Download Grade 7 Science-Unit 2: Formative Pre

Grade 7 Science-Unit 2: Formative Pre-assessment 1
Select the best answer choice for each question.
1. A testable question in scientific inquiry is one that can be investigated through experiments
and observations. It should lead to gathering evidence and using data to explain how the
natural world works. Choose the answer below that is more appropriate for a research report
than a testable question in an experimental design.
A. Which dye is the most effective stain for viewing cheek cells under the microscope?
B. What is the effect of pH on the lifespan of tadpoles?
C. Why do some people distrust genetically engineered crops?
D. What is the best seed design for effective wind dispersal?
2. A student researching a new discovery about the activity of mitochondria could find the most
current and reliable information from which resource?
A. scientific journal
B. popular news magazine
C. cell biology text
D. newspaper blog
3. The quality of pond water can be determined by identifying the number and types of
organisms found living in the water. Which piece of equipment will best help students
identify some of these organisms?
A. microscope
B. pH paper
C. binoculars
D. pan balance
Grade 7 Science-Unit 2: Pre-assessment 2
4. Use the chart to answer the question.
Cell Organelle Chart (partial)
ORGANELLE
cytoplasm
IN PLANT?
Yes
IN ANIMAL?
Yes
mitochondria
Yes
Yes
ribosome
Yes
Yes
STRUCTURE AND FUNCTION
Thick fluid region of a cell located inside
the cell membrane (in prokaryotes) or
between the cell membrane and
nucleus (in eukaryotes)
Small grain-shaped organelle in the
cytoplasm of a cell that produces
proteins
Martha’s lab assignment requires her to complete this section of the Cell Organelle Chart.
Which description would be the correct entry for Martha to place in the empty “Structure and
Function” box of the chart?
A. Stacks of saucer-shaped membranes that receive proteins and other newly formed
materials from the endoplasmic reticulum, packages them, and distributes them to
other parts of the cell
B. Sac-like organelles that contain substances that break down large food particles into
smaller ones.
C. Rod-shaped organelles that convert energy in food molecules to energy the
cell can use to carry out its functions.
D. Rigid structure providing support for cell.
5. Students in a life science class thought that salt water would affect the movements of planaria.
They put 25 planaria in salt water and recorded their observations. Which flaw is present in
the design of their experiment?
A. There was no hypothesis.
B. There was no control.
C. The sample was too big.
D. The procedure was too complicated.
Planaria
Grade 7 Science-Unit 2: Pre-assessment 2
6. Use the diagram to answer the question.
The diagrams are models of an animal cell and a
plant cell. Models are useful tools for scientists
but they do have limitations in representing the
natural world. Which statement below is the
best answer for describing the limitations of
these models.
A. The cell diagrams are flat and not three-dimensional like an actual cell.
B. The diagrams represent a general idea of cells; there are many different shapes and
structures of specialized animal and plant cells in nature.
C. The diagrams do not show the interactions of the organelles within the cell system.
D. All of the above.
7. Use the data chart and diagram to answer the question.
Salt water
concentration
Contractions in 30
seconds
2.00%
0
1.50%
4
1.00%
12
0.50%
20
0.00%
28
A paramecium maintains a stable size and shape by responding to variations in the concentration
of salt in the water in which it lives. Tammy and Jeanine presented the hypothesis that the
greater the concentration of salt in the water, the fewer times the paramecium will contract its
contractile vacuole. The chart above shows the data they collected during their investigation.
What is the conclusion that best matches the data recorded in their chart?
A. As the salt water concentration decreases, the number of contractions decreases.
B. Salt water does not affect the number of contractions.
C. Salt water causes the paramecium to swim faster.
D. As the salt water concentration decreases, the number of contractions increases.
Grade 7 Science-Unit 2: Pre-assessment 2
8. Use the diagram to answer the question.
The diagram illustrates some of the locations
of three specialized muscle cell types: cardiac,
skeletal, and smooth. Which statement below
is an inference that can be made by viewing
this diagram.
A. Cardiac muscle cells have striations.
B. Skeletal muscle cells are cylindrical.
C. Some stomach aches may involve smooth muscle cells.
D. Smooth muscle cells are flat and elongated.
9. Use the picture to answer the question.
Cheek cells in this slide have been stained with a dye called blue methylene. If you could see
the slide in color, you would see different shades of blue. What is the main reason why
scientists stain some cells before they view them under the microscope?
A. Stains are used primarily to preserve the cells.
B. Stains help scientists keep their cell collections identified and separated from other
cell types.
C. Stains keep the cells from moving around too much.
D. Stains help scientists see structures inside of cells that would otherwise be invisible.
Grade 7 Science-Unit 2: Pre-assessment 2
10. Which structure makes a plant cell rigid?
A. chloroplast
B. cell membrane
C. cell wall
D. chromosome
11. The work of Robert Hooke and Anton van Leeuwenhoek, as well as many others, eventually
led to the development of the cell theory. Which statement below is not part of the cell
theory?
A. All living things are composed of cells.
B. Cells are the basic units of structure and function in living things.
C. All cells are produced from other cells.
D. All cells are surrounded by cell walls.
12. In the mid-1930s, a microscope was invented that allows scientists to examine objects in
extremely fine detail by magnifying objects at 300,000X their size. Today, they are
primarily used in scientific and medical research, in industry, and even in crime scene
evidence investigations. Scientists have produced images of molecules and atoms using this
kind of microscope. What is the name of this type of microscope?
