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Plant mineral defficiency
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DescriptionExperiment about plant mineral defficiency
A Report on the Effect of Caffeine on Heart Rate
Prepared for Biology Practical 1.1
The strength of plant fibres.
To investigate the strength of plant fibre as compared to concrete strength.
What is the difference in strength of plant fibres and concrete?
Concrete has the greatest strength followed by plant fibres and hair.
Diagram 1: Lemna Plants
Plant fibres are long, stretched, thick and lignified cell walled tubes. One component of the plant fibre is its cell wall made of cellulose microfribils in a net-like arrangement which gives strength to the plant fibres. Slerenchyma fibres are also present in plant fibres. They form secondary cell wall which are dead cell with lignin which provides even more strength to plant fibres. The xylem and phloem are also responsible for plant fibres’ thick cell wall and hardness. This is because the lignin on the outer part of their vessels.
Retting is a stage in the manufacturing of vegetable fibres, especially the bast fibres. It is a process that employs water and microbial action to separate the bast fibres from the woody core (the xylem), and sometimes from the epidermis as well. Retting can be done by letting the cut crop stand in the fields in the wet Fall, called "dew retting". Bacterial action attacks pectin and lignin, freeing the cellulose fibres. The stems are monitored during retting to avoid excessive degradation of the fibres, making it a very labour-intensive process. The stems can now be removed and processed mechanically to produce fibres. These fibres can be tested to measure the amount of tensile stress it can cope before it breaks. This is known as tension strength. Knowing the tensile strength of a fibre can make it suitable for different uses. E.g.ropes for climbing have to have a certain amount of stress tolerant for it to be suitable to carry a person.
All plants require certain mineral elements to develop and mature in a healthy state. Macronutrients such as nitrogen, potassium, phosphorus, sulfur, calcium, and magnesium are required in substantial quantities, while micronutrients or trace elements such as boron, iron, manganese, copper, zinc, and molybdenum are needed in much smaller quantities.
Table 1: Relative amounts of mineral elements compared to nitrogen in dry shoot tissue. May vary depending on plant species.
Nitrogen is about 1/3 as abundant as carbon. It occurs principally as diatomic N2 in the atmosphere. It is the lightest element with 5 e- in outer orbital shell, 3 valence electrons and one unshared pair. It makes + charged groups possible.
In resonating rings, it acts as the focal point for ...
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