Class 9 Exam > Class 9 Notes > Science Class 9 > Mnemonics: The Fundamental Unit of Life
Mnemonics: The Fundamental Unit of Life | Science Class 9 PDF Download
| Table of contents |
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| 1. Cell Discovery & Scientists |
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| 2. Osmosis vs Diffusion |
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| 3. Tonic Solutions |
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| 4. Types of Plastids |
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| 5. Difference between Plant and Animal Cell |
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| 6. Mitosis vs Meiosis |
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1. Cell Discovery & Scientists
Mnemonic: Look Pond, Hook Cell, Brown Nucleus, Perk Proto, Shield Theory, Vick Pre
Mnemonic Explanation
- Leeuwenhoek (1674): Saw living cells in pond water
- Robert Hooke (1665): Discovered cell
- Robert Brown (1831): Discovered nucleus
- Purkinje (1839) : Introduced the term Protoplasm
- Schleiden & Schwann (1838–39): Gave cell theory
- Virchow (1855): Cells from pre-existing cells
2. Osmosis vs Diffusion
Mnemonic: Osmosis Only Moves Water, Diffusion Does All
Mnemonic Explanation
- Osmosis = Movement of water through a semi-permeable membrane
- Diffusion = Movement of molecules (gases/liquids) from high to low concentration
3. Tonic Solutions
Mnemonic: Hypo Swell, Hyper Shrink, Iso Same
Mnemonic Explanation
- Hypotonic → Cell swells (more water outside)
- Hypertonic → Cell shrinks (more water inside)
- Isotonic → Cell size remains same
4. Types of Plastids
Mnemonic: Leuco Stores, Chromo Colour, Chloro Photo
Mnemonic Explanation
- Leucoplast → Stores food
- Chromoplast → Gives colour
- Chloroplast → Performs photosynthesis
5. Difference between Plant and Animal Cell
Mnemonic : Plant CVC and Animal LC
Mnemonic Explanation
- Plant CVC: Organelles which are present in Plant cell not in Animal cell : Chloroplast, Vacuole ( Large ), Cell Wall
Note : Vacuoles are either absent or small in animal cells. - Animal LC : Organelles which are present in Animal cell not in Plant cell : Lysosome, Centriole
6. Mitosis vs Meiosis
Mnemonic: Mitosis Makes Twins, Meiosis Mixes Genes
Mnemonic Explanation
- Mitosis → Two identical cells (growth/repair)
- Meiosis → Four different gametes (reproduction)
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FAQs on Mnemonics: The Fundamental Unit of Life - Science Class 9
| 1. What are the key differences between osmosis and diffusion? |  |
Ans.Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration, while diffusion is the movement of solute particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.
| 2. What are tonic solutions and how do they affect cells? | |
Ans.Tonic solutions are solutions that can be classified as isotonic, hypertonic, or hypotonic based on their solute concentration relative to that of the cell. Isotonic solutions cause no net movement of water, hypertonic solutions cause cells to lose water and shrink, while hypotonic solutions lead to cells gaining water and potentially bursting.
| 3. What are the main types of plastids found in plant cells? | |
Ans.The main types of plastids found in plant cells include chloroplasts (involved in photosynthesis), chromoplasts (which store pigments), and leucoplasts (which store starch, oils, or proteins). Each type has distinct functions and characteristics.
| 4. How do plant and animal cells differ structurally? | |
Ans.Plant cells have a rigid cell wall, chloroplasts for photosynthesis, and large central vacuoles, while animal cells lack a cell wall, do not have chloroplasts, and typically have smaller vacuoles. These structural differences are crucial for their respective functions.
| 5. What is the difference between mitosis and meiosis in cell division? | |
Ans.Mitosis is the process of cell division that results in two genetically identical daughter cells for growth and repair, whereas meiosis is a specialized form of cell division that produces four genetically diverse gametes for sexual reproduction, reducing the chromosome number by half.
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