Ventilators are provided at the top of room

To bring oxygen for breathing

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So that sunlight may enter the room

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To maintain convectional currents to keep the air fresh in the room

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To provide an outlet for carbon dioxide

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Solution

The correct option is C To maintain convectional currents to keep the air fresh in the room
Ventilators are provided in the rooms at the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through these ventilators and thus cool air remains at bottom. It brings cool and fresh air in the room. Thus ventilators maintain conventional currents to keep the air fresh in the room.

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Similar questions

Q. Why are ventilators in houses provided at the top of walls?

Q. How do the roots of land plants get oxygen for breathing?

Breathing is a process that
(i) Provides oxygen to the body.
(ii) Breaks down food to release energy.
(iii) Helps the body to get rid of carbon dioxide.
(iv) provides nitrogen to the body
Which of the following correctly defines the functions of breathing?

Assertion (A): Avicennia roots are erect, peg like structures with numerous pores through which air circulates.
Reason (R): These roots are seen above the ground for the purpose of gaseous exchange called as breathing roots, or pneumatophores.

Ploughing or tilling of the soil creates tiny air space around soil particles and provides the source of __________ for the roots.

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