"An aquarium is a small artificial ecosystem." Aquarium - artificial ecosystem at home (design work) 18 aquarium small artificial ecosystem

1. Write what non-living parts of the ecosystem and “professions” of living organisms we find in the aquarium.

1 - soil - rocks, 2 - water, 3 - plants - producers, 4 - crustaceans - consumers, 5 - fish - consumers, 6 - snails - destroyers, 7 - microbes - destroyers.

2. Fill out the table.

3. Make an outline of the text from the textbook.

Aquarium plants. Fish. Shellfish. Crayfish and turtles.

4. Look at the pictures. Think about why you can’t keep fish this way. Correct their living conditions using colored pencils. What are the rules of an aquarist?

1) There must be water in the aquarium. We need to finish drawing the plants. There are too many fish in the aquarium.

2) The aquarium must be inaccessible to other pets.

5. Determine in which parts of the world the homeland of aquarium fish is located. Write the names of the fish.

Testing your ability to understand text

Read the text "Aquarium - a small artificial ecosystem" on pages 75-77 of the textbook. Complete the tasks.

A. We learn to understand the text and find facts.

1. What is the text mainly about? Choose only one answer and mark it.

To the inhabitants of the aquarium.

2. Choose from the sentences below the one that tells you what role catfish play in the aquarium. Tag him.

Catfish are real “scavengers”: they swim near the bottom and clean the aquarium of food debris.

3. Which aquarium fish breathe atmospheric air? Choose only one answer and mark it.

4. Write what animals are kept in aquariums.

Fish, crayfish, turtles, snails.

5. Write in which country the goldfish was bred from crucian carp.

6. Which of the pictures depicted is spoken of in the text? Circle them.

B. We learn to understand the text, compare information and draw conclusions.

7. Why are goldfish kept in colder water? Choose only one answer and mark it.

Because they come from temperate climates.

8. Why do they put spool snails in an aquarium? Choose only one answer and mark it.

They clean algae off the glass.

9. Why in this text, of all the inhabitants of the aquarium ecosystem, are mainly described fish?

A person buys an aquarium to breed fish, so he must have information about them.

10. Write why goldfish are not kept together with guppies and swordtails. Choose only one answer and mark it.

They prefer colder water.

11. Write why crayfish and turtles are not kept together with fish.

Crayfish and turtles eat fish and gnaw plants.

12. Write why not all plants in aquariums are correctly called algae.

Because Flowering plants can also grow in aquariums.

We learn to understand the main idea of the text.

To start an aquarium, you need to know about its inhabitants.

14. If the text had one more paragraph, what would it talk about?

About the nutrition of fish or about the devices that are needed to care for the inhabitants of the aquarium.

15. Which of the headings best suits the entire text? Choose only one answer and mark it.

Who inhabits the aquarium?

16. Which sentence best helps you understand the main idea of the text? Choose only one answer and mark it.

If you seriously want to make your own small artificial ecosystem, then find a book about aquariums and read it carefully.

Lesson of the surrounding world in 3rd grade using multimedia.

Topic: Aquarium - a small artificial ecosystem.

Objectives: - to introduce students to the components of the ecosystem using the example of an aquarium; with the inhabitants of the aquarium; teach how to maintain the aquarium ecosystem.

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Lesson of the surrounding world in 3rd grade using multimedia.

Sakhnova Nadezhda Vasilievna, primary school teacher.

Topic: Aquarium - a small artificial ecosystem.

Objectives: - to introduce students to the components of the ecosystem using the example of an aquarium; with the inhabitants of the aquarium; teach how to maintain the aquarium ecosystem;

Promote the formation of an emotionally positive attitude towards the learning process;

Form a positive emotional attitude towards high-tech equipment, including multimedia;

Contribute to the formation of an innovative and active consciousness;

Equipment: PC, multimedia projector, Microsoft Power Point presentation, aquarium, illustrations of aquarium fish and plants, individual task cards, test, books about the inhabitants of the aquarium.

During the classes.

Organizing time.

