Question : The main function of the heart is to:
Option 1: supply oxygen to the tissues
Option 2: carry carbon dioxide from the tissues
Option 3: throw away waste materials
Option 4: pump blood to different parts of the body
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Correct Answer: pump blood to different parts of the body
Solution : The correct answer is to pump blood to different parts of the body.
The heart's main function is to pump blood to different parts of the body and it supplies oxygen and nutrients to the tissues, removes carbon dioxide, and waste from the blood, and it also maintains the blood pressure throughout the body.
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Question : _______ are the vessels which carry carbon dioxide-rich blood back to the heart.
Option 1: Veins
Option 2: Neurons
Option 3: Capillaries
Option 4: Arteries
Question : ______ are the vessels which carry blood away from the heart to various organs of the body.
Option 2: Tracheas
Option 3: Arteries
Option 4: Plasma
Question : Which one out of the following helps in burning?
Option 1: Oxygen
Option 2: Carbon monoxide
Option 3: Nitrogen
Option 4: Carbon dioxide
Question : Which of the following gases shields the surface of the Earth from ultraviolet (UV) radiation from the Sun?
Option 1: Carbon monoxide
Option 2: Ozone
Option 3: Oxygen
Question : Dry ice is
Option 1: Solid ammonia
Option 2: Solid sulphur dioxide
Option 3: Dry carbon dioxide
Option 4: Solid carbon dioxide
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