To solve the question of selecting the incorrect statement regarding sexually transmitted diseases (STDs), we will analyze each statement provided in the question step by step.
### Step 1: Analyze the First Statement
**Statement 1:** "Other than sexual intercourse, STDs can be transmitted through infected medical devices like needles, infected scalpels, blood transfusion, or from mother to fetus through the placenta."
- This statement is **correct**. STDs can indeed be transmitted through various means other than sexual intercourse, including contaminated medical devices, blood transfusions, and from mother to fetus during pregnancy.
### Step 2: Analyze the Second Statement
**Statement 2:** "Infected females may be asymptomatic and hence may remain undetected for long."
- This statement is also **correct**. Many STDs, including HIV, can be asymptomatic for a long time, meaning that an infected person may not show symptoms and therefore may remain undetected.
### Step 3: Analyze the Third Statement
**Statement 3:** "Failure of timely detection and treatment may lead to ectopic pregnancy."
- This statement is **correct**. Ectopic pregnancy can occur if there are untreated STDs that lead to complications, such as pelvic inflammatory disease, which can affect the fallopian tubes.
### Step 4: Analyze the Fourth Statement
**Statement 4:** "Except HIV, all STDs are completely curable without proper treatment."
- This statement is **incorrect**. While some STDs are curable with treatment (like chlamydia and gonorrhea), there are others, such as hepatitis B and genital herpes, that are not completely curable. Therefore, this statement is misleading as it implies that all STDs except HIV are curable, which is not true.
### Conclusion
After analyzing all four statements, we conclude that the **incorrect statement** is:
**Answer:** Statement 4: "Except HIV, all STDs are completely curable without proper treatment."
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