Practice question

MCQ

Question

Given below are Assertion (A) and Reasoning (R) Assertion (A) : The Western Hemisphere was eliminated of polio viruses by 1990 as a result of immunization program. Reasoning (R) : Introduction of two poliovirus vaccines (inactivated poliovirus vaccine IPV and oral poliovirus vaccine OPV) to the population from 1955–1963 led to the elimination. Choose the correct answer from the options below:

Options

Choose one · Correct answer highlighted

Both (A) and (R) are true, but (R) is the correct explanation of (A) Correct Both (A) and (R) are true, but (R) is not the correct explanation of (A) (A) is true, but (R) is false (A) is false, but (R) is true

Explanation

IPV introduced 1955 induced humoral immunity, followed by OPV 1961 providing intestinal immunity and community spread. Mass campaigns across Americas achieved high coverage interrupting transmission. PAHO declared polio eliminated in Western Hemisphere in 1994 certification, validating combined vaccine strategy's success from 1955-1963 rollout.

Share this question

Discussion

Comments

0 comments

Please log in to join the discussion.

No comments yet. Be the first to start the discussion.

Related blogs

Guides and insights connected to this topic

Biology XII Lab Manual 10 Oct 2026

Experiment 16: Flash Cards / Models / Specimens Showing Examples of Homologous and Analogous Organs

AIM To study homology and analogy with the help of models/charts of animals and models/charts/specimens of plants. PRINCIPLE Homologous organs are functionally dissimilar but anatomically or structurally similar. Different modes of life have modified the organs to enable survival...

Biology XII Lab Manual 10 Oct 2026

Experiment 15: Identification and Study of Symbiotic Associations (Root Nodules of Leguminous Plants, Lichens) and Parasitism (Cuscuta on Host)

AIM To observe model specimen showing symbiotic association in root nodules of leguminous plants, Cuscuta on host, lichens. PRINCIPLE Symbiosis is close association between two different organisms where at least one is benefited. It includes mutualism where both are benefited, pa...

Biology XII Lab Manual 10 Oct 2026

Experiment 14: Identification of Disease-Causing Organisms (Ascaris, Entamoeba, Plasmodium, and Ringworms)

AIM To identify common human disease causing organisms like Ascaris, Entamoeba, Plasmodium and ringworms through permanent slides or specimens. PRINCIPLE Human diseases are caused by various pathogens including protozoans, helminths and fungi. Identification is based on morpholog...

Practice question

Options

Explanation

Comments

Related blogs

Experiment 16: Flash Cards / Models / Specimens Showing Examples of Homologous and Analogous Organs

Experiment 15: Identification and Study of Symbiotic Associations (Root Nodules of Leguminous Plants, Lichens) and Parasitism (Cuscuta on Host)

Experiment 14: Identification of Disease-Causing Organisms (Ascaris, Entamoeba, Plasmodium, and Ringworms)

Install Examtube

Please allow advertisements on this page