The Fundamental Unit of Life
Jharkhand Board · Class 9 · Science
Flashcards for The Fundamental Unit of Life — Jharkhand Board Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedWho first discovered cells and what did he observe?
Answer
Robert Hooke first discovered cells in 1665. He observed a thin slice of cork under a microscope and saw small compartments that looked like a honeycomb structure. He called these compartments 'cells'…
What is a cell?
Answer
A cell is the smallest structural and functional unit of life. It is the basic building block of all living organisms. All living things are made up of one or more cells.
What is the difference between unicellular and multicellular organisms? Give examples.
Answer
Unicellular organisms: Made of only one cell (e.g., Amoeba, Paramecium, bacteria). Multicellular organisms: Made of many cells working together (e.g., plants, animals, fungi). All multicellular organi…
What are the three main components found in almost every cell?
Answer
1. Plasma membrane (cell membrane) - outer covering 2. Nucleus - control center containing genetic material 3. Cytoplasm - jelly-like substance filling the cell…
What is the plasma membrane and what is its main function?
Answer
The plasma membrane is the outermost covering of the cell made of lipids and proteins. Its main function is to control what enters and exits the cell. It is selectively permeable, allowing some substa…
What is diffusion and how does it help cells?
Answer
Diffusion is the movement of substances from an area of high concentration to an area of low concentration. In cells, it helps exchange gases like oxygen and carbon dioxide across the cell membrane wi…
What is osmosis?
Answer
Osmosis is the movement of water molecules through a selectively permeable membrane from an area of higher water concentration to an area of lower water concentration. It is a special type of diffusio…
What happens to a cell in hypotonic, isotonic, and hypertonic solutions?
Answer
Hypotonic (dilute): Cell gains water and swells up Isotonic (equal concentration): No net water movement, cell stays same size Hypertonic (concentrated): Cell loses water and shrinks…
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