Name: ______Date: ______Period #: ______
7th Grade Life Science Final Study Guide
Directions: Answer the questions below. Due Wednesday June 18th.
Section 1: Human Body
1. What is the main function of the respiratory system?
2. What is the main function of the circulatory system?
3. What is the main function of the digestive system?
4. How do the digestive, respiratory and circulatory systems work together to deliver oxygen and nutrients and remove carbon dioxide from your body?
5. What is cellular respiration?
6. What are the materials needed for cellular respiration?
7. What are the products released in cellular respiration?
8. Explain how chemical and mechanical digestion both occur in the mouth.
9. At which stages in your life do you need to eat the most? Why do you need to eat so much at that point in your life? Explain.
Section 2: Cells
10. What is a tissue?
11. What is a cell?
12. Put these terms in order from smallest to largest: organ, cell, tissue, organ system.
13. What is the function of the mitochondria?
14. Which type of human cell would have the most mitochondria and why?
15. What is the function of the vacuole?
16. Why is the vacuole larger in plant cells?
17. List 3 major differences between animal and plant cells.
18. What is the function of the red blood cell? Why is it shaped the way it is?
19. What is the function of the nucleus?
20. What is the function of the chloroplasts? What process are chloroplasts responsible for in plants?
21. How does a cell’s shape influence their function? Give an example.
Section 3: Genetics:
22. List 3 inherited characteristics.
23. List 3 acquired characteristics.
24. Define heterozygous and give an example. What is another word for heterozygous?
25. Define homozygous and give an example. What is another word for homozygous?
26.
D = dimples d = no dimples
Dd x Dd
a. What is the probability of a DD?
b. What is the probability of a Dd?
c. What is the probability of a dd?
d. What is the probability of having dimples?
e. What is the probability of not having dimples?
27. In humans, the allele for Widow’s peak is dominant (W) to the allele for a Straight hair line (w). If both
parents have a Widow’s peak, how is it possible that one of their children has a Straight hairline? USE A PUNNETT SQUARE!!
28. Explain the two major differences between sexual and asexual reproduction.
(Hint: How many parents does each require? Which produces a genetically identical offspring?)
Section 4: Natural Selection:
29. Define adaptation and give an example.
30. A bear’s environment is becoming colder over time. What would happen to the bear population’s fur over time? How would this help them survive and reproduce better? Explain!
31. Explain the adaptation(s) a frog has. How do they help them survive and reproduce?
32. During the Industrial Revolution, white birch trees (which have whitish bark) became covered with soot (black dirt) from factories. The peppered moths live in white birch forests. Most peppered moths were whitish with small gray spots on their wings. Predict how the entire population of peppered moths changed during the time of the Industrial Revolution. Explain how that adaptation enabled them to survive and reproduce better.
Section 5: Ecology
33. Define abiotic and give an example.
34. Define biotic and give an example.
35. Define decomposer and give an example.
36. Define producer and give an example.
37. Define consumer and give an example.
38. Explain how a decomposer is DIFFERENT than a consumer?
39. Define competition and give an example.
40. Give an example of a predator and its prey.
41. Define parasitism and give an example.
42. Give an example of symbiosis and explain it.
43. What energy role do food webs/food chains always begin with? Why?
44. Define herbivore and give an example.
45. Define carnivore and give an example.
46. In a food web/food chain, which organism(s) if removed would cause the death of the entire food web/food chain? Why?
47. Give at least 2 reasons a population of fish in a pond might decrease.
48. Give at least 2 reasons a population of fish in a pond might increase.