Hello guys! I'm glad to see you all. Please turn to the guests, smile at them, say hello. Smile at me, and I at you. Sit down. Dear guys, dear guests! May this lesson bring us the joy of communication and fill our souls with wonderful feelings.

2.Introduction to the topic and objectives of the lesson.

Guys, what are we going to talk about today in the lesson about the world around us?

Look through these slides and try to formulate the topic and purpose of the lesson yourself.

(presentation: 9 slides about aquarium music)

So, the topic of our lesson (children's answers) is click. Click slide “Aquarium is a small artificial eco-system.”

Today in the lesson we will get acquainted with another artificial ecosystem, small compared to the ecosystem of the field, the ecosystem of the aquarium.

3. Updating knowledge.

Test.

What is an ecosystem? Let's test our knowledge and take a test.

Take the cards. Read the answers. Find the correct answer and mark it with a tick.

We work in pairs. Swap jobs, help each other. Reads the answer_____

(slide – checking the completion of the test using the key. Raise your hand if you completed the test correctly).

2. Blitz survey.

What ecosystems have we met?

(swamp, lake, meadow, forest, field).

What parts does an ecosystem consist of?

What “professions” of living organisms are necessary for the cycle in the ecosystem to be closed?

Why can one ecosystem gradually change into another ecosystem over time?

What is an artificial ecosystem? Give an example.

3. Statement of a problematic question.

Is it easy to create an artificial ecosystem? What is needed for this?

4.Working with the textbook p.72.Reading the dialogue.

Our regular heroes Lena and Misha tried to create an artificial ecosystem, but they ran into problems. Help them resolve these problems. Read what didn't work for them?

5. Reading the dialogue. Misha_______, Lena______________

Questions after reading:

What ecosystem did Misha and Lena create?

Aquarium.

What is it - natural or artificial? Why?

Artificial because man created it.

Why is it difficult for the fish to breathe in Lena and Misha’s aquarium?

There are no algae producers. They saturate the water with oxygen.

4 .Joint discovery of new knowledge. Explanation of new material.

1.Complete task No. 2.

Look at the picture in the textbook and on the screen and name the components of the ecosystem: label the non-living parts of the aquarium ecosystem and the “professions” of living organisms.

2.Complete task No. 3.

Why should an aquarium contain organisms of different professions?

Let's fill out the table.

What do producers give to other organisms, and what do they get?

What do consumers give and what do they get?

What do destroyers give and what do they get?

Let's draw a conclusion.

5. Physical education for a minute.

The sea is agitated once

The sea is worried two

The sea is worried three,

Ships are sinking in the water.

Mermaids swim on the waves,

They dance, spin and sing.

And the seagulls flap their wings over those blue waves.

6. Defense of the project “Aquarium-small artificial ecosystem”.

All week the children were exploring living organisms in the aquarium. To do this, they were divided into 4 groups. 1 group studied plants, 2 group - aquarium animals, 3 group - scavengers, 4 group - objects of inanimate nature. We called them historians - aquarists. The children visited a pet store, a library, interviewed an experienced aquarist, read an encyclopedia, and the Internet. This is what they did.

1. The explanatory dictionary of S. I. Ozhegov says: aquariumis an artificial reservoir or glass container with water for keeping fish, aquatic plants and animals.

The first aquarium appeared in China in the second half of the fourteenth century. It was made of porcelain in the form of a huge vat and very soon became widespread in the palaces of the nobility. It was in China that various types of goldfish were bred from common crucian carp. In Russia, aquarium farming began to develop from the end of the nineteenth century.

The aquarium begins with preparing the soil. For this purpose, washed, coarse-grained sand or pebbles (layer 4-6 cm) are specially selected. You should not put shells on the bottom of the aquarium, as they make the water hard. Tap water for the aquarium is left to stand for 5-7 days. Then water is poured into a special glass container and soil is laid.

