Transport in Humans Quiz - CBSE Class 7 Science
Free practice quiz: Transport in Humans (CBSE Class 7 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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What is the main function of blood in the human body?
- To transport nutrients and oxygen
- To create energy
- To store waste materials
- To regulate body temperature
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Answer: A. To transport nutrients and oxygen
Blood primarily functions to transport nutrients and oxygen to different parts of the body while also removing waste products.
What role do platelets play in the human body?
- Fighting infections
- Transporting nutrients
- Clotting blood
- Carrying oxygen
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Answer: C. Clotting blood
Platelets are involved in blood clotting, which prevents excessive bleeding when we have injuries.
What is the main function of the circulatory system?
- To produce digestive enzymes
- To transport gases and nutrients
- To store fats
- To transmit nerve signals
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Answer: B. To transport gases and nutrients
The circulatory system's primary role is to transport oxygen, carbon dioxide, nutrients, and waste products throughout the body.
Which of the following is a property of capillaries in the circulatory system?
- Thick muscular walls
- Large diameter
- Extensive network reaching cells
- Direct connections to the heart
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Answer: C. Extensive network reaching cells
Capillaries are fine blood vessels that form a network which allows the exchange of nutrients, gases, and wastes with tissues.
Which valve prevents backflow of blood from the aorta to the heart?
- Bicuspid valve
- Tricuspid valve
- Pulmonary valve
- Aortic valve
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Answer: D. Aortic valve
The aortic valve prevents the backflow of blood into the left ventricle after it has been pumped into the aorta.