Class 9 Science Chapter 5 Case Based Questions - The Fundamental Unit of Life
(I) Read the given passage and answer the questions based on the passage and related studied concepts. Although the cell is the basic structural and functional unit of all organisms, cells differ enormously in size, shape, and function. Some are free living, independent organisms, while others are immovable fixed as part of tissues of multicellular organisms. All cells exchange materials with their immediate environment and therefore, have a plasma membrane that controls which substances are exchanged by allowing some materials to pass through it while slowing or stopping others. The cytoplasm is protected from the environment, yet still can exchange materials with it. Within the cytoplasm, cells differ in the type and number of organelles. Prokaryotic cells have the simplest structure with each independent cell lacking any internal membrane organelles, including the lack of a nuclear membrane to separate the genetic chromosome material from the rest of the cytoplasm. More typical and more specialized are the eukaryotic cells, with a double nuclear membrane and membrane organelles specialised to fit their function. Since no one cell would have all organelles possible, observing a variety of animal cells will give you an idea of the similarities and differences among cells.
Q2: Name a cell organelle found only in plant cell and name its type. Ans: Plastids are a type of cell organelle found only in plant cells. They are of two types- chromoplasts and leucoplasts.
Q3: What is the function of Golgi body? Ans: Golgi body is the secretory organelle of the cell. It is involved in the formation of lysosomes and peroxisomes.
Q4: What is the function of Endoplasmic Reticulum(ER)? Ans: It helps in lipid and protein synthesis.
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