NEW
Font size
Worksheets7th Grade Unit 5 Review
Total questions: 20
Worksheet time: 13mins
wildebeest and zebras migrating during the Great Migration in Africa's Serengeti ecosystem. Based on this photo why do they migrate?
To hunt in an environment with places to hide and stalk prey
To find an environment where more food and water is available
To escape from predators who can outrun them on a flat plain
To find an area that is closer to other animal habitats for mating
What is involved in the process of artificial selection?
Animals mate randomly,and a beneficial trait emerges in the offspring.
A new species is created through cloning and recombination
Humans select animals to breed that create offspring with desired traits.
An animals' genes undergo a mutation that produces a certain trait.
Which of the birds would most likely have the biggest advantage if the food supply suddenly
changed from seeds to nectar?
Bird W with its larger size, as it could visit less flowers and get more nectar.
Bird X with its larger eyes, as it could locate more flowers to get nectar.
Bird Y with its slender beak, as it could reach further inside flowers to get nectar.
Bird Z with its longer legs, as it could reach taller flowers to get nectar.
Solange found a bird that fell out of its nest. She used a dichotomous key to help her decide
which type of bird she found and what it eats. She concluded that the bird she found eats grub
worms. How did she come to this conclusion?
The bird has talons and a long, pointed beak.
The bird has webbed feet and a throat pouch.
The bird has webbed feet and a short, round beak.
The bird has talons and a short, pointed beak.
The primary result of the domestication of animals has been that domesticated animals are now
accustomed to —
living in homes as pets
tasting better and being healthier for consumption
living among and interacting with people
working and living on farms
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.
Why do you think this happened?
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.
Male butterflies in the population that survived were able to prey on the parasites living in
the females’ egg cells.
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.
Wheat was one of the first plant crops that humans domesticated. In the process of
domestication, the wild form of wheat was eventually changed into a form more suited to human
agricultural practice.
What kind of seeds did farmers most likely use?
thinner stems that could endure heavy winds
larger flowers that could be sold for additional income
taller stems that could block sunlight from weeds growing at ground level
larger grains that could produce more food per plant
A population of birds has many small variation among the individuals in the population. Variation in
beak size among these birds would affect their survival most if the —
type of food available in the area changes.
size of nesting areas decreases.
amount of water available in the area decreases.
weather changes.
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 can produce milk after eating the most food
By choosing cows that are high milk producers
By limiting the number of offspring per cow
By increasing the age of the cows that are bred
Based on the identification key, which type of tree is this sample from?
Ginkgo
Honey locust
Horse chestnut
Black maple
Which of the following correctly orders levels of organization from the lowest to highest level?
Organ → organ system → tissue → cell → organelle → organism
Organism → organelle → organ → organ system → cell → tissue
Organelle → cell → tissue → organ → organ system → organism
Tissue → organ → organelle → organism → organ system → cell
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 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.
The Hood mockingbird’s longer beak is an adaptation to the food available in the bird’s habitat
Lake Victoria in East Africa is home to many species of fish called cichlids. In 1954 the predatory
Nile perch was introduced to Lake Victoria. The Nile perch became the dominant fish species in
the lake by the mid-1980s. The number of cichlid species in the lake decreased as the Nile perch
population increased. The perch preyed heavily on cichlid species that fed on algae and debris on
the bottom of the lake. Algae in the lake increased, and oxygen levels decreased. The surface
area of the gills of some cichlid species has increased in just over 20 years.
Which statement explains the increase in gill surface area seen in some of Lake Victoria’s
cichlids?
Increased gill surface area has allowed the cichlids to change their diet and avoid competing with the Nile perch.
Increased gill surface area has allowed the cichlids to be camouflaged and avoid being eaten by the Nile perch.
Increased gill surface area has allowed the cichlids to better absorb the limited oxygen in the water.
Increased gill surface area has allowed the cichlids to leave Lake Victoria and establish populations in nearby bodies of water.
How do populations of juvenile salmon respond to changes in salinity as they migrate?
The juvenile salmon alter their behavior but do not utilize special structures.
The juvenile salmon alter their behavior and utilize special structures.
The juvenile salmon utilize special structures but do not alter their behavior.
The juvenile salmon utilize special structures to alter their behavior.
A
B
C
D
A
B
C
D
Why do Pacific Salmon move locations?
To avoid competition over resources and space with other salmon
To make it difficult for predators to know exactly where to find them
To find environments best suited for different parts of their life cycle
To help support the ecosystem by feeding bears, eagles, and osprey
What is a genetic change that has occurred in the horse over time?
The horse has lost its tail.
The horse has become less muscled.
The horse has developed four legs.
The horse has increased in size.
Which of the following explains why these animals have white fur?
Genes that carried instructions for white fur were passed to these organisms from their parents through heredity.
White fur is preferable in an Arctic environment, so the organisms chose to give this trait to their offspring.
The snow in this environment was so wet that it did not allow these animals to keep their color through the process of water absorption.
These organisms are all a part of the same species, and therefore share some characteristics
Even though each animal is in the deer family, why do they look different from one another?
The animals are at different age levels.
The animals inherited their genes from different parents.
The animals feed on different sources of food.
The animals live in different environments.
