NCERT Important Questions Class 9 Science biology Chapter 13
Important NCERT Extra Questions
Chapter 13 Why do We Fall ill
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
Expand the following abbreviations: (1) PPIP; (2) OPV; (3) NIDS.
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(1) PPIP = Pulse polio immunisation programmes;
(2) OPV = Oral polio vaccine;
(3) NIDS = National immunisations days, e.g.,4 NIDs for PPIP.