More learning summary recommendation (click to enter ↓↓↓ ↓)
After learning this semester, summarize the study plan for next semester.
A summary of English learning for postgraduate entrance examination
Summary of Political Theory Learning _ 6 Learning Experience of Political Theory
Senior two summed up the plan for the next semester last semester.
Summary and reflection of this semester
Learning experience summary model essay
Model report format of biological experiment 1
Experimental name: Observe chloroplast and cytoplasm flow with high power microscope.
First, the experimental purpose
1. Initially master the use of high-power microscope.
2. Observe the morphology and distribution of chloroplasts in the cytoplasm of higher plants.
Second, the experimental principle
Chloroplasts in higher plants are oval. Under different light conditions, chloroplasts can move and change the direction of ellipsoids, so that they can receive more light without being burned by strong light. Under strong light, chloroplast faces the light source with one side of its ellipsoid; In weak light, chloroplasts face the light source with the front of their ellipsoids. Therefore, the shape of chloroplast ellipsoid in pumpkin leaves collected under different light conditions is not exactly the same.
The cytoplasm in living cells is in a state of constant flow. Observing the flow of cytoplasm can be marked by the movement of chloroplasts in cytoplasm matrix.
Third, materials and appliances.
Moss leaves, fresh black algae, microscope, glass slide, cover glass, dropper, tweezers, blade, Petri dish, pencil.
Fourth, the experimental process (see p30)
1. Make a temporary scaffold for moss leaves
2. Observe chloroplasts with a microscope
3. Making temporary fragments of the leaves of the black algae
4. Observe the cytoplasmic flow with a microscope.
Discussion on verbs (abbreviation of verb)
1. Is the chloroplast in the cytoplasmic matrix still there? Why?
2. What is the relationship between chloroplast morphology and distribution and chloroplast function?
3. The cytoplasm of plant cells is in a state of continuous flow. What is the significance of living cells completing life activities?
4. Draw a leaf cell with a pencil and mark the general flow direction of chloroplasts.
Model essay on the format of biological experiment report II
Identification of Reducing Sugar, Fat and protein in Experimental Biological Tissues
First, the experimental purpose
Master the basic methods of identifying reducing sugar, fat and protein in biological tissues.
Second, the experimental principle
1. Identification principle of reducing sugar There are many common reducing sugars in biological tissues, such as glucose, fructose and maltose. They all contain reducing groups (free aldehyde groups or free ketone groups) in their molecules, so they are called reducing sugars. There is no free hemiacetal hydroxyl group in sucrose molecule, so it is called non-reducing sugar and has no reducibility. In this experiment, the existence of reducing sugar in biological tissues can only be detected by using Lin Fei reagent, but non-reducing sugar can not be identified.
Linfei reagent is prepared from sodium hydroxide solution with mass concentration of 0. 1 g/ml and copper sulfate solution with mass concentration of 0.05g/ml. After the two solutions are mixed, a light blue cu(oh)2 precipitate is formed immediately. When cu(oh)2 and glucose are heated, brick-red cu2o precipitate can be formed, and glucose itself is oxidized to gluconic acid. The reaction formula is as follows:
ch2oh—(choh)4—CHO+2cu(oh)2→ch2oh—(choh)4—cooh+Cu2O↓+2h2o
When the reducing sugar is identified by Fehling reagent, the color change process of the solution is light blue, brown brick red (precipitation).
2. protein's identification principle When identifying whether protein is contained in biological tissues, biuret method is commonly used and biuret reagent is used. The biuret reagent consists of sodium hydroxide solution (a) with a mass concentration of 0. 1 g/ml and copper sulfate solution (b) with a mass concentration of 0.0 1 g/ml. In alkaline solution (naoh), biuret (H2NOC-NH-ConH2) can react with cu2+ to form purple or purplish red complex, which is called biuret test. Because protein contains many peptide bonds similar to biuret, protein can react with biuret reagent.
