How to take a biology lab class, biology experiment steps

Experimental teaching is one of the basic forms of biology teaching, and many activities are also carried out through experiments in the best learning advocated by the curriculum standards. Therefore, it is particularly important to strengthen experimental teaching and explore knowledge with experimental methods, so the experimental class should not only be taken, but also taken well, so how to take a good experimental class?

1. Careful preparation before the experiment.

1.Before taking the biology experiment class, the experimental group should be formed, and the group number and seat number should be seated and fixed. It can avoid the chaotic situation caused by students competing for seats, and at the same time, it is conducive to the storage of experimental equipment.

2.Teachers should repeatedly explain the importance and significance of the experimental course, so that the students have a clear purpose and a correct attitude towards the experimental class, so that they can concentrate on the experiment and operate according to the norms. Teachers should assign students to preview and clarify the principles, objectives and steps of this experiment, especially to remember the operation steps of the experiment and understand the whole experimental process one by one.

3.Teachers should first study the syllabus carefully, study the teaching materials, clarify the purpose, content, key points and difficulties of the experiment, design the board book and teaching plan, carefully design and arrange the specific steps of the experimental course, and prepare the experimental instruments, drugs and experimental teaching materials to ensure the smooth progress of the experimental class.

4.Teachers should operate the experimental techniques at least once, and should be aware of the mistakes that are likely to occur in the experimental process, and have foresight of various experimental phenomena of students.

2. Do a good job in demonstration experiments and student experiments in the experiment.

Demonstration experiments provide students with the opportunity to observe, and student experiments provide students with the opportunity to conduct experiments and directly operate observations, which can not only satisfy their strong curiosity and desire for knowledge, but more importantly, cultivate students' experimental operation skills in the process of hands-on experiments. In the process of the experiment, the teacher must not leave the laboratory, inspect the table by table, understand the progress of each group of experiments, find problems in time and guide students to solve them, and urge students to do a good job in class, only in this way, in the next experiment, they will pay attention to and do it seriously.

3. Strengthen the cultivation of students' experimental ability.

The rectification of the course standard emphasizes more sexual experiments, and strengthening the cultivation of students' experimental design ability is also a particularly worthy issue. Let the students put forward the problems they want to explore, then provide them with the necessary conditions and equipment, let them seek their own ideas to solve the problems, draw up their own experimental plans, independently complete the experimental operations, phenomenon records, analysis results, and finally draw their own conclusions. For example, when talking about "cells", students observe the temporary sections they make through a microscope, gain a deeper understanding of the composition of plant cells and animal cells, and draw a structural diagram of plant cells and animal cells according to the observed facts, so as to summarize the similarities and differences between the two, and cultivate students' abilities in various aspects.

In short, experimental teaching is an indispensable auxiliary teaching of biology teaching, and we should do our best to carry out it well in the future teaching to improve students' interest in biology learning.

Are you a teacher or a student? It's not a clear question. As a student, the key to a good experimental class is to understand the experimental principle and the purpose of each step in the experimental steps, especially the setting of experimental variables should follow the principle of single variables, and the next step is to exercise the hands-on ability to do experiments, and observe the experimental results or statistical data.

As a teacher, you should guide students how to better understand the inner knowledge of this experiment.

The experimental steps for <> biology are as follows:

1.According to the experimental topic, the purpose of the experiment is clarified, and the experimental principle is analyzed and determined.

First of all, it is necessary to clarify what kind of experiment to do, what problems need to be solved, and then what kind of experimental principle you want to base on.

It should be noted that the experimental principles used must be proper, reasonable, and accurate.

2.According to the experimental principle, the experimental object is determined.

Even the selection of appropriate experimental materials is also a key to the success of the experiment.

3.Formulate hypotheses.

According to the experimental topic, a preliminary hypothesis is proposed, and a detectable hypothesis is proposed for the visible phenomenon.

4.Make experimental anticipations.

Before testing experimental hypotheses, the expected results of the experiment are presented. If the expected outcome is achieved, the hypothesis is true; Otherwise, the assumption is not valid.

5.Design experiments.

According to the purpose of the experiment and the hypothesis proposed, determine the basic idea of the experiment, determine the selection of materials, equipment and experimental control, etc., and design the specific methods and steps of the experiment, and operate according to the designed scheme.

6.Observe and record experimental phenomena and collect data to objectively observe and record experimental phenomena, obtain experimental results, and present the experimental results in a certain way.

7.Analyze and draw conclusions.

The recorded experimental phenomena and results are sorted out and analyzed, and general generalized judgments are summarized, and concise summaries are made in the form of words, **, and drawings.

8.Deduction. Draw conclusions based on reasoning based on experimental facts.

9.Communicate, write an experiment report.

Observe the flow of blood within the tail fin of a small fish

Material utensils: live small fish with little caudal fin pigment, microscope, petri dish, dropper, cotton wool (gauze).

Method steps: 1. Take a small live fish with little pigment in the tail fin, and wrap the gill cover and trunk of the head of the small goldfish with soaked cotton wool to expose the mouth.

and tail. Note: To control the beating of small goldfish, it is best to wrap soaked cotton wool around the gill cover and trunk of the head of the small fish all the way to the tail.

Fins, exposing only the mouth and caudal fins.

2. Place the small goldfish in a petri dish so that the tail fin is flat on the petri dish.

Note: Small fish will bounce in the Petri dish, and the slide should be covered on the caudal fin after the fish have settled.

3. Place the petri dish on the stage and observe the flow of blood in the caudal fin vessel with a low-powered microscope.

Note: It is best to use a low magnification lens when observing. This is because when viewed with a low magnification, the field of view is brighter, although the image is smaller.

4. Find the blood vessel with the smallest diameter and pay attention to the flow of blood in this blood vessel.

5. Pay attention to what blood vessels branch from the smallest diameter and what blood vessels it eventually joins.

Note: 1) During the observation process, a dropper should be used to drip water on the cotton wool (too much dripping water will affect the observation), so that the gills of the fish are always moist and the small fish are less harmed as much as possible. If the time is too long, you can put the small fish back in the tank and take another small fish to observe.

After the experiment, the small fish are returned to the fish tank.

2) When observing the blood flow in the tail fin of the small fish with a microscope in winter, the small goldfish should be placed on the left 30 before the experiment.

Soak in warm water right for 2-3 minutes to accelerate its metabolism and make the blood flow noticeable.

There are six steps:

1.Ask questions.

2.Make assumptions.

3.Make a plan.

4.Implementation plan.

5.Draw conclusions.

6.Expressive communication.