1. Environmental Science class
Chapter 1 Review
Environmental Science class

2. Leaving a population is called ____________. emigration

3. An environment that provides food, water and shelter to living organisms is called ________________. habitat

4. What is the formula for density?
Population density = number of individuals unit area

5. What are 3 major interaction between organisms?
Competition
Predation
Symbiosis

6. A _____________ is a group of organisms that look alike and can mate with each other to produce offspring. species

7. _____________ is a method in which a scientists count signs of rather than the organisms themselves. Indirect observation

8. A succession after a fire or hurricane is called ____________
A succession after a fire or hurricane is called ____________. Secondary succession

9. ________________ is a relationship in which one species benefit and the other species is neither helped or harmed.
Commensalism

10. ____________ is favorable characteristics that makes an animal survive better in an environment and reproduce. Natural selection

11. All the different populations living together in an area make up ____________. community

12. An relationship between tick and cow represents ___________________.
Parasitism

13. There are 5 abiotic factors: _____________, ____________, _____________, ______________ and _____________. Water, sunlight, oxygen, temperature, soil

14. __________________ is an environmental factor that causes a population to stop growing. Limiting factor

15. In general, which of the following is a true statement about population size?
If birth rate < death rate, population size increases.
If death rate < birth rate, population size decreases.
If birth rate > death rate, population size increases.
If death rate > birth rate, population size increases.

16. Which one of the following is a biotic factor?
Willow tree
Soil
Water
Air

17. A prairie dog, a hawk, a deer all are members of the same:
Niche
Community
Species
Population

18. A process in where plants make their own food using Sun, water and CO2 is called:
Population
Habitat
Photosynthesis
Chemosynthesis

19. All of the following are examples of limiting factors for populations except:
Space
Food
Time
Weather

20. Which one of the following is an abiotic factor?
Worm
Rose
Water
Elephant

21. Photosynthesis needs 3 materials. What 3 materials are needed?
Water, CO2, Sun
Water, Sun, O2
Sun, rain, O2
CO2, O2, water, light

22. What is a species? An individual single living thing
All the different populations that live together in an area
A group is organisms that are similar and can mate with each other
All the members of one species in a specific area

23. Which one of the following statements reflect predator adaptations?
Imitating other dangerous animals
Bacteria and algae living together as lichens
Jellyfish poisoning water animals to paralyze them
Skunk releasing bad smell

24. A way of counting all the members is called:
Direct observation
Indirect observation
Sampling
Mark-and-recapture studies

25. Which equality is expressed correctly?
23 > -11
0.5 < 0.02
.75 < 1
15- 4 >

26. Moving into a population is:
Immigration
Emigration
Population density
Carrying capacity

27. Carrying capacity is: The smallest area that can support animals
The largest population that an area can support
The factor that causes a population to stop growing
The birth rate in which animals are born in a specific time frame

28. There are 39 black labs (dogs) in an area measuring 10m2
There are 39 black labs (dogs) in an area measuring 10m2. What is its population density?
39 black labs/10m2
39 black labs/m2
30 black labs/cm2
3.9 black labs/m2

29. In sampling method: All members are counted
An estimate of population is made
Signs of organisms are counted than the organisms themselves
A scientists counts animals, marks them, returns and recaptures them again later

30. The birth rate is:
Is the number of immigrated members of populations in a certain amount of time
Is the number of births in a populations in a certain amount of time
Is the number of deaths in a populations in a certain amount of time
Is the number of emigrated members of populations in a certain amount of time

31. A method in where a scientist use an estimate is called:
Direct observation
Indirect observation
Sampling
Mark-and-recapture studies

32. Why is the primary succession slow?
Because it takes more time to break up bare soil by moss, lichens, fungi and algae.

33. Calculating: Suppose a population of 100 elephant has produced 700 young. If 150 elephants have died, how many mice are in the population now?
= 800 elephants (parents and children) 800 – 150 died = 650 elephants are now in the population

34. A vampire bat drinks the blood of horses
A vampire bat drinks the blood of horses. What kind of interaction is that?.
Parasitism- because the bat benefits (drinks blood) and the horses are harmed (hurt).

35. What is photosynthesis? Why is it so important to living things?
Photosynthesis is a process in which plants make their own food using Sun, water and CO2. It’s important because it provides oxygen to animals and people.

36. Oxpeckers (birds) eat ticks that live on hippo’s skin
Oxpeckers (birds) eat ticks that live on hippo’s skin. What kind of interaction is that?
Mutualism- oxpeckers get food from ticks on hippo and hippo feels better that there are no ticks on his skin.

37. Give examples of biotic factors.
-dog -cat -horse -worm -bug

38. What are 4 ways to determine population size?
-direct observation -indirect observation -sampling -mark-and-recapture studies

39. What happens to the population if death rate > birth rate?
The population size will decrease (go down).

40. Which population is higher in 1965?
Wolves

41. Based on the graph, in which year the number of wolves declined sharply?
1980

42. Explain why water and sunlight are two abiotic factors that are important to most organisms.
Water is important for basic life processes like breathing, eating etc. Also, it’s important for photosynthesis. Sunlight is also needed for photosynthesis. Plants will not grow in dark areas.

43. What are different reasons why a population size decreased?
Death
Emigration
Disease
Predation
Limited food
Overcrowding