2.3.3 Effects of heavy metals on plants Plants are sensitive for both‚ deficient and excess availability of some of the heavy metal ions. In which some of them at low concentration are compulsory micronutrients‚ while the same at higher concentrations such as Cd‚ Hg‚ As are intensely toxic to the metabolic activities of the plants (Reeves and Baker‚ 2000; Fernandes and Henriques‚ 1991). Agricultural soil is contaminated by heavy metals‚ has become a critical environmental concern due to their potential
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covers assessment criteria 5 and 6 The Photoelectric effect‚ and the Production of Light In 1887 Hertz discovered the photoelectric effect‚ where electrons were emitted from a zinc surface when illuminated with ultra-violet light. These electrons (called ‘photoelectrons’) were only emitted when the frequency of the ultra-violet light was above a certain value (called the ‘threshold frequency’). Criteria 5c Assume that ultra-violet light is falling onto a piece of zinc‚ and photoelectrons are
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IRP 3: Germination Introduction: Germination is the process of which a plant of fungus emerges from its seed or spore. Germination involves activating the seed’s metabolism‚ which is done through numerous stages. The fist stage involves the rehydrating the cell by absorbing water. This allows the cell to become metabolically active. After water absorption‚ gibberellin is produced in the cotyledon of the seed. The enzyme gibberellin stimulates the production of amylase‚ which catalyzes the
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The Effect of Light Intensity The effect of different light wavelengths was tested in the following experiment. The rate of photosynthesis can be affected depending on the light treatment it receives. With the aid of DPIP acting as NADPH in photosynthesis‚ it was possible to observe the reaction as it took place. Samples were created with dark‚ 24 cm‚ 30 cm‚ and 49 cm light treatments. The absorbance was measured in five-minute intervals for each sample and recorded in an appropriate table
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Investigation of the effect of light intensity Equipment: * Data loga * Light sensor * Bulb * Metre ruler X3 Variables: Independent variable – distance of the light sensor from the light source (m) Dependant variable – intensity of light (lux) Control | Why it needs to be controlled? | How will you control it? | Bulb | There are different watts in different bulbs | Use the same bulb‚ but if your one does break half way through the experiment you can use another bulb with the
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Do Unto Others In the book Ella Minnow Pea‚ the linguistic world around them is eroding as the roots of their native language is slowly decaying as the days go by. During this time of confusion‚ hate‚ and misunderstanding the villagers must unite‚ for if they do not‚ the loved ones around them will start to fade away as well. The struggles they face between friends‚ family‚ and neighbors will challenge the close knit relationships they’ve spent a lifetime building in their small island community
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EFFECTS OF WATER SOLUTIONS IN PLANT GROWTH CHAPTER I Introduction Plants are affected by different substances that come into contact with them. These effects may be good or bad. There are certain substances such as fertilizers‚ which have a positive effect on the growth of certain plants‚ more specifically pechay (Brassica rapa variety chinensis). Pechay is commonly used in cooking in Filipino households. It requires little attention as it is a very hardy plant. It is rich in vitamins A‚
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PLANT BIOLOGY WITH RESPECT TO ABIOTIC STRESSES TO ENVIRONMENT [pic] Plant biology with respect to Abiotic stresses to environment Biology assignment:- Given by MAM MARYIM To Group # 4 Group members:- UMMA-E-FARWA (34) ADEEB DANISH (20) MUHAMAD SHEHZAD (33) Content • Abiotic stress • Abiotic stress conditions • Drought • Salinity • High temperature • Chilling • Flooding • Troposphere ozone • Oxidative damage • Defense mechanism
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The effect of nutrient deficiency and toxicity in plants Nutrient Micronutrient Nitrogen (N) Deficiency effect Toxicity effect Leaves become dark green and susceptible to drought‚ pests and diseases as well as failed yield for fruits and seed crops. Limit the uptake of other nutrient‚ which is magnesium or potassium. Older leaves at the bottom of plant will start to become yellowish (chlorosis) while the rest of the plant’s leaves will be light green. Calcium (Ca) Newer leaves at the top of the
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WEAKNESSES OF INVESTIGATION 23 IMPROVEMENTS OR FUTURE INVESTIGATIONS 23 CONCLUSION 25 INTRODUCTION Hydroponics is a technique of growing plants without basing them in soil. Hydroponic systems have been used since ancient times; it is believed that the legendary Hanging Gardens of Babylon employed a technique of ‘flowing water’ to keep plants alive. Chinese and South American cultures appear to have used hydroponics in cultivating crops since around 1300AD (Turner. B. n.d.). There
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