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Monday, 19 January 2015

Photosynthesis

Photosynthesis

Characterizes the plants is the ability to manufacture the food itself, with a process called photosynthesis. This process takes place in all green parts of a plant, especially in leaves, thanks to the presence of chlorophyll in the chloroplasts of plant cells.

Chlorophyll is a green substance capable of absorbing the light of the sun and of containing the energy. By means of this energy, a chemical reaction occurs in the chloroplast between the water absorbed by the roots in the soil, and the carbon dioxide present in the air.

First, the water is decomposed into its two components, hydrogen and oxygen, then the hydrogen combines with the carbon dioxide forming a particular sugar: glucose. This sugar is the food that will feed the plant, while the oxygen will be emitted into the air.

Photosynthesis takes place when the crude sap (water and minerals) rises through the lymph channels up to the leaves, real laboratories of the plant, where under the action of chlorophyll (particular substance that gives plants the green color) and with the energy of sunlight, carbon dioxide and minerals are transformed into elaborated sap (sugars and oxygen).

The oxygen through the stomata is released into the environment, while the sugars are retained by the plant which uses them to live, to grow, build leaves, flowers, fruits and seeds.

Photosynthesis occurs in day in the presence of sunlight, while at night the oxygen and sugars are retained by the plant and the carbon dioxide is emitted into the environment.