Question

The term LD50 in pesticide toxicology refers to:

• A. Kill value
• B. Lethal dose
• C. Hazard rating
• D. Toxicity

Hint:

LD$_{50}$:
- Lethal Dose 50.
- Dose required to kill 50% of test population.
- Lower LD$_{50}$ = Higher toxicity.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
This question tests knowledge of pesticide toxicology terms.

Step 2: Detailed Explanation:
LD$_{50}$ stands for Lethal Dose 50.
It is the dose of a toxic substance required to kill 50% of a test population.
It is a measure of acute toxicity.
Kill value (A): Not a standard term.
Hazard rating (C): Not a standard term.
Toxicity (D): General term for harmful effects.
Thus, LD$_{50}$ refers to lethal dose.

Step 3: Final Answer:
Thus, LD$_{50}$ in pesticide toxicology refers to lethal dose, which corresponds to option (B).
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