NCERT Solutions for Class 9 Science Chapter 5
The Fundamental Unit of Life
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-66
Questions No- 1
Make a comparison and write down ways in which plant cells are different from animal cells.
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Differences Between Plant Cells and Animal Cells:
1. Cell Wall:
– Plant Cells: Have a rigid cell wall made of cellulose, providing structure and support.
– Animal Cells: Lack a cell wall; their shape is maintained by a flexible cell membrane.
2. Chloroplasts:
– Plant Cells: Contain chloroplasts, allowing them to perform photosynthesis and produce their own food.
– Animal Cells: Do not have chloroplasts; they cannot produce food through photosynthesis.
3. Vacuoles:
– Plant Cells: Have a large central vacuole for storage, maintaining turgor pressure and storing nutrients.
– Animal Cells: Contain smaller or multiple vacuoles primarily for storage purposes.
4. Shape:
– Plant Cells: Usually have a fixed rectangular or square shape due to the cell wall.
– Animal Cells: Display various shapes, often round or irregular.
5. Lysosomes:
– Plant Cells: Fewer or absent lysosomes.
– Animal Cells: Contain numerous lysosomes for waste breakdown and recycling.
6. Mitochondria:
– Plant Cells: Contain mitochondria for energy production.
– Animal Cells: Also have mitochondria for energy generation.
7. Centrioles:
– Plant Cells: Typically lack centrioles except in lower plant forms during cell division.
– Animal Cells: Have centrioles aiding in cell division by forming spindle fibers.
8. Lipid Droplets:
– Plant Cells: Fewer lipid droplets.
– Animal Cells: May have more lipid droplets for energy storage.
9. Flagella and Cilia:
– Plant Cells: Usually lack flagella or cilia.
– Animal Cells: Some have flagella (e.g., sperm cells) or cilia (e.g., in the respiratory tract) for movement or sensory functions.
The cells of animals and plants have the following differences:
Animal Cell:
1. Animal cells are generally small in size.
2. Cell wall is absent.
3. Except the protozoan Euglena, no animal cell possesses plastids.
4. Vacuoles in animal cells are many, small and temporary.
5. Animal cells have a single highly complex and prominent Golgi apparatus.
6. Animal cells have centrosome and centrioles.
Plant Cell:
1. Plant cells are larger than animal cells.
2. The plasma membrane of plant cells is surrounded by a rigid cell wall of cellulose.
3. Plastids are present.
4. Most mature plant cells have a permanent and large central sap vacuole.
5. Plant cells have many simpler units of Golgi apparatus, called dictyosomes.
6. Plant cells lack centrosome and centrioles.
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