Human body systems Quiz - ICSE Class 7 Science
Free practice quiz: Human body systems (ICSE Class 7 Science). 53 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is the primary site of nutrient absorption in the human digestive system?
- Stomach
- Small intestine
- Large intestine
- Esophagus
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Answer: B. Small intestine
The small intestine, with its vast surface area due to villi and microvilli, is specialized for the absorption of digested nutrients into the bloodstream.
The central nervous system consists of the:
- Brain and spinal cord
- Brain and nerves
- Spinal cord and nerves
- All of the above
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Answer: A. Brain and spinal cord
The central nervous system (CNS) is the command center of the body, comprising the brain, which processes information and controls actions, and the spinal cord, which transmits signals between the brain and the rest of the body.
What are the small, finger-like projections that line the small intestine and increase its surface area for nutrient absorption?
- Cilia
- Flagella
- Villi
- Microbes
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Answer: C. Villi
Villi are microscopic, finger-like projections that greatly increase the surface area of the small intestine's lining, maximizing the efficiency of nutrient absorption.
The pigment in red blood cells that binds to and transports oxygen is called:
- Albumin
- Hemoglobin
- Globulin
- Fibrinogen
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Answer: B. Hemoglobin
Hemoglobin is a protein found in red blood cells that contains iron. This iron atom allows hemoglobin to bind to oxygen in the lungs and transport it to the body's tissues.
What is the primary function of platelets in the blood?
- Transporting oxygen
- Defending against pathogens
- Carrying nutrients
- Aiding in blood clotting
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Answer: D. Aiding in blood clotting
Platelets are small, irregular-shaped cell fragments that play a critical role in hemostasis, the process of stopping bleeding. They aggregate at the site of injury and form a plug, initiating the blood clotting cascade.