Cell Basics: 16 flashcards
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1. Why is the cell considered the basic unit of life?
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Because it is the smallest unit capable of performing all vital life functions independently, not merely because it is the smallest structure.
2. What are the two roles of the cell in living organisms?
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Structural unit (forming tissues, organs, organ systems) and functional unit (performing processes like digestion, respiration, excretion).
3. Who discovered the cell and in which year?
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Robert Hooke in 1665.
4. What is the structural hierarchy of organization in multicellular organisms?
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Cell → Tissue → Organ → Organ System → Organism.
5. What does 'functional unit' mean in the context of cells?
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It means the cell performs essential life processes such as digestion, respiration, and excretion.
6. On what bases do cells vary from each other?
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Number, shape, and size.
7. Why can unicellular organisms survive as a single cell?
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Because a single cell can perform all vital life functions independently.
8. What is the structural role of a cell?
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It provides structure to the body by forming tissues, organs, and organ systems.
9. Give an example of a functional process performed by cells.
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Digestion, respiration, or excretion.
10. True or False: The cell is the basic unit of life because it is the smallest structure in the body.
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False. It is because it is the smallest unit capable of performing all vital life functions independently.
11. What are the three bases of variation among different types of cells?
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Number, shape, and size.
12. What did Robert Hooke observe when he discovered the cell?
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He observed cells (the term 'cell' was coined by him) in 1665.
13. What is the relationship between cells and tissues?
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Cells group together to form tissues.
14. What is the relationship between organs and organ systems?
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Organs work together to form organ systems.
15. Why is the cell called the structural unit of life?
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Because it is the building block that forms tissues, organs, and organ systems, giving the organism its structure.
16. Why is the cell called the functional unit of life?
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Because it performs vital life processes like digestion, respiration, and excretion.
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