CPA Pesticide Toxicology and Mode of Action 3

Question 1

Diamide insecticides such as chlorantraniliprole control insects through which mode of action?

Accepted Answer

Ryanodine receptor activation causing uncontrolled muscle contraction

Answer

Acetylcholinesterase inhibition

Answer

Nicotinic acetylcholine receptor activation

Answer

Voltage-gated sodium channel blocking

Question 2

Which signal word appears on a pesticide label when the product falls into EPA Toxicity Category II (moderately toxic)?

Accepted Answer

WARNING

Answer

DANGER

Answer

CAUTION

Answer

NOTICE

Question 3

Glyphosate herbicide kills plants by inhibiting which enzyme critical to amino acid biosynthesis?

Accepted Answer

EPSPS (5-enolpyruvylshikimate-3-phosphate synthase)

Answer

Acetolactate synthase (ALS)

Answer

Protoporphyrinogen oxidase (PPO)

Answer

Acetyl-CoA carboxylase (ACCase)

Question 4

Chronic pesticide toxicity refers to adverse health effects that result from:

Accepted Answer

Repeated or prolonged exposures over an extended period of time

Answer

A single large dose causing immediate symptoms

Answer

Skin-only exposure during a single application event

Answer

One-time inhalation of pesticide vapors

Question 5

Hepatotoxic pesticides primarily target which organ in exposed individuals?

Accepted Answer

Liver

Answer

Kidney

Answer

Brain

Answer

Lung

Question 6

The IRAC (Insecticide Resistance Action Committee) classification system groups insecticides according to their:

Accepted Answer

Mode of action (target site)

Answer

Chemical family name only

Answer

Country of first registration

Answer

Method of field application

Question 7

In the context of pyrethroid insecticides, what does the term 'knockdown effect' describe?

Accepted Answer

Rapid immobilization of insects shortly after exposure

Answer

Slow systemic killing over several days after ingestion

Answer

Long-lasting residual soil activity persisting for weeks

Answer

A delayed lethal effect triggered by sunlight breakdown