Name______Period______Date______
SCIENCE 7MIDTERM REVIEW
- SCIENTIFIC METHOD
1. Read the experiment below to answer the questions below.
John is testing if fertilizer increases plant growth. His hypothesis was that fertilizer would increase the growth of plants.
He tests 2 plants. Plant A was grown in soil and Plant B was grown in soil with fertilizer added to it. John gave each plant the same amount of water, and the same amount of sunlight. He measured the height of each plant once a week for 5 weeks. At the end of the experiment, the height of Plant A was 10 cm and the height of Plant B was 15 cm.
a. IV: ______b. DV: ______
c. control group: ______
d. What are two factors that must remain constant? ______
e. Describe what can be done to make the results of this study more reliable.
______
B. MEASUREMENT
2. The volume of water in a graduated cylinder is 30mL. A marble is placed into the
graduated cylinder. The volume of the water is now 34mL. What is the volume of the marble? ______
3. An object has a length of 2 cm, a height of 3 .2 cm and 4. What is the mass shown by the triple beam balance below? Don’t
a width of 0.23 cm. What is the volume of the object? forget the units!
Show all work below.
______
5. What is the length of the object shown
below in centimeters?
______
______
7. a. The mass of an object is 50gm and its volume is 5.5 mL. What is the density of the object?
Show all work.
b. Does the object float or sink in water? Explain?
______
______
8.Identify the following temperatures in degrees Fahrenheit and degrees Celsius.
a. melting point of water ______c. boiling point of water ______b. freezing point of water ______
C. MICROSCOPE
MAKE SURE YOU KNOW THE PARTS OF A MICROSCOPE!!
9. Which part of the microscope controls the amount of light used? ______
10. When switching from low to high power, what happens to the field of view? ______
11. What is the total magnification produced by a microscope, using a 10X ocular lens and a 10X objective lens? ______
12. A specimen moves to the right side of the slide.. Which way should does it appear to move when you look into the microscope?
______
13. The cover slip must be lowered onto the specimen at an angle on A WET MOUNT to avoid ______.
14. A substance added to a wet mount, that makes cell parts more visible is called ______.
15.What is the diameter of the field of view below in 16. What is the length of one of the cells in the field of view millimeters and micrometers? in millimeters and micrometers if the diameter is 8mm?
D.CELLS AND CELL PROCESSES
17.Identify the Life Processes being described below.
LIFE PROCESSESDESCRIPTION
____ 1. TransportA. Sum/total of all life processes in the body
____ 2. LocomotionB. Movement of materials through the body & within a cell
____ 3. NutritionC. Control coordination of all life processes
____ 4. RespirationD. Movement from one place to another
____ 5. ExcretionE. Small molecules join to form large molecules
____ 6. GrowthF. Taking in materials from the environment to be used by the body
_____7. Reproduction G. Production of new individuals
_____8. SynthesisH. Production of energy
____ 9. RegulationI. Removal of metabolic wastes
____ 10. MetabolismJ. Increase in cell # (cell division)
REVIEW THE DIAGRAMS OF THE PLANT AND ANIMAL CELL!!!
18. Which part of the cell:
a. transports materials ______g. packages and ships materials ______
b. carries out respiration ______h. gives a plant cell it’s shape ______
c. stores materials ______i. aids in cell division in animal cells ______
d. produces proteins ______j. controls the cell ______
e. is semi-permeable ______k. digests materials in animal cells ______
f. Carries out photosynthesis______
19. List the 5 levels of organization of a multicellular organism from smallest to largest.
______
20. Below is a diagram of two spaces being separated by a selectively permeable membrane.
21. Identify the type of respiration being described:
a. Requires oxygen______e. produces 36 ATP______
b. Fermentation______f. occurs in mitochondria______
c. Occurs in the muscles when in the absence of oxygen ______
d. Carried out by yeast ______
D. CHEMISTRY
22. Label the subatomic particles of the atom below and indicate its charge.
23. Identify each phase below (solid, liquid, gas).
24. For the following questions, choose the phase change that is described by each statement.
Melting EvaporationCondensationFreezingSublimation
______a. Gas changes to liquid. ______d. Solid changes directly to the gas phase.
______b. Liquid changes to gas. ______e. Liquid changes to a solid.
______c.Solid changes to liquid.
25. For the following questions, determine if a physical (P) or chemical change (C) is being described.
_____a. Iodine reacts with hydrogen to form a gas_____d. Explosion of fireworks
_____b. Shattering of a glass _____e. Drying of wet laundry.
26. The following statements are false. Change the underlined word to make the statement correct.
a. In a compound, elements are physically combined. ______
b. In a mixture, substances cannot be separated by physical means. ______
c. A compound cannot be broken down into a simpler substance. ______
27. Select the family of elements being described (Metals - M, Nonmetals - N, Metalloids - ME, Noble Gases - NG)
_____a. Very ductile and malleable _____e. Brittle _____b. Good conductors ____d. No luster _____f. Can be shiny or dull
28. Use the Periodic Table below to answer the following questions.
29. The graph below shows the heating curve for water. Answer the questions using the graph.
30. Base your answers to the following questions on the information and data table below and on your knowledge of science.
During a study done on yeast cells, a student used a microscope to determine the number of yeast cells present at various times. The results are summarized in the data table below.
Time(hours) / Number of
Yeast cells
0 / 5
1 / 10
2 / 18
3 / 45
4 / 30
5 / 8
a. Mark an appropriate scale on each labeled axis.
b. Plot the data on the grid.
c. Surround each point with a small circle.
d. Connect each point.
e. What is the dependent variable? ______
e. Approximately how many yeast cells were present after 2 hours? ______