
They can compare the DNA found in the fossil to that found in other organisms.
They can compare the physical structure of the fossil to those of other known organisms.
They can compare the location of the fossil to the location of the fossils of other organisms.
They can compare the location of the fossil to the location of the fossils of other organisms.
Organs are organized to maintain homeostasis in organisms. Into which of the following are organs arranged? SC.6.L.14.1
organelles
organ systems
specialized cells
tissues
Which statement is one reason that plant cells have cell walls while animal cells do not? SC.6.L.14.4
Plant cell walls store food that plants make; animal cells do not need to store food.
Plant cell walls protect the nucleus; in animal cells, the nucleus is protected by the cell membrane.
Plant cell walls store water to keep the plant upright; animal cells do not need to help the animal stay upright.
Plant cell walls give the plant a more rigid structure so they can grow upward; animal cells need to be more flexible.
The roundworm is the largest infectious agent to affect humans: they can reach 35 centimeters(cm) in length. Humans become infected when they consume roundworm eggs, which hatch, break through the intestinal wall, and then enter the bloodstream. They feed off of intestinal fluid, tissue, blood, and mucus. How are roundworms classified? SC.6.L.14.6
bacteria
fungi
parasite
virus
Janelle set up a mini ecosystem in an aquarium. At the base of the ecosystem's food web are photosynthetic plants. She then carried out an investigation using her mini ecosystem. She kept the ecosystem from receiving any light for 2 weeks. What do you predict Janelle's results will be? SC.7.L.17.1
All of the organisms in the food web will be affected.
The producers in the food web will die, but the consumers will be unaffected.
The consumers in the food web will die, but the producers will grow at an increased rate.
None of the organisms in the food web will be affected.
One limiting factor in an ecosystem is based on predation. The graph below shows how the numbers wolves and rabbits in a forest changed over time. Does the graph support the idea that wolves and rabbits have a predator-prey relationship? SC.7.L.17.3
no, because there are more rabbits than wolves
no, because the wolf population is too large to be fed by the rabbits and because the changes in rabbit population are more drastic than the changes in wolf population
yes, because the rabbit population increases when there are fewer wolves
yes, because the changes in rabbit population are more drastic than the changes in wolf population
Scientists state that species living today are descended from similar, but different, species from the past. Which scientific theory explains this concept? SC.7.N.3.1
the cell theory
the atomic theory
the theory of evolution
the theory of plate tectonics
