How to test the chemistry and biology experiment in high school?
As for the chemistry and biology experiment test in the first year of high school: - ** Examination Target **: Students of Grade 2023 (Grade One) who have the status of ordinary high schools in Shaanxi Province, students of Grade 2023 who have the status of other high schools in Shaanxi Province (including professional high schools, ordinary technical secondary schools, adult technical secondary schools, and technical schools), high school graduates with Shaanxi Province household registration, and social personnel with Shaanxi Province household registration (those who have graduated from junior high schools or are older than 15 years old and do not have high school status and graduation certificates). - ** Exam subjects and selection requirements **: Year one candidates can apply for chemistry and biology. - ** Exam Questions **: Chemistry and Biology each have 4 experimental operation questions for the examinees to draw lots to choose 1 question as the test question. Among them, the fourth test questions of chemistry and biology were divided into two operation methods, A and B (namely, A was the conventional experiment operation, B was the digital experiment operation). The digital experiment operation pilot counties (districts) selected the digital experiment operation B. The examination questions (including the scoring rules and score cards) were organized by the subject experts of the Education Technology and Equipment Management Center of the Provincial Department of Education. They were based on the curriculum standards and the actual situation. - ** Examination Organization and Execution **: The education administrative departments of each city (district) are specifically responsible for the organization and implementation of the examination in their respective jurisdiction. Each county (district) education administrative department shall arrange a fixed examination site, organize and complete the experimental operation examination for the non-ordinary high school students who register for the academic level qualification examination within their jurisdiction, and implement the evasion system for the invigilator of the experimental operation examination. - ** Scoring points **: The chemistry experiment operation test is mainly based on basic experimental methods, operating skills, experimental ability, experimental habits, and other aspects. The scoring points may be designed from three aspects: experimental steps (such as correct installation or connection of experimental equipment and scoring of key links), experimental data (correct recording, calculation, image and chart processing, and reasonable conclusion), experimental habits (compliance with discipline, equipment placement, standard of taking and placing equipment, orderly operation, and equipment sorting and restoration). The number of points to be graded was determined based on the proportion of points. Although the biology experiment exam did not explicitly mention the specific scoring points, the general direction should be similar to the chemistry experiment to evaluate the students 'abilities in the experimental operation. Read more exciting novels for free
High school biology experiment DNA
High school biology experiments mainly involved observing the distribution of DNA and DNA in cells, as well as the rough extraction and identification of DNA. In the experiment to observe the distribution of DNA and DNA in cells: - The principle was to use the methylate-green pyronine dye solution to dye DNA and R A. The methylate-green dye solution made the DNA appear green, and the pyronine dye solution made the R A appear red. From this, it could be observed that DNA was mainly distributed in the nucleus (dyed green), and R A was mainly distributed in the plasma (dyed red). - For the selection of materials, oral cells or onion inner skin cells (colorless) were often used to avoid color interference. - The effects of the reagents in the experiment: 0.9% NaCl-solution (physiological salt solution) could maintain the normal form of oral cells;8% sulfuric acid could change the cell membrane's penetrability, accelerate the dye to enter the cells, and also separate the DNA and protein in the embryos, which was beneficial to dyeing; the methyla-green pyronine dye solution needed to be mixed and used immediately. In the DNA extraction and identification experiment: - The principle was as follows: - DNA and protein had different degrees of dissolution in different concentration of NaCl-solutions. - DNA was not dissolved in alcohol, but some of the protein in the cells was dissolved in alcohol, which could be used to further separate DNA and protein. - The DNA turned blue after being heated in a boiling water bath. - Operation process: - The materials were selected from biological tissues with relatively high DNA content. Take chicken blood as an example. When breaking the cells, the chicken blood cells were mixed with distilled water, stirred with a glass rod, and then filtered with gauze to collect the filtered liquid. - The impurities were removed by controlling the concentration of the NaCl-solution to remove the impurities. - The extraction of DNA was to filter the processed solution and add a cooled 95% alcohol solution with the same volume as the filtered solution. - The identification of DNA was to add the diamidinium reagent to the solution containing DNA. After mixing it evenly, the test tube was placed in boiling water and heated for 5 minutes. If the solution turned blue, it proved the existence of DNA. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Advanced high school physics, chemistry, and biology
