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Solutions ⇒ Class 9th ⇒ Science ⇒ 5. The Fundamental Unit of Life

Solutions 5. The Fundamental Unit of Life - Chapter Review | Class 9 Science - Toppers Study

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Solutions 5. The Fundamental Unit of Life - Chapter Review | Class 9 Science - Toppers Study

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Chapter 5 Science class 9

Chapter Review class 9 Science Chapter 5. The Fundamental Unit of Life

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  • Solutions 5. The Fundamental Unit Of Life - Chapter Review | Class 9 Science - Toppers Study
  • Class 9 Ncert Solutions
  • Solution Chapter 5. The Fundamental Unit Of Life Class 9
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  • Chapter 5. The Fundamental Unit Of Life Chapter Review Class 9

5. The Fundamental Unit of Life

| Chapter Review |

Solutions 5. The Fundamental Unit of Life - Chapter Review | Class 9 Science - Toppers Study


Chapter Review:


  • The fundamental organisational unit of life is called cell.
  • Cells were first discovered by Robert Hooke in 1665.
  • The movement of water molecules through such a selectively permeable membrane is called osmosis.
  • The plasma membrane is flexible and is made up of organic molecules called lipids
    and proteins.
  • Nucleus is a largest cell organelle which consists inside the cell. Nuclei are found in all eukaryotic cells. It contains chromatin. Nucleus is a largest cell organelle which consists inside the cell. Nuclei are found in all eukaryotic cells. It contains chromatin. 
  • Cellulose is a complex substance and provides structural strength to plants.
  • The nucleus has a double layered covering called nuclear membrane.
  • Functional segments of DNA are called genes.
  • Mitochondria are known as the powerhouses of the cell.
  • ATP is known as the energy currency of the cell.
  • The internal organisation of the plastids consists of numerous membrane layers embedded in a material called the stroma.
  • Most plant cells have large membranous organelles called plastids, which are of two types – chromoplasts and leucoplasts.
  • Chromoplasts that contain chlorophyll are called chloroplasts and they perform photosynthesis.
  • Most mature plant cells have a large central vacuole that helps to maintain the turgidity of the cell and stores important substances including wastes.
  • If the medium surrounding the cell has a higher water concentration than the cell is known as hypotonic solution.
  • If the medium has exactly same water concentration than the cell is known as isotonic solution.
  • If the medium surrounding the cell has a lower concentration then the cell is known as hypertonic solution.

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Solutions ⇒ Class 9th ⇒ Science
1. Matter in Our Surroundings
2. Is Matter around us Pure
3. Atoms and Molecules
4. Structure of The Atom
5. The Fundamental Unit of Life
6. Tissues
7. Diversity in Living Organisms
8. Motion
9. Force and Laws of Motion
10. Gravitation
11. Work and Energy
12. Sound
13. Why Do We Fall ill
14. Natural Resources
15. Improvement in Food Resources

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