EXPERIMENTAL: AN INVESTIGATION INTO SOME OF THE VARIABLES INVOLVED IN 
THE GERMINATION OF SEEDS
Introduction The development, dispersal, and germination of seeds represents part of the complex structures and mechanisms by which flowering plants ensure successful reproduction; this is important, because the only purpose of these living organisms is to ensure that some or all of their genes are passed onto future generations. Furthermore, as producers, flowering plants provide - via photosynthesis - the chemical energy required by consumers and decomposers: Light / Chlorophylls / Enzymes 6CO2(g) + 6H2O(l) 覧覧覧覧覧覧覧覧覧覧覧 C6H12O6(aq) + 6O2(g) +DE
Seeds vary enormously in size and internal structure. Nevertheless, the structure of a typical seed is as follows: an embryo, consisting of a young shoot (the plumule), a young root (the radicle), and one or more seed leaves (the cotyledons), surrounded by a seed coat (the testa).
Careful experiments have established that, for successful germination, seeds have three requirements: water (to allow diffusion); dioxygen (to ensure that enough energy, in the form of ATP, is released via aerobic respiration); and a suitable temperature (to promote enzyme activity). Enzymes C6H12O6(aq) + 6O2(g) 覧覧覧覧覧覧覧覧覧覧 6CO2(g) + 6H2O(l) -DE
However, the effects of other independent variables on either the rate or success of seed germination remain to be established; a detailed knowledge of these variables is necessary in view of increasing levels of pollution.
In this investigation, you are required to examine at least four 
variables involved in the germination of seeds; at least two of these 
must be quantitative, and at least one must be qualitative.
Notes
1.  Apart from your notes and standard textbooks, sources of scientific
knowledge include encyclopaedias in libraries, on CD-ROMs, and on the 
Web; it is good practice to include a bibliography in your write-up.
2. You are provided with several varieties of seeds [including cabbage (Brassica oleracea), cress (Lepidum spp.), lettuce (Latuca spp.), mung beans (Phaseolus aureus), mustard (Brassica nigra), rape (Brassica rapa), pea (Pisum savitum), and sunflower (Helianthus annus)], plant growth regulators, enzymes, aqueous solutions of salts and acids (each with an initial concentration of 0.20 mol dm-ウ), growth substrates, and light sources. In addition, you will need to use - within reason - suitable apparatus.
3. The proposed plans of your investigation should be presented in detail; these plans may be modified as the investigation proceeds.
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