High School Mathematics, Physics, Chemistry, Biology, Formula Theorems, and Required Knowledge Complete Solution to the Key Points of High School College Entrance Examination Knowledge General Review (Jiangxi People's Press) could be used as review materials for high school mathematics, physics, and chemistry students. In addition,"King of Problem Solvers" was also a mathematics, physics, and chemistry study reference book suitable for Grade One, Grade Two, and Grade Three students. It was universal across the country. It contained three sections: "Top Student teaches you the outline,""Top Student teaches you how to solve problems," and "Top Student helps you avoid mistakes." Buying mathematics, physics, and chemistry subjects could also obtain a breakup book and video tutorial. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Simulation Junior High School Biology Experiment
The following was some content related to the junior high school biological simulation experiment: ** I. Virtual simulation experiment between Hengdian and universities ** 1. ** Specialties ** - Build a completely virtual experimental environment based on real-life data collection. It could bring about an immersive and interacting teaching experience. The images were highly simulated and could present mechanisms that were difficult to observe. - It avoided the problems of high investment, high risk, difficulty in grasping, and difficulty in observation in biological experiments. - Based on the concept of MOOL (large-scale online open laboratory), the addition of interaction and operational experimental content on the basis of paying attention to the content of the course was the development of MOOCs, focusing on cultivating students 'practical, investigative, and innovative abilities. - With the students as the center, the difficulty of the course was gradual and focused on all-round development. There was a more scientific, comprehensive, and systematic evaluation system, which made it easy for teachers to teach according to their aptitude, control the teaching progress, adjust the teaching strategy, and fully implement the concept of opening and sharing. 2. ** Meaning of application ** - It was a new tool to change education by bringing revolutionary educational innovation to college biology courses. ** 2. Ju Dao Junior High School Biology VR 3D Virtual Simulation Laboratory (demo version)** 1. ** Specialties ** - It is guided by the core accomplishments of the subject, scientific, inquiring, and open. The equipment had been modeled with high precision and could be displayed in all directions and angles. - Relying on a powerful intelligent algorithm engine and 3D engine, it guarantees the accuracy of experimental data and the high accuracy of experimental phenomena. It had a high degree of freedom of interaction, timely and clear operation prompts and error prompts, and simple and efficient operation. - It could restore the real experiment process to the greatest extent and complete scenes that were difficult to achieve in traditional laboratories, such as microscopic, macro, and dangerous experiments. - It meets PC mouse, keyboard, and touch screen operation, has VR/3D immersive operation mode, and supports mainstream VR devices to make knowledge more intuitive and interesting. It is suitable for normal teaching and innovative education modes. 2. ** Software module ** - It was composed of a synchronized experiment module, a micro-eye module, a human body exploration module, an evolutionary tree module, and an object library module. 3. ** Synchronization experiment module content ** - It closely followed the curriculum standards and met the teaching needs. It covered six major knowledge points, including biology and cells, and people in the biosphere. The experiment catalog included student group experiments, teacher demonstration experiments, and important knowledge points. Each experiment had a detailed introduction to meet the needs of preparation and review. It can visualize the abstract and virtual phenomena in the experiment, which is convenient for students to understand. 4. ** Micro-Eye Myriad module content ** - There were nearly 100 high-definition microscope images, covering zoology, botany, biology, and microbiology. It supported the free switching of 4×, 10×, and 40×. It was suitable for teachers 'teaching demonstration and students' independent observation. Different observation methods were provided, and the image resolution could be adjusted to enlarge and observe. ** 3. Other junior high school biology simulation experiments ** 1. There were also simulation experiments for the production and use of animal models. The purpose was to master the method of making biological models, learn how to use materials to make biological models, understand the development process and current situation of bionics, and cultivate interest in life sciences. The principle was to use animal models to simulate animals and plants in the real environment to learn biological knowledge. Materials and tools such as animal bones or muscle tissue, plastic tubes, and so on needed to be prepared. 2. There is a junior high school biological simulation experiment software. The hardware requirements are: operating system: Windows7 or above, memory: 2GB or above, display resolution: 1024*768 or above, CPU: Intel Core i3 or above. You can download the installation package for free at Guanfang Global Information Station by registering an account. After installing it according to the installation wizard, double-click the desktop icon to open the software. 3. The Judao Junior High School Physics and Chemistry Experimental Evaluation System was based on VR/3D virtual simulation technology to provide a virtual experimental environment and a high sense of immersion. It had intelligent diagnosis and analysis technology to automatically score, diagnose and analyze, and meet the needs of students to practice experimental operations anytime and anywhere. It could be used for schools to organize mock exams and teacher tests. The school could grasp the details of students 'experimental scores and video data and explain the error-prone points. It could also be integrated into provincial and municipal examination platforms to create a test question library for practice or pre-examination simulation. It was convenient for the education department to evaluate the teaching quality and analyze the learning situation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
