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Cells

Biology

COMPARISON BETWEEN ANIMAL CELL AND PLANT CELL

COMPARISON BETWEEN ANIMAL CELL AND PLANT CELL Plant Cell & Animal Cell Cell Specialisation Cells are specialised to perform different functions in both plants and animals Example; Palisade cells have many chloroplasts for photosynthesis Root hair cells are long and thin to absorb water from the soil Red blood cells have hemoglobin which transports oxygen Sperm cells have a tail to swim to the egg Multicellular organisms cells that perform the same function are grouped together to form a tissue Each tissue is therefore made up of cells that are specialised to carry out a particular function.   Organs An organ is made up of different tissues e.g. the heart, lungs, kidneys and the brain in animals and roots, stems and leaves in plants Organ systems Organs which work together form an organ system Digestive, excretory, nervous and circulatory in animals and transport and support system in plants organism. Different… Read More »COMPARISON BETWEEN ANIMAL CELL AND PLANT CELL

Biology

WATER RELATIONS IN PLANT AND ANIMAL CELLS

WATER RELATIONS IN PLANT AND ANIMAL CELLS The medium (solution) surrounding cells or organisms is described by the terms hypotonic, hypertonic and isotonic. A solution whose solute concentration is more than that of the cell sap is said to be hypertonic A cell placed in such a solution loses water to the surroundings by osmosis A solution whose solute concentration is less than that of the cell sap is said to be hypotonic A cell placed in such solution gains water from the surroundings by osmosis A solution which has the same solute concentration as the cell sap is said to be isotonic When a cell is placed in such a solution there will be no net movement of water either into or out of the cell   Osmotic Pressure               The term osmotic pressure describes the tendency of the solution with a high solute concentration to draw water into itself… Read More »WATER RELATIONS IN PLANT AND ANIMAL CELLS

Biology

THE CELL – Cell membrane, Cell wall, Plasma Membrane, Endoplasmic Reticulum,

THE CELL – Cell membrane, Cell wall, Plasma Membrane, Endoplasmic Reticulum & Ribosomes, Goigi Bodies, Mitochondria Introduction What is a cell? The cell is the basic unit of an organism. All living organisms are made up of cells. Some organisms are made up of one cell and others are said to be multicellular. Other organisms are made of many cells and are said to be multicellular. Cells are too little to see with the naked eye. They can only be seen with the aid of a microscope   The microscope The microscope is used to magnify objects Magnification The magnifying power is usually inscribed on the lens To find out how many times a specimen is magnified, the magnifying power of the objective lens is multiplied by that of the eye piece lens If the eye piece magnification lens is x10 and the objective lens is x4, the total magnification… Read More »THE CELL – Cell membrane, Cell wall, Plasma Membrane, Endoplasmic Reticulum,

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