7th Grade Final Study Guide
1. Which molecules do animal cells take in and use for energy production in the mitochondria?
2. If a cell is 5 cm in diameter on day 1 and it is 10 cm on day 5, what process has occurred?
3. Which organelle does cellular respiration occur?
4. What do vacuoles do in a cell?
5. Which organelle is found in most plant cells, but not found in animal cells?
6. Which cell part allows substances to enter and leave the cell?
7. Which cell part regulates substances entering and leaving the cell?
8. Which substances do plants use to begin the process of photosynthesis?
9. Where does the oxygen on the Earth come from?
10. Which organism would do the process that is represented by this equation:
12 H2O + 6CO2  C6H12O6 + 6 H2O + 6O2
11. Where does photosynthesis take place in a plant cell?
12. If a cow eats a plant, which level would they be considered in a food web?
13. What would be a primary consumer in this food web?
14. A simple pathway where one organism eats another is called what? How many of these are there in the food web
in number 13?
15. What is the original source of energy for all organisms?
16. In a food web, which organisms have the greatest amount of stored energy?
17. Put these in order from highest available energy to the lowest: herbivore, carnivore, autotroph(makes own food
from photosynthesis)
18. In a food chain, which organisms would have the smallest number of individuals in a population? Which organism
would this be in the food web in number 13?
19. What is the correct order of organisms in a food chain?
20. Name 2 types of producers.
21. In the ocean ecosystem in the diagram below, which organisms would have the least number in their population?
22. Successive transfers of energy from green plants through a series of organisms is referred to as what?
23. List two food chains that can be found in the meadow food web below:
24. What would be the primary role of wheat in this food chain?
Wheat  mouse snake  hawk
25. Which organisms break down decaying animals and waste and return the nutrients back to the soil? Give two
examples of these organisms.
26. Where are producers found in an energy pyramid?
27. What is the atomic number equal to?
28. All of the atoms of argon have the same amount of __________ so they have the same ____________ number.
29. The atomic number of any element is equal to the number of what?
30. Protons + neutrons = m_______ n____________. What is the total number of protons and neutrons in
Bromine?
31. Which number can be used to identify an element?
32. What is the atomic number and mass number of the atom below?
33. What can be determined if only the atomic number is known?
34. What will happen to the force between two magnets if you pull two magnets away from each other?
35. If you have a battery, wire wrapped around a nail, and the wire attached to the battery, what can the nail do?
36. What is an electromagnet?
37. A balloon has a negative charge and a glass rod has a positive charge. What will happen if you bring the two
towards each other?
38. Where is the magnetic field strongest in the diagram below?
39. Where is Earth’s magnetic field the strongest?
40. A balloon is rubbed with a piece of cloth. As a result, the balloon has a negative charge. What has happened?
41. If you comb your hair and then hold the comb near your hair, your hair moves towards the comb. Why?
42. Which charges attract? Which charges repel?
43. If you move a south end of a magnet towards a north end of a magnet, what will happen?
44. If you move a north end of a magnet towards another north end of a magnet, what will happen?
45. What three things are needed to make an electromagnet?
46. Why does a plastic rod have a negative charge after being rubbed with a piece of fur?
47. A teenager removes the plastic wrapping from a CD. The pieces of wrap cling to her hand. What is this force
called?
48. A balloon is rubbed against a sweater, what will happen and why?
49. How do you make an electromagnet stronger?
50. Two oppositely charged particles are brought towards each other, what will happen?