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Aids to Health — BIOLOGY STD 9 — Question

ICSE BoardEnglish MediumSTD 9BIOLOGYAids to Health2 Marks
Question
List the merits of local defense systems.
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Answer

Merits of local defense systems:
  1. Local defence systems start working instantaneously.
  2. These systems are not dependent on previous exposure to infections.
  3. They are effective against a wide range of potentially infectious agents.

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