Organ Systems MCQs Quiz | Class 9
Class IX Science (Code 086), Unit II: Organization in the Living World. This quiz focuses on the topic of Organ Systems, covering their definition and common examples. Test your knowledge by answering the 10 questions below, then submit to check your score and download the comprehensive PDF answer key.
Overview of Organ Systems
In multicellular organisms, cells are organized into tissues, and tissues are organized into organs. An organ system is a group of organs that work together to perform one or more functions. Each organ system has a specific role in the body, and it is made up of certain organs.
Levels of Organization
The hierarchy of organization in living organisms is as follows:
- Cell: The basic unit of life.
- Tissue: A group of similar cells performing a specific function.
- Organ: A structure made of different tissues working together (e.g., heart, stomach).
- Organ System: A group of organs performing a major body function.
- Organism: An individual living being.
Key Human Organ Systems
| System Name | Major Organs | Primary Function |
|---|---|---|
| Digestive | Stomach, Intestines, Liver | Breakdown and absorption of food. |
| Respiratory | Lungs, Trachea | Exchange of oxygen and carbon dioxide. |
| Circulatory | Heart, Blood Vessels | Transport of blood, nutrients, and gases. |
| Nervous | Brain, Spinal Cord | Control and coordination of body activities. |
| Excretory | Kidneys, Bladder | Removal of waste products. |
Plant Organ Systems
Plants also have organ systems, primarily the Root System (underground, absorbs water) and the Shoot System (above ground, performs photosynthesis and reproduction).
Extra Practice Questions
- What is the smallest unit of organization in the human body?
- Name the system responsible for transporting blood.
- Which organ system includes the brain?
- True or False: A tissue is larger than an organ.
- What is the main function of the respiratory system?
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