Gymnosperm

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    Gymnosperms Research Paper

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    II. Nature is not a Museum The gymnosperms are often called ‘Living Fossils’, or are dismissed as being primitive. Gymnosperms are indeed ancient: originating in the carboniferous period (Bowe, Coat, & dePamphilis, 2000). They can be divided into four monophyletic groups: ginkophytes, gnetophytes, cycads, and the largest of the four (with more than 600 extant species), conifers. Conifers account for the greatest diversity amongst the gymnosperms. This diversity might pale in comparison to that of the angiosperms, but a group can have biological importance without being speciose. From an ecological point of view, gymnosperm success is in fact comparable to angiosperms, as gymnosperms are thriving in important niches across latitudes. This is…

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    Slow Seedling Hypothesis

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    the best competitors, and angiosperms have certainly been described as having an extra edge. As discussed in the introduction, the fossil record shows that gymnosperms were quickly displaced by angiosperms upon their arrival. Yet despite the number of hypotheses (table 1) put forward to explain this shift in vegetation, gymnosperms’ competitors have not yet been discovered. Among the numerous hypotheses, three are discussed in depth here (summarised in fig. 1). The first two hypotheses are…

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    Plant Growth Lab

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    Plant Growth Lab The world is full of variety of species that help make the Earth a unique place to live in. Many of the species that live on Earth are plants. Plants can be Bryophytes or Tracheophytes. Bryophytes are non vascular and lack roots, stems and leaves. Tracheophytes can be spore producing or seed producing. Seed producing Tracheophytes can be Gymnosperms or Angiosperms. Gymnosperms have seeds that are enclosed in a cone and would include Pines and Coniferous trees. Angiosperms…

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    Eukaria Biology

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    Gymnosperms are the naked bearing seeds (e.g conifers, cyadas etc.) that thrived as the climate dried, differentiating them from bryophytes and non-vascular seedless plants. In the late Mesozoic era, around 140 million years ago, angiosperms began to replace gymnosperms in certain ecosystems. Angiosperms are seeds of flowering and fruit-bearing plants and have a intricate life cycle. Within the diploid megasporangium of each ovule the diploid megasporocyte will meiotically divide into four…

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    revealed the random movement to be a general property of matter in the state, and the phenomenon has long been know as Brownian motion in his honor” (Britannica 2). Scientists extensively misunderstood Brown’s discovery of the Brownian motion. Scientists had asserted that Brown did not have the correct microscope needed to prove such a theory. “It has become plain that many workers have discussed the problem without consulting Brown’s original words on the subject, and it is abundantly clear…

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    found in most island ecosystems where there is a strong wind direction. Hawaii is a great example. The islands of Waikiki and Diamond Head receive only about 13 inches of rain a year nearly a desert! Boreal Forest The boreal forest is found in a nearly continuous abundance across North America and Eurasia. The boreal forest corresponds with regions such as the subarctic and cold continental climate. There are long, severe winters with temperatures as low as freezing and very short summers. (50…

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    effects of having various amounts of vegetation grow caused the decrease of carbon dioxide levels. Also the predatory species Amphibians were growing in size and diversity, the species resembled modern day crocodiles. The climate at the time was humid and hot and had a vast amount of plant life. The sixth and final period was the Permian Period during this period there was the biggest mast extinction to ever come. The climate went through extreme conditions. The supercontinent of Pangea had…

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    Germination Lab Report

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    above are received and the process of germination begins. (http://www.buzzle.com/articles/seed-germination-process.html) Once the conditions are received the seed absorbs water and the seed breaks open the seed coat (the embryo enlarges from receiving food from the endosperm). The radicle is the first root that breaks through the embryo towards the earth where it absorbs nutrients and water. The hypocotyl is a hooked shaped structure that can be found on dicots. It is the first thing to…

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    segments are flanked by a network of matching ORFs. This fact also supports the hypothesis that all the segments are descendent of a common template. Conclusion Comparative plant genome analysis allows us to further understand the function and evolution of genes at various levels. With whole-genome sequences available at our disposal, we are able to go deeper into diverse areas of biological research. Even though it is not yet possible to have ever organism sequenced in the near future, the…

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    Brassica Rapa Seeds

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    An Investigation of the Effects of Cytokinins during the Germination of Brassica rapa Seeds Germination is a vital stage in a plants life, but it also plays a significant role in other animals’ (including humans) life cycle. It is the process in which a new plant grows from a seed. Due to the fact that plants are autotrophs; they use the process of photosynthesis to transform sunlight and make their own food. Germination occurs in gymnosperms and angiosperms when the seed is using its own…

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