High School Biology Tadpole Experiment Report
The following is an example of a high school biology tadpole experiment report: ** 1. Purpose of the experiment ** To observe and study the growth and transformation process of tadpoles. ** 2. Experimental Materials ** tadpoles, water tanks, water, spirularia, etc. ** 3. Experimental Steps ** 1. experimental preparation - Collect fresh tadpoles, prepare a water tank, put enough water in the water tank, and add an appropriate amount of spirularia as food for the tadpoles. 2. experimental observation - He gently placed the tadpoles into the water tank and began to observe their living conditions. - In the early days, tadpoles were observed to have curved bodies and undeveloped limbs. They swam by wagging their tails and used spirinoceros as food to shuttle back and forth in the water. Sometimes, they would stop at the edge or bottom of the sink. - As time passed, the tadpoles began to develop four limbs. Their tails gradually shrank, and their limbs gradually became slender. At the same time, they became more active, and their swimming speed and strength increased. - During the growth of the tadpoles, it was also observed that the black pupils gradually became lighter, and the color of the body became more transparent, which may be related to the nutrients contained in the spirularia. - Finally, the limbs of the tadpoles fully developed, and their tails almost completely disappeared, turning into frogs (but smaller). Some of the tadpoles began to come ashore to breathe air, indicating that they were gradually adapting to the land environment. ** 4. Experiment conclusion ** Through this experiment, he had a deep understanding of the growth and transformation process of tadpoles. Tadpoles had a tail, black pupils, relied on water to live, and their limbs were not developed. After a period of growth and development, they gradually developed limbs, their tails degenerated, their body color became transparent, and their black pupils became lighter. They began to adapt to the land environment and finally transformed into a frog-like form. In addition, there were also related tadpole experiments to explore the effect of the hormone on the growth and development of tadpoles. 1. experimental preparation - Two plastic water tanks were filled with an equal amount of tap water, and they were set up as groups A and B. - In the subsequent experimental steps, the two groups of tadpoles might be treated differently (for example, group A was added with hormone, group B was used as a control, etc.), and then the differences in the growth and development of the two groups of tadpoles, including the differences in growth rate and morphous changes, could be observed to draw conclusions about the effects of hormone on the growth and development of tadpoles. The above contents can be adjusted and supplemented according to the actual experimental situation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Writing Method of High School Biology Experiment
High school biology experiments usually included the following important parts: ** 1. Experiment Title ** The main content of the experiment should be clarified, and the core content of the experiment should be summarized concisely, such as "exploring the effect of temperature on the activity of the enzyme". ** 2. Experiment Purpose ** 1. ** Knowledge target ** - Explain the biological knowledge concepts to be understood or verified through experiments, such as "understanding the principle of the effect of temperature on the activity of an enzyme". 2. ** Ability Target ** - He explained the skills to be trained during the experiment, such as "mastering the application of the variable control method in the experiment, learning to use specific experimental instruments for measurement and observation", etc. ** 3. Experiment Principle ** 1. ** Biological Principles ** - Explain the basic biological principles that the experiment is based on. For example, in the experiment of "Observing the plasmatic separation and recovery of plant cells", the principle is that the protoplasma layer of plant cells is equivalent to a semi-transparent membrane. When the concentration of cell fluid is lower than the concentration of the external solution, the cell loses water and plasmatic separation occurs. When the concentration of cell fluid is higher than the concentration of the external solution, the cell absorbs water and plasmatic separation occurs. 2. ** Principle of related technology (if any)** - If special technical means were involved, such as dyeing techniques, the principle must be explained. For example, in the experiment of "Observing the distribution of DNA and DNA in cells", the affinity of methy-green and pyro red stains for DNA and DNA was different. methy-green made DNA appear green, and pyro red made DNA appear red. ** 4. Experimental Materials and Tools ** 1. ** Experiment Materials ** - List the biological materials used, including the types and parts of the organisms. For example, in the experiment of "Observing the Mitosis of Plant Cell", the materials were onion root tips (onions, garlic). 