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Note on Plant Nutrition and Transport

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Introduction

´╗┐Plant Nutrition and Transport Photosynthesis Photosynthesis is the process that produces food in plants, it produces glucose. Photosynthesis happens in the chloroplasts, which are found in leaf cells and in other green parts of a plant. Chloroplast contains a pigment called chlorophyll which absorbs sunlight and uses its energy to convert carbon dioxide and water to glucose. Oxygen is produced. Carbon dioxide + water ? (sunlight) glucose and oxygen 6CO2+6H2O ? C6H12O6 + 6O2 Fine scale diagram of leaf structure Leaves are designed for photosynthesis as seen by the structure: * Leaves are broad so there is a large surface area exposed to light. * Most of the chloroplasts are found in the palisade layer. That is so they?re near the top of the leaf where there is a lot of light. * The palisade is very tightly packed so no light is lost. * The upper epidermis is transparent so light can pass through. * Leaves have a network of vascular bundles ? they are transport vessels xylem and phloem. ...read more.

Middle

by covering so it has no light or putting in a vacuum with soda lime so there is no CO2. Image:Photosynthesis-oxygen-evolved.jpeg We can also see the photosynthesis through the rate of oxygen production by the plant and we can measure that by this set up. Minerals for Healthy growth Plants need 4 minerals which are: Phosphates: they contain phosphorus which is needed for respiration and growth and dna. Without it the plant as poor roots and purple leaves. Potassium: it helps the enzymes that deal with photosynthesis and respiration, if there is a lack then there is poor fruit and flower growth as well as discoloured leaves. Magnesium: it is needed for the making of chlorophyll which is used in photosynthesis, if there is none the leaves are yellow. Transport in Plants Multicellular organisms needed transportation systems in them as they can?t absorb everything through diffusion, also it would be too slow due to surface area to volume ratio. ...read more.

Conclusion

open wider to allow more carbon dioxide into the leaf for photosynthesis Temperature Transpiration is faster in higher temperatures Evaporation and diffusion are faster at higher temperatures Wind Transpiration is faster in windy conditions Water vapour is removed quickly by air movement, speeding up diffusion of more water vapour out of the leaf Humidity Transpiration is slower in humid conditions Diffusion of water vapour out of the leaf slows down if the leaf is already surrounded by moist air Measuring Transpiration A photometer can be used to measure the transpiration rate. potometer 1. Cut the shoot slanted so there is maximum surface area 2. Assemble the photometer in water and insert underwater so no water can enter 3. Check if apparatus is air tight 4. Dry the leaves and allow time for accilamtise and then shut the tap. Remove the end of the capillary rube, until one bubble is formed 5. Record the starting position of the bubble 6. Start the stop watch and record the distance moved by the bubble per time unit 7. Keep the conditions constant throughout the experiment e.g. temperature and air humidity. ...read more.

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