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Under which wavelength of light in the visible spectrum will the rate of photosynthesis in plants be the greatest and how will the growth of plants be affected?

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Extended Essay Research Question- Under which wavelength of light in the visible spectrum will the rate of photosynthesis in plants be the greatest and how will the growth of plants be affected? Introduction- This essay is based on the investigation of the effect of different wavelengths of light on the growth of plants. The aim of this experiment is to find out which wavelength of light will influence the growth of a plant the most. Background Information- Photosynthesis is an essential process for the survival of all life on earth. This process has two major implications; it is the means, by which the sun's energy is captured by plants for use by all organisms, it is also the process that releases oxygen into the atmosphere for use by all aerobic organisms. ...read more.


groups of hundreds of molecules of chlorophyll to a special chlorophyll molecule at the center of the photosystem. There are two kinds of photosystems, photosystem I (PS I) and photosystem II (PS II). This molecule is responsible for passing these 'excited' electrons to a chain of electron carriers. The process that follows this is the production of ATP. 'Excited' electrons are passed through a series of electron carriers; these electrons lose some energy every time they pass from one carrier to the next. Eventually, enough energy is released to produce one molecule of ATP. After releasing the energy required to make one ATP molecule, the electrons are accepted by PS I. At this stage PS I also absorbs light and the electrons are once again elevated to the 'excited' state. ...read more.


The linking together of two Triose phosphate molecules produces glucose phosphate. The condensation of many molecules of glucose phosphate forms starch, the main end product of photosynthesis. It is the production of starch within the chloroplasts of the plant that facilitates the growth and development of plants. Hence a relation can be drawn between the growth of plants and the nature of the light to which the plant is exposed. A schematic diagram showing the different processes involved in photosynthesis. Hypothesis- The rate of photosynthesis will be greater if a plant is exposed to violet light (400-450 nm) or red light (630-700nm) as compared to green light (510-550nm). This is so because the Light Spectrum1 Apparatus List- 1. X Plant 2.7 Water Troughs 3.pH meter 4.Digital Balance 5.Thermometer 6.100 cm3 measuring cylinder 7. 6 large boxes 8.60 W colored bulbs (Violet, Blue, Green, Yellow, Orange and Red) 9. 6 Lamps 10.Measuring Cylinder 11.Lap Pro 12.Scissors 13.Water 1 www.gamonline.com/catalog/ colortheory/visible.php, 05/12/2004 ...read more.

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