7th Grade 1st Semester Science Exam
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- community
- A(n) __________ is all the populations in an ecosystem.
- biosphere
- __________ is the part of Earth that supports life.
- zoology
- I like to work with animals because they are so cute. I like to help animals who are sick or hurt. I study __________.
- variable
- A factor in an experiment that can change is a(n)__________.
- 2.34 g
- If you were to round off the measurement 2.33501 grams to three digits, you would get __________.
- SI
- _______________ provides a worldwide standard of physical measurement.
- paleontology
- I want to know what kind of animals and humans lived long ago. I study __________.
- His cells were not use to the extra miles and had to use stored energy which caused fermentation to produce lactic acid as a waste product.
- A student who is accustomed to running one or two miles runs five miles one particular afternoon and complains of pain in his leg muscles. The student's coach explains that the pain is caused by lactic acid. How did lactic acid get into the student's leg muscles and why did it only happen on the one afternoon?
- their results are more likely to be reliable
- Scientists conduct multiple trials of their experiments because
- 46
- Each human skin cell has ____ chromosomes.
- equilibrium
- __________ occurs when molecules of one substance are spread evenly throughout another substance.
- osmosis
- The passive transport of water through a membrane is __________.
- habitat
- Trees are an example of the woodpecker's __________.
- meteorology
- I want to know more about why we get severe storms in spring. I study __________.
- endocytosis
- Substances too large to pass through the cell membrane enter the cell in a process called __________.
- the red flower allele is dominant
- Robert crossbreeds two plants, one with red flowers and one with white flowers. Weeks later the offspring plants produce red flowers. Robert determines that __________.
- way the data is organized
- The advantage data in a table has over data presented in a paragraph is the __________.
- organ
- The liver, which is made of a variety of different cell types, helps digest food. The liver is a type of __________.
- predators
- __________ limit the size of prey populations, increasing the number of different species that can live in an ecosystem.
- alleles
- A Punnett square shows you all the ways in which __________ can combine.
- hypothesis
- A prediction or statement that can be tested is a(n)__________.
- recognizing and identifying the problem
- Which steps to solve a problem must be completed first? (scientific method)
- population
- Competition for food, living space, or other resources can limit the __________.
- geology
- I want to know what the Earth looked like long ago. I study __________.
- uracil
- RNA structure differs from DNA in that it contains the nitrogen base ___________ in place of thymine
- asexually
- Toshiko wants to determine what type of reproduction a particular organism undergoes. She finds out the all of the organism's offspring look identical to the original organism. She determines that this organism reproduces ______.
- honeybee
- Which of the following is NOT a producer? (pine tree, tulip, grass, honeybee)
- decreased plant growth
- Which of the following is an effect of drought that is likely to lead to the extinction of a species of grazing animals?
- population
- A(n) _____ is made up of all the organisms in an ecosystem that belong to the same species.
- ecosystem
- A(n) __________ includes all the organisms living in an area and the nonliving feature of their environment.
- nucleus cell
- Mitosis is defined as division of a ___________.
- hybrids
- Mendel called plants that received different alleles for a trait from each parent __________.
- genetics
- I find out why some people are born with certain conditions or diseases. I would also like to find out if some diseases are passed down by parents. I study __________.
- exocytosis
- Which of the following is not involved in bringing materials into cells? (endocytosis, osmosis, active transport, exocytosis)
- oceanography
- I try to find out how pollution affects living things in the ocean. I study __________.
- population
- Which of the following factors is not considered to be part of a region's climate?
- interphase
- Most of the life of any cell is spent in a period of growth called __________.
- astronomy
- I want to find out more about Pluto and why it's not a planet. I study __________.
- prophase, metaphase, anaphase, telophase
- Which of the following lists the stages of mitosis in the correct order?
- sun
- The _____ is a source of energy that fuels most life on Earth.
- endocytosis
- White blood cells in your body defend you against infection by engulfing invading organisms. The white blood cell engulfs the invader into itself by the process of __________.
- rectangle
- Which of the following is NOT a characteristic of an animal cell? (round, rectangle, no cell well, no chloroplast)
- chemistry
- I like to see what happens when I mix different substances to see how they react. (Louis Pasteur is famous for studying this).
- 22,800 seconds
- How many seconds are in 6 hours and 20 minutes?
- round
- Which of the following is NOT a characteristic of a plant cell? (round, rectangle, cell wall, chloroplast)
- physics
- I want to better understand light and time. Albert Einstein is famous for studying this.
- RNA
- The chromosomes in the nucleus of a cell contain a code known as __________.
- uracil
- DNA does NOT contain the nitrogen base __________.
- food web
- __________is a model that shows the complex feeding relationship among organisms in a community.
- heredity
- The process of an organism passing on its traits to its offspring is called
- conserve water
- During the hot, dry African summer months, African clawed frogs can dig one-foot deep burrows into the mud. The frogs leave a small hole open to supply air. They can stay in these burrows for up to 10 months. The frogs MOST likely live in these burrows in order to __________.
- medicine
- I want to be a doctor, so I need to study this.
- botany
- I like to work with plants to figure out exactly how they work. I study __________.
- the cells must be using active transport
- A cell biologist is studying how cells use a particular substance. If energy is used to move this substance across a cell membrane, then __________.
- drawing conclusions
- Which steps to solve a problem is completed last? (scientific method)
- communicate those results to other people
- After scientists analyze the results of their experiments, they __________.