All green plants make their own food by the process of photosynthesis;
• using atmospheric carbon dioxide and soil water as raw material, and
• sunlight [trapped by chlorophyll] as the source of energy.
In definition photosynthesis is the process of plants to manufacture their food using carbon<iv>oxide in the presence of sunlight and chlorophyll.
The main features of photosynthesis are as follows;
• Photosynthesis takes place in the chloroplasts of plant cells, in the presence of sunlight.
•The raw material of the process are the low energy containing in organic compounds, e.g. carbon dioxide and water,
• The final product of the process are high energy containing sugars (organic compounds). Oxygen is given off as a waste product.
• The energy needed to drive this anabolic process comes from the sunlight absorbed by the chlorophyll, the green pigment found in chloroplasts.
The gases, carbon dioxide and oxygen, move in and out between the surrounding air and the leaves through stomatal openings on the leaf surfaces. Water from the soil enters the root hair by osmosis. From the root hairs it is conducted upwards through the stem to the leaves.
Most of the sugars produced are changed into starch in the leaf cells. They are stored in this insoluble form untill night-time. Then, the starch is converted back into sugars (soluble form) to be transported to other parts of the plant where they are needed. This movement of sugar is know as translocation.
In the cells, the sugar are used as a source of energy. Some plants have special storage organs where the sugar is converted back to starch to be stored for long period of time. The storage organ may be roots, stems, fruits or seed.
Note: Factors responsible for photosynthesis are as follows;
• Sunlight.
• Carbon dioxide.
• Chlorophyll .
• Water.
PICTORIAL ILLUSTRATIONS:
• using atmospheric carbon dioxide and soil water as raw material, and
• sunlight [trapped by chlorophyll] as the source of energy.
In definition photosynthesis is the process of plants to manufacture their food using carbon<iv>oxide in the presence of sunlight and chlorophyll.
The main features of photosynthesis are as follows;
• Photosynthesis takes place in the chloroplasts of plant cells, in the presence of sunlight.
•The raw material of the process are the low energy containing in organic compounds, e.g. carbon dioxide and water,
• The final product of the process are high energy containing sugars (organic compounds). Oxygen is given off as a waste product.
• The energy needed to drive this anabolic process comes from the sunlight absorbed by the chlorophyll, the green pigment found in chloroplasts.
The gases, carbon dioxide and oxygen, move in and out between the surrounding air and the leaves through stomatal openings on the leaf surfaces. Water from the soil enters the root hair by osmosis. From the root hairs it is conducted upwards through the stem to the leaves.
Most of the sugars produced are changed into starch in the leaf cells. They are stored in this insoluble form untill night-time. Then, the starch is converted back into sugars (soluble form) to be transported to other parts of the plant where they are needed. This movement of sugar is know as translocation.
In the cells, the sugar are used as a source of energy. Some plants have special storage organs where the sugar is converted back to starch to be stored for long period of time. The storage organ may be roots, stems, fruits or seed.
Note: Factors responsible for photosynthesis are as follows;
• Sunlight.
• Carbon dioxide.
• Chlorophyll .
• Water.
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That was quite educating.
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