Question

1. Truth or false

1. Risk assessment involves (1) hazard identification or evaluation, (2) dose-repsonse evaluation, (3) exposure evaluation, and (4) risk characterization.

2. Exposure routes include respiration, dermal contact, and oral intake.

3. Volatility and bioconcentration quickly reduce a substance’s availability, while dissolution and adsorption often prolong it.

4. Contact frequency is not related to exposure at all.

5. Approximately 50% of our population is exposed to toxic chemicals.

6. Uncertainty is an uncommon feature of risk characterization.

7. Assessment of ecological risk follows different steps as that for humans.

8. Risk assessment involves dose-response extrapolations.

9. Metabolism and disposition of drugs often are not related to physiological time and development.

10. Ecosystems possess energy and material flows, biogeochemical cycling, nutrient retention and an ability to resist changes and detoxify pollutants.

11. Risk management considers only risk, but not benefits.

Answer 1

As you have not specified any specific question so I am answering according to the chegg guidelines. Please cooperate.

Answer A

False

As risk assessment involves hazard identification, dose response evaluation, risk characterization and at last hazard elimination.

Answer B

False

As exposure routes includes :

Inhalation

skin

absorption

ingestion

injection

Answer C

False

As volatility, and hydrolysis will reduce the concentration and substance availability at the time during which a substance is available for bioconcentration.

Answer D

True

Contact frequency are related to exposure.