Assertion (A): Indoor air pollution is a serious health hazard.

Reason (R): The dispersal of air pollutants is rather limited in an indoor environment.

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Assertion (A): All teaching should aim at ensuring learning.
Reason (R): All learning results from teaching.

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Assertion (A): Classroom communication is a transactional process.

Reason (R): A teacher does not operate under the assumption that students' responses are purposive.

Assertion (A): All teaching implies learning.

Reason (R): Learning to be useful must be derived from teaching.

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Directions Each of these questions has an Assertion (A) and a Reason (R).

Assertion (A) India's Republic Day falls on $26$th J anuary.

Reason (R) Constitution of India, declaring India as a 'Republic', came into force on $26$th J anuary $1950.$

Assertion (A): Sustainable development is critical to well being of human society.

Reason (R): Environmentally sound policies do not harm the environment or deplete natural resources.

Assertion (A): In urban areas, smog episodes occur frequently in winters.

Reason (R): In winters, a lot of biomass is burnt by people for heating purpose or to keep themselves warm.

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