3. The identification principle of fat can be dyed orange with Sudan III and red with Sudan IV.
Iii. experimental process (see p 18 in this book)
Four, experimental supplies (see this book p 18)
Verb (short for verb) attention
1. About the experiment of identifying reducing sugar, when heating the solution in the test tube, the upper part of the test tube should be clamped with a test tube and heated in a big beaker filled with boiling water. Note that the bottom of the test tube should not touch the bottom of the beaker, and the mouth of the test tube should not face the experimenter, so as to avoid rushing out of the test tube when the solution in the test tube boils, causing burns. If the solution in the test tube is too boiling, you can lift the test tube clamp and let the bottom of the test tube leave the boiling water in the big beaker.
2. The solution A and solution B of Linfei reagent can be used only after they are mixed evenly. Do not add solution A and solution B to the tissue sample solution separately.
3. In the identification of protein, biuret A was added first, and then biuret B was added.
Discussion on intransitive verbs
What is the basis for identifying reducing sugar, fat and protein in biological tissues?
Model essay on the format of biological experiment report 3
First, the experimental purpose
1. Observe the process of plant cell mitosis and identify the different stages of mitosis.
2. Master the skills of making mitotic slices of onion root tips.
3. Master the method of drawing biological map.
Second, the experimental principle
In plants, mitosis is common in secondary cells such as root tip and stem tip. The mitotic process of higher plant cells can be divided into interphase and prophase, metaphase, anaphase and anaphase. The mitotic process of plant cells can be observed by high-power microscope, and the mitotic stage of cells can be identified according to the changes of chromosomes (or chromatin) in each period, and the chromosomes in the nucleus are easily stained by alkaline dyes.
Third, materials and appliances.
Onion root tip, microscope, glass slide, cover glass, dropper, tweezers, Petri dish, pencil, hydrochloric acid with mass fraction of 15%, alcohol with volume fraction of 95%, and gentian violet (or purple liquid) with mass fraction of 0.0 1g/ml.
Fourth, the experimental process (see p39)
1. Cultivation of onion root tips (3-4 days in advance)
2. Dissociation: 5 minutes
3. Rinse: 10 minute
4. Dyeing: 5 minutes
5. Production
6. Metallographic test
Verb (short for verb) attention
The complete dissociation of 1. is a necessary condition for the success of the experiment. Only when the tissue is fully dissociated can the tissue be dispersed and the cells will not overlap.
2. The washing time must be enough, otherwise the cells will not be stained.
3. When dyeing, the concentration of dye solution and dyeing time must be mastered. In particular, the dyeing should not be too deep, otherwise it will be purple under the mirror and cannot be observed.
Discussion on intransitive verbs
1. What is the key to making mitotic slices of onion root tips? Talk about your own experience.
2. After observing the cells in each mitotic stage, draw the mitotic sketch of onion root tip cells and mark the period.
Model essay on the format of biological experiment report 4
Laboratory is the main place for students to study and carry out experiments, the main resource for biological inquiry learning and an important way for students to carry out scientific inquiry. Therefore, the school attaches great importance to the construction of biological laboratory, and configures necessary instruments and equipment to ensure that every student can carry out experimental inquiry activities, which creates good conditions for students to carry out experimental inquiry activities. Through experiments, students can most effectively master the basic biological knowledge necessary for further study of modern science and technology, and cultivate their initial practical skills and innovative ability. The focus of teaching is to cultivate students' scientific experiment ability and improve their scientific experiment literacy, so that students can improve their self-study ability, comprehensive analysis ability, practical ability and design innovation ability while acquiring knowledge.
I. Guiding ideology
In line with the concept of serving students, cooperate with subject teachers to carry out experimental teaching and cultivate students' skilled experimental operation skills.
Second, the key work
1. Equip new experimental instruments for new curriculum teaching.
2. Ensure that each experiment is carried out in time with good quality and quantity as required.
3. Cooperate with any teacher to strengthen the study of textbook knowledge for students of all grades.
Third, specific work.
