1. LD 50
Toxicology
Trees
Timber
Harvesting
Grab
Bag
100
100
100
100
100
200
200
200
200
200
300
300
300
300
300
400
400
400
400
400
500
500
500
500
500

2. LD Question
ED 50 Stands for what?

3. LD Answer
Effective Dose 50%

4. Is the chemical safe for 100% of the population?
LD 50 Question 200
Is the chemical safe for 100% of the population?

5. No. There is no safe limit/no threshold.
LD answer
No. There is no safe limit/no threshold.

6. LD 50 Question 300 The LD50 indicates the ________.
A) amount of toxicant it takes to kill half the population
B) lowest dose that kills any member of the population
C) lowest dose that kills 50 out of 1000 members of the population
D) lowest dose required to cure half of the population
E) lowest dose required to cure the entire population

7. A) amount of toxicant it takes to kill half the population
LD answer
A) amount of toxicant it takes to kill half the population

8. Hidden behind the box is the word?
LD 50 Question 400
Hidden behind the box is the word?

9. LD answer
Threshold

10. LD 50 Question 500
Which chemical below could you take some of and be certain that it would not kill you?

11. LD answer
Chemical B

12. ________ are best defined as substances that cause cancer.
Toxicology 100
________ are best defined as substances that cause cancer.
A) Allergens
B) Teratogens
C) Carcinogens
D) Neurotoxins
E) Vectors

13. Toxicology 100 answer
C) Carcinogens

14. B) endocrine disruptors
Toxicology 200
The worldwide drop in sperm counts among men has been attributed to ________.
A) DDT
B) endocrine disruptors
C) teratogens
D) radon
E) allergens

15. B) endocrine disruptors
Toxicology 200 answer
B) endocrine disruptors

16. Finish the following: The _____ equals the poison.
Toxicology 300
Finish the following:
The _____ equals the poison.

17. Toxicology 300 answer
Dose

18. This chemical mimics estrogen and is used in plastic manufacturing
Toxicology 400
This chemical mimics estrogen and is used in plastic manufacturing

19. Toxicology 400 answer
BPA or Bisphenol-A

20. Toxicology 500
What percentage of deaths in developing countries is from infectious diseases?

21. Toxicology 500 answer
50%

22. Trees 100 Question
Extracting the maximum amount of resources from the land without depleting that resource is called.

23. Maximum Sustainable Yeild
Trees 100 Answer
Maximum Sustainable Yeild

24. Forests cover what % of Earth’s land?
Trees 200 Question
Forests cover what % of Earth’s land?
A. 10% B. 20% C. 30% D. 40% E. 50%

25. Trees 200 Answer
C. 30 %

26. Trees 300 Question
Most commercial logging today takes place in ________.
a. Europe
b. Canada, Russia, and Brazil
c. the United States
d. Australia
e. Mexico

27. Canada, Russia, and Brazil
Trees 300 Answer
Canada, Russia, and Brazil

28. Trees 400 Question
Which one of the following is the most restrictive in terms of land use?
National Forest Land
BLM land
Wilderness Lands
National Park Land
National Wildlife Refuge

29. Trees 400 Answer
D. National Park Land

30. Trees 500 Question
This tree shown in the video Fire Wars is dependent upon fire for it’s survival?

31. Trees 500 Answer
Redwood/Sequoia

32. Timber Harvesting 100 Question
Completely removing all the trees from an area is called

33. Timber Harvesting 100 Answer
Clear Cutting

34. Timber Harvesting 200 Question
Leaving a few trees behind that are of reproductive age is called this type of timber harvesting.

35. Timber Harvesting 200 Answer
Seed Tree Cutting

36. Timber Harvesting 300 Question
Small Number of trees are left in place to provide shelter for other trees.

37. Timber Harvesting 300 Answer
Shelterwood

38. Timber Harvesting 400 Question
Old Trees are cut and removed to provide room for younger trees.

39. Timber Harvesting 400 Answer
Selective Cutting

40. Timber Harvesting 500 Question
Name two disadvantages of fire suppression.

41. Timber Harvesting 500 Answer
Changes ecosystems: denser forests
Less diversity
Weak trees don’t die
Plants that germinate with fire don’t spread and any species dependent upon them don’t survive
Larger fires that cannot be controlled by humans
Allows pests to spread

42. What does MSDS stand for?
100 Grab Bag Question
What does MSDS stand for?

43. Material Safety Data Sheet
100 Grab Bag Answer
Material Safety Data Sheet

44. What amount of land worldwide is used for agriculture?
Grab Bag 200 Question
What amount of land worldwide is used for agriculture?
a. Less than 5%
b. Approximately 5-10%
c. Approximately 20-30%
d. Almost 40%
e. Almost 50%

45. Grab Bag 200 Answer
c. Approximately 20-30

46. Grab Bag 300 Question
John weighs in at 150 kg and chemical X has a toxicity of 3 g/kg. What is the LD50 of this chemical for John?

47. Grab Bag 300 Answer
450 grams

48. Who said the dosage makes it either a poison or a remedy?
Grab Bag 400 Question
Who said the dosage makes it either a poison or a remedy?

49. Grab Bag 400 Answer
Paracelsus

50. What five-letter word becomes shorter when you add two letters to it?
Grab Bag 500 Question
What five-letter word becomes shorter when you add two letters to it?

51. Grab Bag 500 Answer
Short