New English School Chitali Smt Kedar S N
- Slides: 10
New English School Chitali Smt. Kedar S. N.
RAYAT SHIKSHAN SANSTHA, SATARA NEW ENGLISH SCHOOL CHITALI RAHATA Powerpoint Presentation 9 TH STD. -SCIENCE & TECHNOLOGY
Unit : 5 CELL: The Unit Of Life SUB - UNIT Cell Organelles
Cell Organelles 1. 2. 3. 4. 5. 6. Nucleus Endoplasmic Reticulum Golgi Complex Lysosome Mitochondria Vacuoles
1. NUCLEUS Chromatin fibres are thin thread like structure Composed of DNA and proteins. DNA molecules transfer the hereditary information from one Generation to the next. is called DNA. Functions: 1. 2. 3. In controls all metabolic activities of the cell. Nucleus controls cell division. It is involved in transmission of hereditary characters from parents to off springs.
2. Golgi complex was first described by a German scientist “ Camillo Golgi ”. It Comprises of five to eight sacs which resemble deflated balloons placed approximately parallel to each other.
3. Endoplasmic Reticulum 1. Along with intracellular transport it also acts. as a supportive framework for a cell. 2. It synthesizes proteins and lipids and transports them. Some lipids synthesized by it are used in building plasma membrane while some other lipids and proteins are used as hormones and enzymes. 3. It transports proteins synthesized by ribosomes. 4. SER of certain cells of liver play a crucial role in detoxifying many proteins and drugs which enter our body through food, air or water. It makes the toxins water soluble so that they may be exerted through urine.
4. Lysosome Due to various metabolic activities going On in the cell, organic waste is gene rated. Lysosomes digest the waste. Lysosomes are Simple one membrane bound sacs, filled with digestive enzymes. These powerful enzymes are made by RER and are capable of digesting and Breaking down all organic matter. It is the cell’s Waste disposal system. Lysosomes are absent in Plant cells.
5. Mitochondria Ø Ø Mitochondria produce the energy rich compound ATP which is the energy currency of the cell. The body uses the energy stored in ATP to synthesize chemical compounds and to do mechanical work.
6. Vacuoles: q Vacuoles help to maintain osmotic pressure of the cell. q q q They stored metabolic byproducts and end products. They stored waste products and food in animal cell. In plant cells, vacuoles are full of cell sap and provide turgidity and rigidity to them.
