{"id":31526,"date":"2026-05-20T13:20:48","date_gmt":"2026-05-20T07:50:48","guid":{"rendered":"https:\/\/mycbseguide.com\/blog\/?p=31526"},"modified":"2026-05-20T13:21:46","modified_gmt":"2026-05-20T07:51:46","slug":"cell-the-building-block-of-life-ncert-solutions-class-9-science-exploration","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/cell-the-building-block-of-life-ncert-solutions-class-9-science-exploration\/","title":{"rendered":"Cell: The Building Block of Life – NCERT Solutions Class 9 Science Exploration"},"content":{"rendered":"\n

Cell: The Building Block of Life – NCERT Solutions Class 9 Science Exploration includes all the questions with solutions given in NCERT Class 9 Science Exploration<\/a> textbook.<\/p>\n\n\n\n

NCERT Solutions Class 9<\/h2>\n\n\nEnglish Kaveri<\/a>\n\n\nHindi Ganga<\/a>\n\n\nSanskrit Sharada<\/a>\n\n\nMaths Ganita Manjari<\/a>\n\n\nScience Exploration<\/a>\n\n\nSocial Understanding Society<\/a>\n\n\n\n

Entering the World of Secondary Science \u2013 NCERT Solution<\/h2>\n\n\n\n
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Q.1: Where does a cell come from?<\/strong><\/p>\n\n\n\n

Solution: A cell comes from a pre-existing cell through cell division. New cells are formed when existing cells grow and divide, ensuring continuity of life and transmission of genetic material from parent to daughter cells.<\/p>\n\n\n\n

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Q.2: How have technological interventions facilitated the creation of new knowledge in understanding the world beyond the naked eye?<\/strong><\/p>\n\n\n\n

Solution: Technological tools like microscopes have enabled scientists to observe cells, organelles, and microorganisms beyond naked-eye limits. Advances such as electron microscopy and imaging techniques have revealed detailed structures and processes, leading to new knowledge about cell function, disease mechanisms, and life at the microscopic level.<\/p>\n\n\n\n

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Q.3: How is the cell structural and functional unit of life?<\/strong><\/p>\n\n\n\n

Solution: A cell is the structural unit as all organisms are made of cells. It is the functional unit because all vital activities-metabolism, respiration, growth, and reproduction-occur within cells. Thus, cells form the building blocks and carry out essential life processes.<\/p>\n\n\n\n

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Q.4: How does a cell multiply?<\/p>\n\n\n\n

Solution:<\/p>\n\n\n\n

A cell multiplies by cell division. In this process, the parent cell grows, replicates its DNA, and divides into two daughter cells. This occurs through mitosis for growth and repair, ensuring each new cell receives identical genetic material.<\/p>\n\n\n\n

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Q.5: What argument would you give for the necessity of a cell wall in plants usually fixed in one place versus in animals usually moving from one place to the other?<\/strong><\/p>\n\n\n\n

Solution: Plants remain fixed, so a rigid cell wall is necessary for support, protection, and maintaining shape against external forces. Animals are mobile and need flexibility; absence of a cell wall allows cells to change shape, enabling movement and specialized functions.<\/p>\n\n\n\n

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Q.6: What consequences would you predict for a plant cell if its cell wall were to become as flexible as a cell membrane?<\/strong><\/p>\n\n\n\n

Solution: If the cell wall became as flexible as the cell membrane, the plant cell would lose rigidity and shape. It could not withstand turgor pressure, leading to swelling or bursting. The plant would lose structural support, become weak, and may collapse.<\/p>\n\n\n\n

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Q.7: Why is it important to cut the two potato pieces in roughly equal size and measure their initial weight before placing them in different liquids?<\/strong><\/p>\n\n\n\n

Solution: Cutting equal-sized potato pieces and measuring initial weight ensures a fair test in osmosis experiments. It keeps surface area and mass constant, so any change in weight is due only to movement of water, not differences in size, giving accurate and comparable results.<\/p>\n\n\n\n

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Q.8: Do white flowers contain any pigment? Give reasons.<\/strong><\/p>\n\n\n\n

Solution: Yes, white flowers do contain pigments.
White flowers usually lack colored pigments like anthocyanins, but they often contain colorless or very faint pigments (like flavones). Also, their white appearance is mainly due to reflection of all wavelengths of light by air spaces in the petal cells, rather than complete absence of pigments.<\/p>\n\n\n\n

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Q.9: Draw a well-labelled schematic diagram of a plant or an animal cell using these clues-<\/strong><\/p>\n\n\n\n

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  1. Nucleus appears as a dark and round body inside the cell.<\/li>\n\n\n\n
  2. ER spreads like a network of extended nuclear envelope.<\/li>\n\n\n\n
  3. Mitochondria and chloroplasts are rod shaped.<\/li>\n<\/ol>\n\n\n\n

    Solution:<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n
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    Q.10: Instead of many small ones, why does a cell not have a single giant mitochondrion? How does this relate to the concept of surface area?<\/strong><\/p>\n\n\n\n

    Solution: A cell does not have a single giant mitochondrion because it would be inefficient.<\/p>\n\n\n\n

    Reason (Surface Area concept):<\/strong> Many small mitochondria provide a larger total surface area<\/strong> compared to one big mitochondrion of the same volume. Since energy production (ATP formation) occurs on the inner membrane, more surface area \u2192 more energy production<\/strong>.<\/p>\n\n\n\n

    Also, smaller mitochondria allow:<\/p>\n\n\n\n