grade 7
worksheet unit 1 lesson 1
introduction to livng things
using key terms
Complete each of the following sentences by choosing the correct term from the word bank.
stimulus heredity
homeostasis consumers
1. The process of maintaining a stable internal environment is known as ______.
2. Offspring resemble their parents because of ______.
3. A ______obtains food by eating other organisms.
4. A ______any change that affects the activity of living organisms
Multiple Choice
1. Which of the following statements about cells is true?
a. Cells are the structures that contain all of the materials necessary for life.
b. Cells are found in all organisms.
c. Cells are sometimes specialized for particular functions.
d. All of the above
2. Which of the following statements about all living things is true?
a. All living things reproduce sexually.
b. All living things have one or more cells.
c. All living things must make their own food.
d. All living things reproduce asexually.
3. Organisms must have food because
a. food is a source of energy.
b. food supplies cells with oxygen.
c. organisms never make their own food.
d. All of the above
4. A change in an organism’s environment that affects the organism’s activities is a
a. response. c. metabolism.
b. stimulus. d. producer.
5. The following image should be studied and used to answer the following question.
What type of reproduction is occurring in the above image? In addition, identify the specific method you observe.
A. sexual reproduction, meiosis
B. reproduction is not occurring
C. asexual reproduction, budding
D. asexual reproduction, binary fission
6. Which of the following is an example of homeostasis?
A. A human body loses too much heat on a cold day, and hypothermia occurs.
B. A cactus stores water during wet periods, allowing it to live through dry periods.
C. A human participates in vigorous activity on a hot day and eventually suffers from dehydration.
D- A snake rests in the sun on a summer day, and its body temperature eventually becomes too hot for survival.
7. How do producers get the energy their bodies need to survive?
A. Producers make their own food.
B. Producers get energy through the burning of fossil fuels.
C. Producers cannot make their own food and must eat other organisms.
D. Producers get energy by breaking down the nutrients in dead organisms.
8. What are the four things that all living things need to survive?
A. water, air, food, and a place to live
B. a place to live, light, air, and mobility
C. food, water, a place to live, and family
D. light, food, sleep, and the ability to hunt
Short Answer
1. What is the difference between asexual reproduction and sexual reproduction?
2. In one or two sentences, explain why living things must have air.
3-Define stimulus and homeostasis
4- Write the needs of living things
5- Write some examples of stimulus .
6-Writhe the characteristics of living things
.
worksheet unit 1 lesson 2
theory of evolution
Choose the correct answer
1-What is evolution?
A. a group of organisms that can mate to produce fertile offspring
B. the process by which inherited traits of a population change over many generations
C. a trait that allows organisms in a population to survive and reproduce in their environment
D. the process in which individuals better adapted to their environment are more likely to survive and reproduce
2-Which of these statements best describes what Charles Darwin observed on the Galápagos Islands?
A. The finch population on each island was unique.
B. The finches on the islands ate seeds and nuts but no insects.
C. The finches on the islands were the same as the finches in Ecuador.
D. The finches could produce offspring only with finches from other islands.
3-Which of the following is a situation that could lead to the extinction of a species?
A. increased habitat
B. increased food supply
C. increased competition
D. increased population size
4-What is artificial selection?
A. the process by which humans breed organisms for certain characteristics
B. the process by which inherited traits in a population change over generations
C. the process by which Charles Darwin noted the differences among finches on the Galápagos Islands
D. the process in which individuals better adapted to their environment are more likely to survive and reproduce
5-What is a population?
A. a group of organisms that can mate to produce fertile offspring
B. a group of organisms of the same species that live in a defined geographical area
C. a process by which inherited traits in a population change over many generations
D. a process in which better-adapted individuals are more likely to survive and reproduce
6-Darwin’s theory of natural selection consists of four important parts. Which of these correctly lists the four essential parts of natural selection?
A. living space, adaptation, selection, and hunting
B. overproduction, genetic variation, comprtition, and adaptation
C. selection, extinction, underproduction, and competition
D. asexual reproduction, genetic variation, selection, and adaptation
7-Which of the following best describes the role of mutation in natural selection?
A. A mutation is a feature that helps an organism to better survive in its environment.
B. An organism may acquire an advantageous mutation by interacting with its environment.
C. A mutation may result in an adaptive trait that makes an organism more likely to reproduce.
D. Organisms with certain physical traits are more likely to win competitions for limited mutations.
8-What did Darwin do in order to study plants and animals?
a. He took a trip around the world.
b. He studied theology.
c. He formed theories.
d. He became a doctor.
9-What did Darwin do during his travels?
a. He wrote a book about his theory.
b. He collected thousands of plant and animal samples.
c. He took photos of plants and animals.
d. He visited all the continents.
10 . What puzzled Darwin about the Galápagos finches?
a. They were so different.
b. They should not have been there.
c. They were too similar.
d. They were similar but had many adaptations.
Match the correct description with the correct term. Write the letter in the space provided.
11. the idea that human populations can grow faster than the food supply
12. the idea that Earth had formed naturally over a long period of time
13. the practice of breeding plants and animals to have desired traits
Answer the following questions
1-What was one way that finches on different islands differed from each other?
2-. What was the beak of each finch adapted to?
4. Why might artificial breeding be used in horses?
Match the correct description with the correct term. Write the letter in the space provided.
1. Many more offspring are produced than will survive.
2. No two offspring are alike.
3. Many offspring will be killed before reproducing.
4. The best adapted organisms will have many offspring.
worksheet unit 1 lesson 3
evidences of evolution
choose the correct answer
1-The diagram below shows a portion of the fossil record in sedimentary rock. Different rock layers and fossils are clearly visible.
Which layer of rock is the oldest?
