Does light affect the life of a rat woman? 65

The rat woman, also known as the "tide insect", is also called the "watermelon insect" in the south, and belongs to the invertebrate arthropod phylum Crustacean tide insect suborder. Their bodies are mostly ovate, dorsal and ventral flattened, and often curled into clumps; It is a herbivorous terrestrial group with chewing mouthparts; It is the only crustacean fully adapted to life on land, from the seashore to the highlands at an altitude of 4,700 metres. There are many types of rat women, the first antennae are short, the last seven pairs of thoracic limbs become gaites, especially the breathing of the abdominal limbs, etc., are the results of adaptation to life on land.

However, they all need to live in moist, warm and sheltered places, and are not as highly adapted to land life as insects and spiders. The rat woman is an experimental animal in the first volume of the seventh grade "The Influence of Light on the Life of the Ratwoman" in the seventh grade of the "Standard Experimental Textbook of Compulsory Education Curriculum - Biology", and this experiment is the first ** activity in the book. The main purpose is to enable students to understand the general process of ** and appreciate the importance of controlling experimental variables and setting up control experiments; To understand the behavior of rat women in choosing their living environment, so as to understand the environmental factors that affect the survival of organisms; Forming feelings of love for laboratory animals; Learn to carefully observe and record and try to complete a complete experiment report; Learn to express the results correctly and communicate fully with other students.

This experiment takes a long time from preparation to implementation, especially in the process of collecting and experimenting with rat women, which involves the storage and rearing of rat women.

Yes, we can do an experiment:

Research reports investigating rat women.

One. Identify the problem.

When I turn over the garden, the pots and stones in the garden, I often see some small animals with slightly flattened, oblong, gray-brown or black bodies crawling, this is the rat woman, and I know that they are called tide insects by looking through the materials. When we moved the pots or stones, the rat woman quickly crawled away. Why is that?

Is it because the environment is brighter? With this question in mind, I did this interesting study.

2. Ask questions.

Rat women like to live in **?

Three. Suppose you like the shade.

Four. Materials & Tools.

1, a rat woman.

2, 3 wet soil, 1 iron basin.

4. 1 piece of cardboard.

5. 1 glass plate.

Five. Study Steps:

The number of rat women in bright and dark places is counted 10 times per minute.

7. After the survey and statistics, the results will be organized into charts and text descriptions as research reports.

Six. Findings:

After 10 surveys, the number of rat women found in each sample area is as follows:

Table 1: Statistics on the number of rat women in different sample areas.

Sample area Time: October 1, October 2, October 4, October 6, October 7 Total.

Playground 0 0 0 0 0 0

3 5 7 4 6 25 in the flower bed

Sewer 4 7 5 6 8 30

0 0 0 0 0 0 0 on the roof

2 4 6 5 7 34 in pots

Inside the lawn 3 4 5 7 6 25

0 1 0 2 0 3 in the hallway

Middle School Biology Experiment, **The Effect of Light on the Life of Rats.

Light has an effect on the distribution of rat women, according to the experiment of the effect of light on rat women, the dark side has more rat women, and the strong light side has fewer rat women, so it is concluded that rat women like dark environments and have a certain resistance to light.

**Experimental process and results of the effect of light on the life of rat women:

1. The purpose of the experiment is to assume that it is a positive or negative answer to the question, and the hypothesis is that light has an effect on the distribution of rat women, or light has no effect on the distribution of rat women

2. The condition of the control experiment is the only variable of the experiment Because of the "influence of light on the distribution of the rat woman", the only variable in the experiment is light When designing the experiment, the rat woman should be provided with two environments, dark and bright, so that it can be controlled

3. Put 10 rat women in each experimental device, count the number of rat women in bright and dark soil every minute, count 10 times, calculate the average value of 10 statistics, reduce the error caused by chance, and improve the accuracy of the experiment Only 1 rat woman should be used for experiments It is not possible to use 10 rat women, because this can reduce the error caused by the influence of other factors If the collected rat women are sick, or affected by other abiotic factors, and are in a special growth period, the experimental conclusions will be wrong. Therefore, if you put 1 rat woman on each side of the iron plate, you can not draw an accurate conclusion, because the number of 1 rat woman is too small, and the experimental results are accidental

4. It was concluded that light had an effect on the distribution of rat women

5. If "the influence of humidity on the life of the rat woman", then the variable in the experiment is humidity, and the rat woman needs to be provided with two environments: dry and wet

Because the rat woman is suitable for living in a dark environment, light will affect the distribution of the rat woman.

Biological Experiment Report.

1. Ask questions.

In what kind of environment can a rat woman survive? Does light affect the life of a rat woman?

2. Make assumptions.

The rat woman is suitable for living in a dark environment, and the light will affect the life of the rat woman.

3. Conduct experiments.

1. Experimental design: two bright environments, and observe the choice of light and dark environment by the rat woman.

2. Experimental materials: 10 rat women, plastic transparent box, a black cloth, glass plate, sand, chronograph, electric lamp.

3. Experimental device: spread a layer of wet sand in the carton, bounded by the center line of the horizontal axis, cover one side with cardboard, and cover the other side with a glass plate. In this way, two environments, yin and yang, are formed in the box.

4. Experimental procedure: Divide the rat women into 2 groups, 5 on the negative side and 5 on the positive side, and let them stand for 2 minutes. Then, every 1 minute, the number of rat women at different times and in different environments was investigated.

5. Experiment Records:

Environment: 2 points, 3 points, 4 points, 5 points, 6 points, 7 points, 8 points, 9 points, 10 points, 11 points.

Bright 2 2 1 0 0 0 0 0 0 1 1 0.

Shade 8 8 9 10 10 10 10 10 9 9 9 10.

Fourth, the results of the experiment.

Ratwomen are suitable for living in a dark environment, and light will affect the distribution of rat women.

Report on the Influence of Light on the Life of the Rat Woman.

1. Ask questions.

Does light affect the life of a rat woman?

Experimental effects of light on rat women.

Problem: If you turn over the garden, you will often see some small animals with slightly flattened, oblong, gray-brown or black bodies crawling, which are rat women, also known as tide insects. When you move a pot or rock, the rat woman disappears quickly. Why?

Is it because the environment has become brighter?

Ask the question: Does light affect the life of a rat woman?

Make an assumption that the rat woman is suitable for living in a dark environment, and the light will affect the life of the rat woman.

Make a plan:1Materials and utensils: 10 rat women, wet soil, iron plate (or plastic box. cartons), cardboard or glass plates.

2.Experimental device design: cover half of the carton with a cover, and the other half is illuminated by light, so that half of the carton is in a dark place and the other half is in a bright place.

3.Protocol Procedure:

Put the rat woman into the experimental device, and put the same number of rat women on both sides of **, and let it stand for two minutes.

The number of rat women in bright and dark places is counted 10 times every minute.

Implementation plan.

1.Experiment log.

Environment: 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min, 11min

Bright 10 7 9 6 6 8 5 3 1 0

Gloomy 0 3 1 4 4 2 5 7 9 10

2.Experimental Results:

Within ten minutes, all ten rat women had run into the shadows.

Conclusion: Supporting the hypothesis, light has an effect on the life of the rat woman. The rat woman prefers the shade to the light.

Light has an effect on the life of the rat woman.