1, preparation materials: choose a suitable container, such as a large fish tank or a glass jar; Prepare some soil and sand and stir with clear water; Choose suitable animals and plants, such as Ceratophyllum, small fish, etc. At the same time, prepare a light source or lamp to ensure the light needed for plant growth.

2. Place plants: put plants such as Ceratophyllum into a container so that their roots grow to the bottom of the container. Place the animals: put the small fish in a container next to the plants. Place soil and water: mix soil and water and put them into a container, so that the soil will settle at the bottom of the container and the water will cover the soil.

3. Maintenance and management: put the container in an appropriate place, such as a place with sufficient light or under light, and add water regularly to keep moisture. At the same time, pay attention to the biological growth in the container and adjust the management in time.

4. Eco-bottle is a device to simulate natural ecosystem. It consists of a closed glass or plastic container, which contains various biological and abiotic elements, such as water, soil, plants and animals, as well as certain space and time conditions.

Concept and related knowledge of biological operation

1. Biology homework is an important part of biology teaching, which refers to the biological practice tasks that students complete independently or in groups after class according to the requirements of teachers. This kind of exercise usually appears in the form of answering questions, requiring students to review, sort out, understand and apply the biological knowledge they have learned.

2. The main purpose of biological homework is to consolidate and deepen students' understanding of biological knowledge and improve their ability to think and solve problems independently. In addition, biology homework can also help students to be familiar with all aspects of biological experiments, practice and research, and enhance their biological experiment skills and operational ability.

3. There are various types of biological homework, such as written homework, family experiments, field surveys and small papers. Written homework refers to some written exercises completed by students after class, such as multiple-choice questions, fill-in-the-blank questions and short-answer questions. Family experiment refers to the experimental tasks that students complete at home, such as observing plant growth and cultivating microorganisms.

4. Field investigation refers to students' field investigation and observation in the field, such as observing animal and plant ecology and soil environment. Small thesis means that students make in-depth research on a biological problem through consulting materials and experimental research, and write a small thesis according to the requirements of teachers.