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WorksheetsSecond Semester Science Exam Review 2022 7th Grade
Total questions: 30
Worksheet time: 17mins
Which claim correctly describes a type of cell division?
Mitosis involves one cell division that produces four haploid cells.
Meiosis involves one cell division that produces two diploid cells.
Mitosis involves two cell divisions that produce two diploid cells.
Meiosis involves two cell divisions that produce four haploid cells
At one time, farmers had to spray insecticides on their fields to protect their crops from insects. Today, farmers can buy seeds that produce plants that are resistant to many insects. Which process contributed to the development of these seeds?
cloning
natural selection
genetic engineering
sexual reproduction
What is natural selection?
the process by which humans breed a species for certain traits
the process in which inherited traits of a population change over many generations
the process by which Charles Darwin noted the differences in finches while visiting the Galápagos Islands
the process by which individuals that are better adapted to their environment are more likely to survive and reproduce
Which of these lists correctly identifies all four bases in DNA?
adenine, thymine, guanine, cytosine
adenine, uracil, guanine, cytosine
adenine, thymine, uracil, cytosine
uracil, thymine, guanine, cytosine
Using the photograph above which is the source of energy for the snake?
toad
owl
beetle
green plants
When farmers want two desirable traits in cows, they often breed individuals that have those traits in the hopes that the offspring will have both desirable traits. What is this practice called?
variation
natural selection
adaptation
artificial selection
Which from the list is an abiotic factor?
algae
light
trout
reeds
Which of these claims correctly describes a mutation?
It is a change in the nucleotide base sequence of a DNA molecule.
It is a molecule that is present in all living cells and plays a role in protein production.
It is a subunit of a nucleic acid chain that consists of a sugar, a phosphate, and a base.
It is a molecule that is present in all living things and stores the information that determines inherited traits.
Which of these is the best definition of biotechnology?
the study of chemical processes in living things
the use and application of living things and biological processes
the application of engineering principles to solve medical problems
the study of how energy, motion, and other forces affect living things
The Florida panther is an endangered species. It eats mostly white-tailed deer, wild pigs, raccoons, and armadillos, but it may also eat other small mammals and birds. The Florida panther used to live in forests, prairies, and swamps over most of the southeastern United States. Now it lives only in the southern tip of Florida, south of the Caloosahatchee River. What is the most likely cause of the decline of the Florida panther population?
the unintentional introduction of a larger predator
the break-up of the panther’s natural habitat by human settlement
the weakening of species due to inbreeding
competition for territory between panthers
Which of the following choices gives the genotypes of the parents shown here?
BB and BB
BB and Bb
Bb and Bb
Bb and bb
Which of these terms best describes the structure of DNA?
tetra hedron
double helix
single strand
triple octagon
What is evolution?
a group of organisms that can mate to produce fertile offspring
the process in which inherited traits of a population change over many generations
the process by which individuals that are better adapted to their environment are more likely to survive and reproduce
a trait that allows organisms in a population to better survive and reproduce in their environment
Which of these claims best describes what Charles Darwin observed on the Galápagos Islands?
The finches on the islands ate seeds and nuts but no insects.
The finches on the islands were the same as the finches in Ecuador.
The finch population on each island was unique.
The finches could produce offspring only with finches from other islands.
According to the evidence in the food web, which organisms are the producers in the mangrove swamp?
crab and pelican
mold and plankton
pelican and mangrove trees
mangrove leaves and phytoplankton
Which of the following is an example of a species?
birds
birds of prey
owls
spotted owl
Gregor Mendel observed that two plants with purple flowers could produce some offspring with white flowers and some offspring with purple flowers. Which of the following did Mendel use to explain this result?
genetic mutations
environmental conditions
inherited and acquired traits
dominant and recessive traits
How do organisms get the energy they need to grow, breathe, and move?
exercise
consume other organisms
generate body heat
flee from predators
Which of these effects could not be directly caused by mutations in human DNA?
cancer
genetic disorder
an injury
an inherited disorder
In what order should you place the cards to show mitosis and cytokinesis from start to finish?
1 >2 >3 >4 >5
2>4>5>1>3
3>1>5>2>4
4>2>1>5>3
When two different alleles are present for a trait that is codominant, what does the resulting phenotype display?
only the recessive allele
only the dominant allele
the expression of both alleles
a phenotype intermediate to the two parents
Which of these statements best describes a niche?
the role of a species in its ecosystem
the way a species investigates its habitat
the way a species uses the resources in its habitat
the way a species interacts with other species in its habitat
Which claim explains why all organisms need food?
Food provides organisms with all the water they need.
Food provides energy needed by cells.
Food provides the oxygen that is needed for respiration.
Food provides organisms with the DNA they need to grow
All organisms take energy from their environment. Every organism needs this
energy in order to grow and reproduce. How do producers get energy?
They obtain energy by eating plants, bacteria, and algae.
They extract chemical energy from decaying organic matter.
They extract energy from the chemicals in soil, air, and water.
They capture energy from sunlight and manufacture their own food.
What is the result of mitosis?
two new identical cells
two new nuclei
two new copies of DNA
two new pairs of chromosomes
What does the law of conservation of energy state?
Organisms change energy into mass.
Energy cannot be created or destroyed.
Organisms save the energy that they create.
It is important to use as little energy as possible.
Which of the following are both abiotic factors in the mangrove ecosystem?
water and pelican
sun and rocks
pelican and crab
snail and water
Each organism has its own role in an ecosystem. Organisms can be producers, consumers, or decomposers. Which of these organisms can be classified as a decomposer?
bee
flower
mushroom/fungus
turtle
Which of these claims is true of asexual reproduction?
It produces offspring genetically identical to each other and requires one parent.
It produces offspring genetically identical to each other and requires two parents.
It produces offspring genetically different from each other and requires one parent.
It produces offspring genetically different from each other and requires two parents.
Polar bears live in the Arctic. Ice in the Arctic is melting rapidly, reducing the range in which the polar bear can live. If polar bears do not have adaptations that allow them to survive these changes, what may happen to the polar bear?
.
They may overpopulate.
They may become extinct.
They may change the environment.
They may become another species
