Q4. List three possible STI symptoms; must symptoms always occur?
Any three: itching, discharge, pain or genital swelling (NCERT page 47). Many infections are asymptomatic, so symptoms alone cannot rule infection in or out.
Q5. Assertion: infected females may remain undetected for long. Reason: they may often be asymptomatic. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion (NCERT page 47).
Q6. Name three complications of STIs that are not detected and treated in time.
Any three of pelvic inflammatory diseases (PID), abortions, still births, ectopic pregnancies, infertility and cancer of the reproductive tract (NCERT page 47).
Q7. Why does disappearance of genital warts after treatment not prove that HPV infection was eradicated?
Treatment removes the lesions, whereas direct eradication of the virus is a different outcome. Many HPV infections clear naturally, but lesion treatment alone does not establish viral clearance.