26) The spherical, sac-like lysosomes contain powerful digestive enzymes and form the waste disposal system of the cell. They are also known as 'suicide bags'. 27) Mitochondria and plastids are each covered by 2 membranes and possess own DNA and ribosomes. 28) Mitochondria are the 'powerhouses of the cell', providing energy for various metabolic activities. 29) Chromoplasts and leucoplasts are the 2 of plastids present in plant cells. 30) Chloroplasts are chromoplasts containing chlorophyll and carry out photosynthesis in plants. 31) Leucoplasts store starch, oil and protein granules. 32) The large central vacuole of mature plant cells provides turgidity to the cell and also stores important substances. 33) In unicellular organisms, vacuoles play important in nutrition and osmoregulation. 34) Ribososmes are sites of protein synthesis. 35) Centrosome is found only in animal cells and consists of 2 centrioles. Centrosome helps in cell division. 37) The membrane-bound cell organelles are absent in prokaryotic cells. 38) Differences between plant cell and animal cell. Plant cell Animal cell 1 Plant cells are generally large in Animal cells are smaller than plant size. 2 Plant cells possess plastids. Animal cells lack plastids. 3 Cell wall is present Cell wall is absent. 4 Mature plant cells possess a large, Animal cells possess many small central and permanent vacuole. and temporary vacuoles. 5 Centrosome and centrioles are Centrosome and centrioles are absent in plant cells. present in animal cells. 39) The basic structural organization of the cell helps it to perform important functions like respiration, nutrition, excretion and protein synthesis.
26) The spherical, sac-like lysosomes contain powerful digestive enzymes and form the waste disposal system of the cell. They are also known as 'suicide bags'. 27) Mitochondria and plastids are each covered by 2 membranes and possess own DNA and ribosomes. 28) Mitochondria are the 'powerhouses of the cell', providing energy for various metabolic activities. 29) Chromoplasts and leucoplasts are the 2 of plastids present in plant cells. 30) Chloroplasts are chromoplasts containing chlorophyll and carry out photosynthesis in plants. 31) Leucoplasts store starch, oil and protein granules. 32) The large central vacuole of mature plant cells provides turgidity to the cell and also stores important substances. 33) In unicellular organisms, vacuoles play important in nutrition and osmoregulation. 34) Ribososmes are sites of protein synthesis. 35) Centrosome is found only in animal cells and consists of 2 centrioles. Centrosome helps in cell division. 37) The membrane-bound cell organelles are absent in prokaryotic cells. 38) Differences between plant cell and animal cell. Plant cell Animal cell 1 Plant cells are generally large in Animal cells are smaller than plant size. 2 Plant cells possess plastids. Animal cells lack plastids. 3 Cell wall is present Cell wall is absent. 4 Mature plant cells possess a large, Animal cells possess many small central and permanent vacuole. and temporary vacuoles. 5 Centrosome and centrioles are Centrosome and centrioles are absent in plant cells. present in animal cells. 39) The basic structural organization of the cell helps it to perform important functions like respiration, nutrition, excretion and protein synthesis.
CBSE%20Class%209%20Biology%20Fundamental%20Unit%20Of%20Life%20Notes.docx