Plant cell structure (AS level)

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Plant cell structure
A plant cell is a type of eukaryotic cell. It is found in plant leaves and steams. It has
some important characteristics which are not found in other eukaryotic cells. It has three
main components which are not found in animal eukaryotic cells. These are large
permanent vacuoles, chloroplasts and cellulose cell walls.
Moreover, a plant is well adapted for carrying out photosynthesis. This is the process
by which plants make food. Plant cells are long and thin, and they form a continuous layer.
This continuous layer will catch as much light as possible, which will provide energy for the
process. Each cell also contains a great deal of chloroplasts, which are the main
organelle for photosynthesis. They trap sunlight and also carry out photosynthesis. They
are positioned within the cell so that they catch as much light as possible. They also give
plants their green pigment, since they contain chlorophyll. Plants also contain a large
vacuole which pushes the cytoplasm to the edge of the cell. This keeps the cells turgid,
so that the plant leaves are stiff (semi-rigid) and this stops the leaves from drooping.
Chloroplasts, as I have just said, are the organelle which carried out photosynthesis.
They contain
chlorophyll, which is a green pigment. This traps
light which provides the energy for the endothermic reaction. There are many different
parts in a chloroplast, which helps it to carry out it's function. There is the chloroplast
envelope, which is a double membrane. This surrounds the organelle and allows
substances to enter and leave the cell. There is also grana which are collections of
thylakoids. Thylakoids are disc like structures and they are the part of the chloroplast

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Grana are made up of about 100 thylakoids, and it is here
that the first stage of photosynthesis takes place. The granal membrane gives a larger
surface area over which the chlorophyll can attach. The first stage of photosynthesis is
very specific, and the electrons carriers and enzymes help to carry out this stage. The
chemicals are attached to the granal membrane in a specific order, so that this stage can
be carried out efficiently.…read more


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