Which one of the following insecticides is of plant origin

Options

A. Ecdysone
B. Rotenone
C. Parathion
D. Malathion

Answer

To determine which insecticide is of plant origin from the given options, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A) Egg dyson
- B) Rotenone
- C) Parathion
- D) Malathion

2. **Analyze Option A - Egg Dyson**:
- Egg dyson is a naturally occurring steroidal hormone found in insects.
- It plays a role in stimulating metamorphosis and regulating molting in insects.
- Since it is not derived from plants but is found in insects, it is not of plant origin.

**Hint**: Look for the source of the substance; if it is found in insects, it is not plant-derived.

3. **Analyze Option B - Rotenone**:
- Rotenone is a broad-spectrum insecticide, pesticide, and piscicide (used to kill fish).
- It occurs naturally in the stems and seeds of several plants.
- Since it is derived from plants, it is of plant origin.

**Hint**: Check if the insecticide is derived from plant materials; if yes, it is likely the correct answer.

4. **Analyze Option C - Parathion**:
- Parathion is an organophosphate pesticide.
- It is synthesized from chemical processes and is not derived from plants.
- Therefore, it does not have plant origin.

**Hint**: If the substance is manmade or synthesized from chemicals, it is not of plant origin.

5. **Analyze Option D - Malathion**:
- Malathion is also an organophosphate pesticide.
- It is fully manmade and synthesized, not derived from any plant source.
- Hence, it is not of plant origin.

**Hint**: Similar to parathion, if it is fully synthetic, it cannot be of plant origin.

6. **Conclusion**:
- After analyzing all options, the only insecticide that is of plant origin is **Rotenone (Option B)**.

### Final Answer:
The insecticide of plant origin is **B) Rotenone**.