In living organisms, the body is organized in a hierarchical manner to perform various functions efficiently. This chapter explores the levels of organization, starting from simple cells to complex organ systems. Students will learn how cells group to form tissues, tissues combine to create organs, and organs work together in organ systems to maintain life processes.
Key topics include:
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Levels of Organization – Understanding how life is structured from cells to systems.
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Organs and Organ in Plants – Exploring how plant organs like roots, stems, and leaves perform specific functions.
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Organs and Organ Systems in Humans – Studying human organs and their integration into organ systems for survival.
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Homeostasis – Learning how organisms maintain a stable internal environment despite external changes.
This chapter provides a clear insight into the functional organization of living beings, helping students understand the connection between structure and function in both plants and humans.
📥 Download Chapter 5 Notes – Tissues, Organs, and Organ Systems
Get Class 9 Biology Chapter 5 complete notes for the 2026 new syllabus, including:
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Levels of Organization
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Organs and Organs in Plants
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Organs and Organ Systems in Humans
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Homeostasis
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Important MCQs, Short & Long Questions
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📥 Click to Download Chapter 5 Notes – Tissues, Organs, and Organ Systems
Class 9 Biology Chapter 5 MCQs
1. What is the primary function of the xylem tissue in a leaf?
(a) To transport sugars to other parts
(b) To transport water to parts of leaf
(c) To synthesize chlorophyll
(d) To control the opening and closing of stomata
2. Which structures are responsible for the transport of food in the plant body?
(a) Xylem tissue
(b) Palisade mesophyll
(c) Phloem tissue ✅
(d) Spongy mesophyll
3. What is the smallest level of biological organization?
(a) Cell
(b) Atom ✅
(c) Molecule
(d) Organelle
4. What is the highest level of organization in living things?
(a) Organ
(b) Organ system
(c) Organism ✅
(d) Tissue
5. What is the highest level of organization in living things?
(a) Organ
(b) Organ system
(c) Organism ✅
(d) Tissue
6. The respiratory system helps maintain homeostasis by:
(a) Digesting food
(b) Producing blood cells
(c) Expelling carbon dioxide ✅
(d) Controlling urine