LD 50 Toxicology Trees Timber Harvesting Grab Bag
LD Question ED 50 Stands for what?
LD Answer Effective Dose 50%
LD 50 Question 200 Is the chemical safe for 100% of the population?
LD answer No. There is no safe limit/no threshold.
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
LD answer A) amount of toxicant it takes to kill half the population
LD 50 Question 400 Hidden behind the box is the word?
LD answer Threshold
LD 50 Question 500 Which chemical below could you take some of and be certain that it would not kill you?
LD answer Chemical B
Toxicology 100 ________ are best defined as substances that cause cancer. A) Allergens B) Teratogens C) Carcinogens D) Neurotoxins E) Vectors
Toxicology 100 answer C) Carcinogens
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
Toxicology 200 answer B) endocrine disruptors
Toxicology 300 Finish the following: The _____ equals the poison.
Toxicology 300 answer Dose
Toxicology 400 This chemical mimics estrogen and is used in plastic manufacturing
Toxicology 400 answer BPA or Bisphenol-A
Toxicology 500 What percentage of deaths in developing countries is from infectious diseases?
Toxicology 500 answer 50%
Trees 100 Question Extracting the maximum amount of resources from the land without depleting that resource is called.
Trees 100 Answer Maximum Sustainable Yeild
Trees 200 Question Forests cover what % of Earth’s land? A. 10% B. 20% C. 30% D. 40% E. 50%
Trees 200 Answer C. 30 %
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
Trees 300 Answer Canada, Russia, and Brazil
Trees 400 Question Which one of the following is the most restrictive in terms of land use? A.National Forest Land B.BLM land C.Wilderness Lands D.National Park Land E.National Wildlife Refuge
Trees 400 Answer D. National Park Land
Trees 500 Question This tree shown in the video Fire Wars is dependent upon fire for it’s survival?
Trees 500 Answer Redwood/Sequoia
Timber Harvesting 100 Question Completely removing all the trees from an area is called
Timber Harvesting 100 Answer Clear Cutting
Timber Harvesting 200 Question Leaving a few trees behind that are of reproductive age is called this type of timber harvesting.
Timber Harvesting 200 Answer Seed Tree Cutting
Timber Harvesting 300 Question Small Number of trees are left in place to provide shelter for other trees.
Timber Harvesting 300 Answer Shelterwood
Timber Harvesting 400 Question Old Trees are cut and removed to provide room for younger trees.
Timber Harvesting 400 Answer Selective Cutting
Timber Harvesting 500 Question Name two disadvantages of fire suppression.
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
100 Grab Bag Question What does MSDS stand for?
100 Grab Bag Answer Material Safety Data Sheet
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%
Grab Bag 200 Answer c.Approximately 20-30
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?
Grab Bag 300 Answer 450 grams
Grab Bag 400 Question Who said the dosage makes it either a poison or a remedy?
Grab Bag 400 Answer Paracelsus
Grab Bag 500 Question What five-letter word becomes shorter when you add two letters to it?