2. ** Experiment Tools ** - Write down in detail the required instruments, reagents, etc., such as microscope, slide, cover glass, disintegration solution, gentian violet dye solution, etc., and indicate the necessary information such as the concentration of the reagent. ** 5. Experimental Steps ** 1. ** Preparing Stage ** - This included the pre-treatment of the experimental materials, such as the cultivation of onion root tips in "Observing the mitosis of plant cells"(3 - 4 days before the experiment, place the onions on a wide-mouthed bottle filled with water, the bottom of which is in contact with the water. The device is placed in a warm place, and pay attention to changing the water frequently. The purpose is to prevent the roots from rotting. Wait until the roots grow to 5 cm). 2. ** Operation procedure ** - Each step of the operation was described in detail in order, including the actions of the operation, the amount of equipment or reagents used, etc. For example, in the experiment of "making and observing the temporary mounting of the onion scale leaf inner skin cells", the rubbing was done.(Wipe the slide clean with a clean gauze, then take a cover glass and wipe it clean. Put the cover glass on one end of the slide for later use.)(Drip 1 - 2 drops of water in the center of the slide with a dropper)(Take a piece of onion scale leaf, cut a small square about 0.5 cm with a blade on the inner skin, and then tear a small piece of transparent film with tweezers)(Dip the peeled inner skin into the water droplets on the glass slide and flatten it with tweezers), cover (use tweezers to pick up the cover glass so that one side of it touches the water droplets on the glass slide first, then slowly put it down and cover it on the material to be observed), dye (then drop a drop of the solution of the solution of 3. ** Points to note ** - During or after each step, the points that needed special attention were indicated. For example, when using a microscope for observation, it was necessary to pay attention to the low power microscope before the high power microscope; when making temporary mounting, it was necessary to keep the experimental materials moist. ** 6. Experiment result ** 1. ** Anticipated result ** - According to the theory and purpose of the experiment, he could deduce the possible results. For example, in the experiment of "exploring the effect of temperature on the activity of an enzyme", if the temperature was within a suitable range, the activity of the enzyme would be higher and the reaction speed would be faster; if the temperature was too high or too low, the activity of the enzyme would decrease, and the reaction speed would slow down or even stop. 2. ** Real-world result (if the experiment has been completed)** - An objective description of the phenomena observed or the data measured during the experiment can be presented in the form of tables, charts (such as bar charts, line charts, etc.), or text. ** 7. Experiment conclusion ** 1. ** Analysis of the results ** - To analyze the experimental results and explain the reasons for the results. For example, in the experiment of "Observation of plasmatic wall separation and recovery of plant cells", the cell structure and physiological mechanism of plasmatic wall separation or recovery were analyzed. 2. ** Come to a conclusion ** - According to the analysis of the results, the final conclusion of the experiment should be summarized. The conclusion should be closely related to the purpose of the experiment, such as "temperature has a significant effect on the activity of the protein. Within a certain range, the activity of the protein increases with the increase of temperature. After exceeding the optimal temperature, the activity of the protein decreases with the increase of temperature." ** 8. Analysis of errors (if any)** 1. ** Source of error ** - Find out the factors that may cause the experimental results to be inconsistent with expectations, such as the accuracy of the experimental instrument, the individual differences in the experimental materials, and human errors in the operation process (such as errors in measuring reagents, etc.). 2. ** Modification measures ** - In view of the source of error, the improvement methods were proposed, such as improving the accuracy of the instrument, increasing the number of experimental samples to reduce the influence of individual differences, and regulating the operation process. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Chemistry and Biology School
Some of the schools that offered chemical biology majors were Shanghai Jiao Tong University, Anhui Medical University, Hebei University, Hunan University, South-Central University for Nationalities, Tianjin Polytechnical University, Beijing Polytechnical University, Beijing University of Aerospace, Henan Agricultural University, etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Chenghai Biology Experiment Operation Test
On May 26 - 27, 2015, the Chenghai District Education Bureau organized the relevant middle schools to conduct the junior high school biology experiment operation assessment. The teaching station and the teaching and research section formed an inspection team to inspect the assessment work of each school, focusing on the examination room preparation, organization work, and the proficiency of the students. The main contents of the assessment included observing the onion scale leaf inner skin cells, tomato pulp cells, human oral cavity cells, and the structure of the leaves with a microscope. The cells of the lower surface of Chinese kale leaves and the leaves of wall moss. There was no more information about Chenghai Biological Experiment Operation Test, so he could not answer accurately. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How did high school chemistry and biology score?