A. light microscope
B. compound microscope
C. electron microscope
D. digital microscope
Grade 7 Science-Unit 2: Pre-assessment 2
13. Use the graph to answer the question.
Jason designed an experiment for his science
fair project. His experimental design is shown
to the right. He is planning to test the effect of
soil pH on the growth of bean plants. He will
grow one bean plant under the same conditions
except for the pH of the soil. What is the best
way to improve his design?
A. Run more trials by adding more bean plants to each pH group.
B. Vary the pH of the water he will use to irrigate the bean plants.
C. Switch the 150 watt bulbs with 40 watt bulbs.
D. Put the bean plants in larger pots.
14. Use the diagram to answer the question.
The diagram shows examples of specialized cells. Choose the answer below that is not a
characteristic of specialized cells.
A. Specialized cells carry out key functions, such as getting oxygen.
B. Specialized cells perform specific functions that benefit the entire organism.
C. Specialized cells differ in function but not in structure from other cells.
D. Specialized cells share a “division of labor.”
Grade 7 Science-Unit 2: Pre-assessment 2
15. Current medical research is moving toward being able to analyze the DNA of patients to
determine the best types of treatment for their diseases. Who will have access to this
technology in the near future?
A. most everyone because DNA analysis is such a powerful technology
B. people in industrialized countries because the procedures will be expensive at first
C. all people worldwide who have severe diseases
D. primarily people in the poorer countries because there is so much disease present
16. Specialized cells do very specific jobs. Which of these specialized cells carry oxygen in our
blood?
A. red blood cells
B. white blood cells
C. platelets
D. oxygen cells
17. Chloroplasts are found only in organisms that are able to
A. generate their own energy.
B. grow to a larger size.
C. migrate to other ecosystems.
D. hunt prey.
Grade 7 Science-Unit 2: Pre-assessment 2
18. Use the diagram to answer the question.
The diagram represents an animal cell. Choose the answer below that correctly identifies the
organelles of the cell.
A. 1: Golgi body
2: vacuole
3: cell wall
4: lysosome
B. 1: mitochondrion
2: ribosome
3: cell membrane
4: nucleus
C. 1: vacuole
2: ribosome
3: cell wall
4: endoplasmic reticulum
D. 1: mitochondrion
2: cytoplasm
3: endoplasmic reticulum
4: nucleus
19. What is the term for a large group of similar cells?
A. organ system
B. organ
C. skin
D. tissue
Grade 7 Science-Unit 2: Pre-assessment 2
20. Use the diagram to answer the question.
This model of “Cell City” can be used to represent how the parts of a cell function in ways
that are similar to the parts of a city. Choose the answer below that incorrectly matches the
cell organelle and its function with the model structure in Cell City.
A. nucleus: matches #6 - the city hall
B. endoplasmic reticulum: matches #7 - storage tanks
C. cell membrane: matches # 8 - the city wall and gate
D. mitochondria: matches #3 - power plant
Grade 7 Science-Unit 2: Pre-assessment 2
21. Use the graph to answer the question.
The graph shows the growth curve of a bacterial
population. According to this information, the
bacterial populations double every time which
amount of time passes?
A.
3 minutes
B. 20 minutes
C. 30 minutes
D. 60 minutes
22. Use the diagram to answer the question.
The diagram represents five red blood cells seen
through a microscope. The lines represent a scale
also visible through the microscope. Each division
on the scale represents one micrometer. Use the
scale to estimate the diameter of the average red
blood cell.
A. 4-5 micrometers
B. 7-8 micrometers
C. 10-11 micrometers
D.
12-13 micrometers
Grade 7 Science-Unit 2: Pre-assessment 2
23. Use the diagram to answer the question.
A plant cell is shown above. Which of these organelles uses light energy to produce sugar?
A. chloroplast
B. vacuole
C. nucleus
D. mitochondrion
24. Use the chart to answer the question.
Study the diagram of the animal cell shown above. In animal cells, the endoplasmic reticulum
serves as a channel for the transport of materials through the cell. The outer surface of the
endoplasmic reticulum may be smooth or rough. Which cell structures cause the outer surface of
endoplasmic reticulum to appear rough?
A. ribosomes
B. transport proteins
C. mitochondria
D. Golgi bodies
Grade 7 Science-Unit 2: Pre-assessment 2
25. Marvin uses a microscope to view an unknown cell. He is able to identify two of the cell
organelles and determines that the cell he is viewing is a plant cell. Which answer choice lists
the two organelles that he is most likely viewing under the microscope to help him make a
definite decision?
A. nucleus and mitochondria
B. Golgi apparatus and ribosome
C. cell wall and large vacuole
D. cytoplasm and ribosomes
26. Mitochondria function most like which answer choice?
A. a power plant
B. a pipeline
C. an instruction book
D. a packaging plant
27. Use the diagram to answer the question.
The picture shows a coverslip correctly being lowered onto a slide. Why is this particular
method used?
A. It prevents the escape of microorganisms found in the water.
B. It allows microorganisms to move freely in the water.
C. It prevents the coverslip from moving.
D. It reduces the possibility of air bubbles on the slide.
Grade 7 Science-Unit 2: Pre-assessment 2
28. Use the passage in the box to answer the question.
These words were written by Robert Hooke in 1665. The pores or cells that Hooke described in
his notes were really which of the answer options?
A. cell walls
B. mitochondria
C. nuclei
D. cell membranes
29. Use the diagram to answer the question.
(2 points short answer)
The diagram shows an animal cell and a plant cell.
Describe 1 difference (contrast) and 1 similarity
(compare) between animal cells and plant cells.
Grade 7 Science-Unit 2: Pre-assessment 2