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Mind Map: Cell: The Building Block of Life

Mind Map: Cell: The Building Block of Life

The document Mind Map: Cell: The Building Block of Life is a part of the Class 9 Course Science Class 9 New NCERT 2026-27 (New Syllabus).
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FAQs on Mind Map: Cell: The Building Block of Life

1. What are the main components of a cell?
Ans. The main components of a cell include the cell membrane, cytoplasm, and nucleus. The cell membrane acts as a protective barrier, the cytoplasm is the jelly-like substance where cellular processes occur, and the nucleus contains the genetic material, DNA, which controls cell activities.
2. What is the difference between prokaryotic and eukaryotic cells?
Ans. Prokaryotic cells are simpler and smaller, lacking a true nucleus and membrane-bound organelles. They are generally unicellular organisms, such as bacteria. Eukaryotic cells, on the other hand, are larger and more complex, containing a true nucleus and various membrane-bound organelles, and can be unicellular or multicellular, such as plants and animals.
3. How do cells obtain energy?
Ans. Cells obtain energy primarily through the process of cellular respiration, where glucose and oxygen are converted into carbon dioxide, water, and energy (ATP). In plants, energy is also obtained through photosynthesis, where sunlight is converted into chemical energy stored in glucose.
4. What role do organelles play in a cell?
Ans. Organelles are specialised structures within a cell that perform specific functions necessary for the cell's survival and operation. For example, mitochondria are responsible for energy production, ribosomes are involved in protein synthesis, and the endoplasmic reticulum assists in the production and transport of proteins and lipids.
5. Why is the cell membrane important?
Ans. The cell membrane is crucial because it regulates what enters and exits the cell, thus maintaining homeostasis. It provides structural support and protection, and it facilitates communication between cells through receptors that respond to external signals.
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