1, 100% set up demonstration experiments and student experiments, and arrange each experiment according to the requirements (ensure the quantity and quality) before the teacher attends class, and never delay the teaching.
2. Visit the laboratory during the experimental class to help the teacher solve problems. If the instrument is broken and the reagent is not enough, repair it, guide the operation method and help students correct their mistakes.
3, after the experiment, timely check the quantity and quality of the instrument, if there is any error, according to the system processing; Timely supplement the dose to ensure the smooth progress of the next experiment; Make relevant experimental records (such as time, number of people, places prone to failure and improvement methods, etc.). ).
4. Improve the management system, such as Management System for the Use of Laboratories and Instrument Rooms, Laboratory Safety Code, and Provisions on Compensation for Glass Damage Related to Laboratories. , and stick it on the wall. Clean regularly, so that the instruments are dust-free and the classroom is clean and tidy.
5. Proofread the accounts at the beginning and end of each period to ensure consistency, and make relevant loss reporting records. Usually check the experimental instruments and supplies regularly, repair them in time if they can, and purchase them in time if they are insufficient.
6, supplement the experimental equipment needed for the new curriculum teaching.
Fourth, strengthen safety awareness to ensure laboratory safety.
Ensure the safety of the laboratory, clarify the responsibilities of the laboratory, regularly check fire-fighting equipment, and establish a safety inspection system of self-inspection by the person in charge and random inspection by the laboratory. Strengthen safety awareness.
Give priority to the person in charge of laboratory safety, cooperate with the experimental guidance teachers and department leaders for their care and support, and cooperate with students to ensure that all kinds of safety accidents do not occur in the laboratory throughout the year.
Model essay on the format of biological experiment report 5
Experimental name: Observe chloroplast and cytoplasm flow with high power microscope.
First, the experimental purpose
1. Initially master the use of high-power microscope.
2. Observe the morphology and distribution of chloroplasts in the cytoplasm of higher plants.
Second, the experimental principle
Chloroplasts in higher plants are oval. Under different light conditions, chloroplasts can move and change the direction of ellipsoids, so that they can receive more light without being burned by strong light. Under strong light, chloroplast faces the light source with one side of its ellipsoid; In weak light, chloroplasts face the light source with the front of their ellipsoids. Therefore, the shape of chloroplast ellipsoid in pumpkin leaves collected under different light conditions is not exactly the same.
The cytoplasm in living cells is in a state of constant flow. Observing the flow of cytoplasm can be marked by the movement of chloroplasts in cytoplasm matrix.
Third, materials and appliances.
Moss leaves, fresh black algae, microscope, glass slide, cover glass, dropper, tweezers, blade, Petri dish, pencil.
Fourth, the experimental process (see p30)
1. Make a temporary scaffold for moss leaves
2. Observe chloroplasts with a microscope
3. Making temporary fragments of the leaves of the black algae
4. Observe the cytoplasmic flow with a microscope.
Discussion on verbs (abbreviation of verb)
1. Is the chloroplast in the cytoplasmic matrix still there? Why?
2. What is the relationship between chloroplast morphology and distribution and chloroplast function?
3. The cytoplasm of plant cells is in a state of continuous flow. What is the significance of living cells completing life activities?
4. Draw a leaf cell with a pencil and mark the general flow direction of chloroplasts.
Model essay on the format of biological experiment report _ Related articles on the template of biological experiment report:
★ Model essay on format of biological experiment report
★ Summary of Political Theory Learning _ 6 Lessons from Political Theory Learning
★ ? A summary of English learning for postgraduate entrance examination
★ ? Personal learning summary 3 articles
★ ? High school students' learning summary 1000 words.
★ ? After learning this semester, summarize the study plan for next semester.
★ Report on the seventh grade biological experiment
★ Report on the seventh grade biological experiment
★ Reference answer of the seventh grade biological experiment report
★ The answer to the second volume of the seventh grade biological experiment report book.