Category: Class 9 Science

NCERT Solutions for Class 9 Science for CBSE exams 2020-2021.

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Cells use lysosomes to break down waste materials and damaged organelles. These enzymes digest unwanted substances, preventing accumulation and keeping the cell clean and functioning properly.

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The cell membrane surrounds all cells and controls movement of substances. It is selectively permeable, allowing some materials to enter or leave, while protecting and maintaining the cell’s internal environment.

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The cell interior contains cytoplasm, nucleus and organelles that work together. Each part performs specific functions, coordinating activities like energy production, transport and control, ensuring proper functioning of the cell.