Investigate the Effect of Moisture Content on Wheat Grain Seeds Respiration Rate :: GCSE Biology A2 A-Level Coursework

Investigate the Effect of wet Content on Wheat Grain Seeds Respiration Ratetheory There ordain be a positive correlation among wet cloy of drinking straw grains and their respiration rate. Therefore as themoisture content (independent changeable) increases so will therespiration rate (dependent variable star).The rationale roll in the hay the hypothesis came from studying photosynthesisin plants. During the light-dependent reactions of photosynthesis, thephotolysis of water (H2O) occurs inside photosystem II. The productsof photolysis combine with nicotinamide adenine dinucleotide orthophosphate from photosystem I, to form reducedNADP. This reduced NADP passes to the light-independent reactions ofphotosynthesis, where it is utilised to make triose phosphate fromglycerate 3 phosphate. With discover water, photolysis would not occur andtherefore the light-dependent and light-independent reactions wouldnot take range at all. Therefore I would predict that the highermoisture conte nt of straw grain seeds the higher the respiration ratewill be, this is because the seeds will be able to utilise more waterthan a wheat grain seed with low moisture content.VARIABLES The independent variable utilise in this experiment is goingto be moisture content, and the dependent variable will be therespiration rate. The other variables temperature, circulate pressure andair will be kept at fairly eonian levels. Carrying discover theexperiment inside a fume cupboard will uphold achieve in keeping thesevariables to remain constant. However another variable sunlight cannotbe controlled during this experiment, and will obviously vary duringthe experiment. The possibility of use a standard light bulb to keeplight levels constant was considered, but was rejected due to safetyfears e.g. overheating when the experiment was not being monitoredduring the time between readings.BACKGROUNG KNOWLEDGE Deterioration of stored grain seeds is an classical economic problem in agriculture, therefore it is importantto find out the most suitable conditions for stored grain seeds to bemaintained in. For this experiment wheat grain has been chosen, thisis because it is widely cultivated around the world e.g. theMediterranean and westerly Asia, and is used to make flour and pasta. Thismeans wheat is a staple fibre crop throughout the world, and its storage isessential.To store grain effectively it is important to stop germination fromoccurring at all. Germination is the onset of growth of the embryo ina seed, this usually happens after a period of dormancy. dormancy isthe state where germination will not occur, even if environmentalconditions are favourable. This is often an advantage for seeds, as itallows germination to occur in a more favourable season. In the caseof wheat seeds they need some(prenominal) weeks or months of prechilling beforethe will actually germinate.