Dose Response Curves

Dose causing death of half of the organisms exposed at this level.

• LD₅₀

• LC₅₀

• TC₅₀

• TD₅₀

Indicates how poisonous a substance is to biological organisms

• toxicity

• acute effects

• chronic effects

• bioaccumulation

Which of the following statement about the LD50 is correct?

• The more toxic a substance is, the higer its LD50 would be
• LD50 is a measurement to COMPARE the toxicity with other substances
• LD50 stands for Lethal dose 50
• LD50 stands for Lethal dose 50 mg/L

Which of the following concentrations is higher?

• 0.2 ppm

• 2.2 ppm

• 20.2 ppm

• 200 ppm

What is more dangerous LD50 of

• 0.04 ppm

• 1.29 ppm

• 1.04 ppm

• 0.40 ppm

Caffine has an LD50 of 130ppm for mice. Which is the best reason that coffee and caffinated soft drinks are not considered dangerous?

• Caffine is only toxic to mice and not to humans

• You would have to drink an enormous amounts of caffinated drinks to consume a dose that would amount to that concentration

• LD50 is a rating only used for mice.

• Caffine is popular, so a high toxicity is acceptable.

Arrange the following chemicals from most to least toxic: dioxin, nicotine, botulinum toxin A, dieldren.

• Dieldren, dioxin, nicotine, botulinum toxin A

• Dieldren, nicotine, dioxin, botulinum toxin A

• Botulinum toxin A, nicotine, dioxin, dieldren

• Botulinum toxin A, dioxin, nicotine, dieldren

Tags

NGSS.HS-PS1-5

Total amount of chemical that an individual eats, drinks, breathes, or absorbs through the skin.

• exposure

• dose

• toxicity

• degradation

What is the LD50 for Toxin B?

• 10 mg
• 13 mg
• 25 mg
• 50 mg

Which toxin is the most lethal?

• Toxin A
• Toxin B