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Zooxanthellae in the construction of the role of coral reefs

Space, not to the coral growth in this direction, they only see the light along the direction of expansion, which is due to zooxanthellae photosynthesis in the light conditions was carried out (Article 27 of the next turn) informed of a 19 - Methodology requirements to guide the students to practice on the development of scientific practical ability is beneficial. Such as access to scientific observation and experiment is the fact that the basic methods and scientific research necessary steps. Students conducting observations and experiments carried out in accordance with regulatory requirements, can not be satisfied look and a finger. Observation is a purpose, planned, and consciously accept and be processed outside information to perceive the outside world in the process. Observation is different from the \To guide students to think about the objectivity of observation, the possibility, reliability and value; then asked to consider the use of observation tools to observe and quantitative methods; be in accordance with the observation, explanation and description of the initial 3 steps to complete the observation mission. This observation on the nature, depth, detailed, proud to insight, understanding and description. 16,17 century naturalist to observe nature, find new and different plant groups, the establishment of a taxonomy. Bionics is fine for some biological observations generated. Experiment is observed under conditions in the artificial control of the object and obtain the desired scientific facts in order to more deeply reveals the essence of things. Experiments are the basic elements of scientific method, which includes design, implementation and interpretation of three steps, the students tended to focus on the implementation of the neglect of explanation, design is often replaced by the teacher. Teaching should be a high degree of scientific methodology to the requirements of proposed experimental tasks,[link widoczny dla zalogowanych], study the relevant theory,[link widoczny dla zalogowanych], experiments need to control the variables,[link widoczny dla zalogowanych], the assembly of experimental equipment, serious operation, observation, measurement, make a scientific explanation. History of science can educate students about the fact that each step is important experiment. Such as interpretation, British scientists in 1951 by X-ray photographs Franklin discovered DNA helix technology, and made speeches, but then gave up the findings. Watson and Crick DNA structure in the study made on the basis of correct interpretation, presented in 953】 double helix model of DNA obtained the Nobel Prize. Only the interpretation of scientific experiments in order to reveal the nature of things. Scientific methodology in biology education is the teaching content resides within the biology students to practice throughout the activities. By introducing the history of biology, biologists and learning biology techniques introduced, give full play to scientific methodology in the biological function of teaching in science education, scientific literacy for the students have a direct effect or a subtle role. (Continued from page 1d) 1 from the oral disc with a vertical cut a small piece of lip without tentacles, renewable a mouth, but no tentacles, and intestinal worm body. 2. District to cut a piece from the tentacles, renewable disc and the vertical export of lips, but no intestinal worm body. 3 truncated intestinal worm-like tentacles body can regenerate new tentacles. The tentacles are cut off most of its students a small population base. 4. Tentacle zone in the lower section of intestinal worm cut body, renewable disc and tentacles export 5. The lower body from the intestinal worm-like cut sections, most can be quickly developed into a complete intestinal worm-like body, with 1 or 2 feet or no feet reproductive reproductive root root. 6. Separation of the endoderm can not regenerate. 7. Ectoderm isolated at 7 ~ 1l days renewable, develop into intestinal worm-like body,[link widoczny dla zalogowanych], the size and number of its tentacles, separated according to the size of the ectoderm. 8. Since the intestinal worm-like body of the upper cut a slice, can be recycled poles 9. Intestinal worm-like body was slit 1 / 4, and its exports and down the side lip of renewable, since the notch edge of the formation of new tentacles. (Continued from page l9) good reason. Also due to the vertical distribution of coral zooxanthellae in coral larvae memory's sake decision. All the vertical distribution of reef corals is limited to shallow depth of less than 80m, as zooxanthellae plants only under conditions in order to see the light for photosynthesis,[link widoczny dla zalogowanych], the release of oz, create coral reef organisms for the provision of O and nutrition. But the depth of more than 80m, the light is very weak, the zooxanthellae photosynthesis in this depth were too weak or can not, under these conditions coral growth will cease, and some that is just barely sustain life. Therefore, only the shallow waters of the sunny, especially in the 10 ~ 20m water depth of photosynthesis strong development of the coral was able to fully accelerate the formation of the coral skeleton, thus creating the coral reefs. Shows no presence of zooxanthellae, coral reefs created is not possible. Although scholars have recently reported that coral organic nutrient source also suspended, but all can not deny the coral zooxanthellae and the importance of mutualism. Biological phenomenon of symbiosis is common, but as with coral zooxanthellae symbiotic relationship that created a unique miracle - coral reefs are unique. 1993 Vol 28 No. 8 Bulletin of Biology for a 27 -