A. Layer A is the oldest.
B. Layer B is the oldest.
C. Layer D is the oldest.
D. They are all the same age.
2-Nada is studying fossils. His teacher wrote the following statements on the board and asked the students to put them in the correct order to describe how fossils are formed.
1. Minerals seep into the organism’s body and replace it with stone.
2. The organism completely decomposes, leaving behind an imprint.
3. An organism dies and its body is covered with a layer of sediment.
4. Time passes, and sediment layers continue to build up on the organism.
Which is the correct order of events for fossil formation?
A. 3, 4, 1, 2
B. 2, 3, 4, 1
C. 1, 3, 2, 4
D. 3, 2, 1, 4
3-Dana discovered that two modern-day species have very similar DNA. He concludes that the two species are closely related. What type of evidence did William most likely use to reach his conclusion?
A. fossil evidence
B. genetic evidence
C. structural evidence
D. evidence from developmental patterns
4-Which of these cases provides embryological evidence that two species share a common ancestor?
A. two species with very similar DNA
B. two species with different body structures
C. two species with different structures that have similar functions
D. two different species with similar patterns of early development
5-Which of these descriptions is an example of an unused body structure?
A. a bat’s wing that enables it to fly
B. the tiny leg bones found in snakes that have no legs
C. the front legs of a dog that supports its weight as it walks and runs
D. the tentacles of an octopus that aid it in movement and catching prey
6-Which of these answers best describes a fossil?
A. thick layers of rock
B. organism from which other organisms are descended
C. body of an organism that died recently but has not decomposed
D. remains of a once-living organism found in layers of rock, ice, or amber
7-Which of these best describes the tiny leg bones that some whales have, which do not aid in their movement or serve any other function?
A. structures that grows and improves in function as they are used
B. structures that will become adaptations when the environment changes
C. structures that have lost all or most of their function over evolutionary time
D. structures that function at certain times of the year or under certain conditions
8-Two species might have similar skeletal structures that have different functions. What do these types of structures suggest about the relationship between the two species?
A. Common structures with different functions suggest that the species live in the same habitat.
B. Common structures with different functions suggest that the species do not share a common ancestor.
C. Common structures with different functions suggest that one of the species never learned how to use the structure properly.
D. Common structures with different functions suggest that the species share a common ancestor that also had a similar structure.
9-Snakes have traces of leg like structures that are not used for movement. Which of the following could you infer from this evidence?
A. Snakes do not have ancestors.
B. Snakes are an example of transitional fossils.
C. Snakes share a common ancestor with animals that have legs.
D. Snakes and animals that have legs are part of the same species.
10-Describe three different types of evidence that scientists use to support the theory of evolution.
______
______
______
worksheet unit 1 lesson 5
classification of living things
Choose the correct answer
1. Which factor best explains why classification systems change over time?
A. / changing environments lead to reclassificationB. / increased plant species leads to reclassification
C. / changes in food sources leads to reclassification
D. / increased knowledge of genetics leads to reclassification
2. What are two different characteristics that scientists examine to classify living things?
A. / blood characteristics and naming characteristicsB. / chemical characteristics and DNA characteristics
C. / physical characteristics and chemical characteristics
D. / physical characteristics and environmental characteristics
3. Which of the following identifies the levels of classification in correct order?
A. / domain, kingdom, phylum, class, order, family, genus, speciesB. / genus, species, domain, kingdom, phylum, class, order, family
C. / domain, kingdom, genus, species, phylum, class, order, family
D. / genus, species, phylum, class, order, family, domain, kingdom
4. Nancy listed major questions that scientists try to answer when they classify organisms. Her list included the following questions:
How many living things are there?
What are the characteristics that define living things?
What additional question would be best for Nancy to add to her list about classification?
A. / How are living things related?B. / How do living things get energy?
C. / What do living things need to survive?
D. / Where do living things make their home?
5. How are members of Domain Eukarya different from members of Domain Archaea and Domain Bacteria?
A. / Members of Domain Eukarya are less complex than the members of Domain Archaea and Domain Bacteria.B. / Members of Domain Archaea and Domain Bacteria are multicellular, and members of Domain Eukarya are usually single-celled organisms.
C. / Members of Domain Eukarya have cells with membrane-bound organelles, and members of Domain Archaea and Domain Bacteria lack nuclei.
D. / Members of Domain Bacteria and Domain Archaea have structures for making their own food, and members of Domain Eukarya lack these structures.
6. Linnaeus’s contributions most helped develop which area of science?
A. / medicineB. / taxonomy
C. / chemistry
D. / microbiology
7. Which of the following statements correctly describes a kingdom of Domain Eukarya?
A. / Kingdom Protista includes single-celled organisms that lack nuclei.B. / Kingdom Animalia includes multicellular organisms that make their own food.
C. / Kingdom Plantae includes multicellular organisms that can move independently.
D. / Kingdom Fungi includes organisms that get energy by decomposing materials in their environment.
8. Which of the following is a characteristic of Domain Archaea?
A. / multicellularB. / undergo photosynthesis
C. / membrane-bound organelles
D. / able to tolerate extreme conditions
9. Shaza's teacher gives her the following list of types of organisms:
1. Ferns 2. Yeasts 3. Algae 4. Insects
Shaza needs to identify the kingdom for each type of organism. In what order could she list the kingdoms for organisms 1 through 4?
A. / Plantae, Fungi, Protista, AnimaliaB. / Animalia, Protista, Plantae, Fungi
C. / Plantae, Protista, Fungi, Animalia
D. / Fungi, Plantae, Protista, Animalia
10. During a research project, a scientist collects snails from a beach. He finds several snails that have shells of about the same size and shape. However, the shells have very different patterns and colors. How could the scientist best decide whether the snails belong to different species or to the same species?