Which one of the following statements is not correct ?

Options

A. DDT and BHC are not good insecticides because they are highly soluable in water.
B. DDT and BHC are not good insecticides because they are absobed by the soil and contaminate root crops .
C. Aldrin is not a good insecticide because it is not biodegradable .
D. All the above are incorrect .

Answer

To solve the question "Which one of the following statements is not correct?", we will analyze each option provided in the question step by step.

### Step 1: Analyze Option A
**Statement:** DDT and BHC are not good insecticides because they are highly soluble in water.

- **Analysis:** DDT (Dichlorodiphenyltrichloroethane) and BHC (Benzene Hexachloride) are known for their effectiveness as insecticides. Their high solubility in water is actually a factor that contributes to their efficacy as insecticides, allowing them to be easily absorbed by insects. Therefore, this statement is incorrect.

### Step 2: Analyze Option B
**Statement:** DDT and BHC are not good insecticides because they are absorbed by the soil and contaminate root crops.

- **Analysis:** This statement highlights a valid concern regarding the environmental impact of DDT and BHC. These compounds can indeed be absorbed by the soil and can lead to contamination of root crops, which raises issues regarding their safety and effectiveness as insecticides. Thus, this statement is correct.

### Step 3: Analyze Option C
**Statement:** Aldrin is not a good insecticide because it is not biodegradable.

- **Analysis:** Aldrin is known for its persistence in the environment due to its non-biodegradable nature. This characteristic leads to accumulation in the ecosystem, making it a poor choice for an insecticide in terms of environmental safety. Therefore, this statement is also correct.

### Step 4: Analyze Option D
**Statement:** All of the above are incorrect.

- **Analysis:** Since we have identified that Options B and C are correct, this statement (Option D) is also incorrect.

### Conclusion
Based on the analysis, the statement that is not correct is **Option A**: "DDT and BHC are not good insecticides because they are highly soluble in water."

### Final Answer
**The incorrect statement is Option A.**

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