In the new college entrance examination in Yunnan, chemistry, biology and other four re-elected subjects such as ideology and politics, chemistry, geography, and biology were included in the total admission score of ordinary colleges and universities, while Chinese, mathematics, foreign languages, physics, and history were based on original scores. The grading method for the grade conversion was as follows: First, the examinees were divided into grades according to their original scores. Grade A accounted for 15% of the examinees, and the score range was 100 - 86 points; Grade B accounted for 35% of the examinees, and the score range was 85 - 71 points; Grade C accounted for 35% of the examinees, and the score range was 70 - 56 points; Grade D accounted for 13% of the examinees, and the score range was 55 - 41 points; Level E accounted for 2% of the population, and the score range was 40 - 30 points. Then, according to the grading formula (y2 - y)/(y-y1)=(x2 - x)/(x-x1), the examinee's original score would be converted into the corresponding grade score (When the college entrance examination results were inquired, the examinee would get the converted score, so there was no need for the examinee to calculate it himself). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Which is easier to raise in high school biology or chemistry?
In terms of the difficulty of raising points, living creatures were relatively easier to raise points. In the college entrance examination, biology was the "liberal arts of science", so there were many knowledge points that needed to be memorized. Most examinees could get high marks by memorizing them hard, and more students could easily get higher original marks in the biology exam. Moreover, biology did not become too difficult in high school. Instead, it paid more attention to details. As long as one had a serious understanding of the textbook and worked hard on the details, it was relatively easy to raise the score. In contrast, chemistry had certain requirements for students 'imagination, logical derivation, basic knowledge, and comprehensive quality. High school chemistry knowledge was concentrated and systematic, and students needed to spend a lot of time studying hard in exchange for relatively stable good results. The subject was more divided into two in the third year of high school. Those who did well could easily get high marks, while those who did not do well would have more trouble. At the same time, under the scoring system, it was more difficult to raise the chemistry ranking. The higher the score, the more difficult it was to raise the score, and the smaller the increase in score. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to improve chemistry and biology in senior high school
For the improvement of senior high school chemistry, one could start from the following aspects: - Basic knowledge: - During the first round of review, one had to deeply understand the chemistry knowledge points and recite them carefully. They had to prepare the textbook content, solve the knowledge points that could be solved by themselves, mark the places that they did not understand, focus on listening in class, sort out the key knowledge after class, and build a knowledge network according to the framework. - He summarized the error-prone points and knowledge points that were not covered in the textbook during the questions and exams. - Questions: - Chemistry questions were divided into knowledge questions and regular skill questions. For simple multiple-choice questions that tested basic concepts and the basic properties of matter, he could do it right as long as he mastered the knowledge points. - For regular skill questions such as chemistry questions, he had to summarize the wrong questions, study the question types and answers, and form his own answer template. There were the following methods to improve the biology of Grade Three: - Students with weak foundations: Carefully study the biology textbook, including the corners, diagrams, bold characters, etc., at least eight times, to reach the level of 60 - 70 points. - Students who wanted to improve further: - Using the classification method to sort out a large amount of concept or structural knowledge. - Use the graphic induction method to grasp the principles and laws of knowledge. - He used the association transfer method to discover the commonality between the knowledge points. - The knowledge was compared horizontally and vertically through comparison review. - He used the serial review method to connect the scattered knowledge points and fully understand the knowledge. - When making multiple-choice questions, one had to analyze each choice regardless of whether it was right or wrong. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>