Light and Photosynthesis

Introduction In my project, plants test that light is really necessary for photosynthesis. It will be interesting to see how light affects plant photosynthetic rates and if they do not get the light needed to produce starch. The plant I chose was geranium of a dicotyledonous plant in a hot and dry area of ​​South Africa. To observe whether target light affects photosynthetic rate of plants.

For example, light intensity affects photosynthesis speed. Without light there is no photosynthesis. As the light intensity increases, the speed of photosynthesis increases as long as other factors are available. As interest rates rise, eventually there will be another factor shortage. The figure below shows the effect of low carbon dioxide concentration. After all, it is insufficient to support a higher photosynthetic speed, and raising the light intensity has no effect, so the speed is smooth.

To understand the importance of photosynthesis, studies have been undertaken to help determine which wavelength light and light intensity of chloroplasts produces the fastest rate of photosynthetic reactions for photosynthesis. In plants, photosynthesis occurs in chloroplasts. Chloroplasts absorb light energy into chemical energy such as ATP and NADPH. Photosynthesis is the process of converting carbon dioxide into organic compounds (such as monosaccharides) using energy from sunlight (Smith, A. L). The chemical reaction formula of photosynthesis is as follows. 6 CO 2 + 6 H 2 O + light energy → C 6 H 1206 +6 02

The synthesis of organic compounds from carbon dioxide and water (including oxygen) using light energy absorbed by chlorophyll is called photosynthesis. Alternatively, light energy is captured by photosynthesis, and then energy is converted into chemical energy. That is the need for organisms to survive. Plants are autotrophs that extract energy from sunlight and are called photosynthesis because they collect organic molecules from inorganic sources. In Greek word "light" means the meaning of light and "synthesis"

Two stages of photosynthesis: Photosynthesis is done in two stages: light dependence reaction and Calvin cycle (light non-dependent reaction). Light-dependent reactions occurring in thylakoid membranes generate light ATP and NADPH using light energy. The carban cycle occurring in the matrix prepares GA 3 P from carbon dioxide utilizing energy from these compounds. The process of converting light energy into chemical energy occurs in a multiprotein complex called the photochemical system. The thylakoid membrane is embedded with two kinds of optics, photochemical system II (PSII) and photochemical system I (PSI). Each lighting system plays an important role in getting energy from sunlight by excited electrons. These excited electrons are transported through "energy carrier" molecules that promote the reaction independently of light.