2. After a couple of days, aquatic plants are planted in the aquarium.They form the basis of the created ecosystem, providing oxygen production, carbon absorption and the creation of organic substances necessary for fish nutrition. Plants also serve decorative purposes. All aquarium plants are often incorrectly called algae. In fact, flowering plants with beautiful leaves are placed in the aquarium.

(slide click yellow egg capsule, click riccia (water moss), click

hornwort, ludwig's click).

3.The most common inhabitants of an aquarium are fish.Fish are warm-water and cold-water. In a warm-water aquarium they contain American fish: guppies, barbs, swordtails. Look at them.

(slide click barbs, click guppy, click angelfish, click piranha, click parrots, click catfish).

4. Catfish are real “scavengers”.They swim on the bottom and clean the aquarium of food debris. It turns out that catfish are just like you and me. breathe the air of the atmosphere. To do this, they occasionally stick out of the water.

5.Turtle. Turtles are kept much less often in aquariums. After all, they eat fish and often gnaw plants. Therefore, it is better to plant them in a separate aquarium.

(Showing children living turtles).

6.What do they feed the fish?

(Cyclops, daphnia, food display)

Name reasonable rules for feeding fish.

(Children with drawings come out and say the rules).

Do not overfeed the fish. Feed little by little, but often.

Change the water 1-2 times a week.

Keep warm-water fish separate from cold-water ones, and predatory ones from non-predatory ones.

Aquarium house for fish.

7. Final reflection.

Conversation.

Who has a desire to have an aquarium at home?

Who has an aquarium with its inhabitants?

What advice could you give to other guys who want to have an aquarium?

We now have our own aquarium in our class. Let's check, what about our aquarium ecosystem? Prove it.

What ecosystem? Is the cycle of substances in our aquarium closed or not? Why? So, the life of the fish depends on whom?

(slide click “We are responsible for those we have tamed” by A. Saint-Exupéry)

How do you understand these words?

If it is difficult to create a small artificial ecosystem, and even more difficult to maintain, why does a person need an aquarium?

What does aquarium knowledge give a person?

(Give a boost of energy and vigor. Relieves stress, reduces blood pressure, fatigue).

Raise your hand, who received a charge of vivacity, the joy of communication, the joy of knowledge?

8.Relaxation.
- The world of the aquarium is rich and diverse. Enjoy it some more.

(presentation accompanied by music, slide show about the inhabitants of the aquarium).

Have we learned everything about the aquarium?

Where do we get knowledge?

(Book exhibition.)

9.Homework.

One summer, Lena scooped up a whole jar of water from the lake, planted crucian carp in it and began to observe. The water had to be changed every day, otherwise it would become cloudy and the fish could not breathe. Lena did not understand why her small aquarium required constant attention, and she asked Misha about it.

The brother reminded Lena that aquarium— it is a small artificial ecosystem. An ecosystem is stable only if the laws of nature apply in it. Misha advised Lena to remember everything she knows about ecosystems.

Let's try to follow the role of various aquarium inhabitants in the cycle of substances.

Green plants(“breadwinners”) produce organic food and oxygen from simple substances in the light for themselves and for all the inhabitants of the aquarium. Small crustaceans(daphnia and cyclops), mollusks and fish use oxygen (dissolved in water) for respiration and release carbon dioxide, which is again absorbed by plants.

But making an aquarium a real ecological system—one that could exist without human intervention—is very difficult. To do this, plants and animals in the aquarium must be selected competently.

Let's get acquainted with the ordinary inhabitants of aquariums. All aquarium plants are often misnamed algae. In fact, in addition to algae, some flowering plants with beautiful leaves. They bloom very rarely, but live in the aquarium for a long time.

The most common inhabitants of aquariums are: fish. Get to know the main types of aquarium fish. Most of them come from the tropics, so the water in the aquarium should be warm - from 20 to 27 ° C. Most Popular guppy And swordtails, as they are very unpretentious and easy to maintain.

Of course, not all fish kept in an aquarium come from the tropics. Once upon a time in China from goldfish, a relative of our crucian carp, was taken out goldfish. Because the crucian carp They live in a temperate climate; goldfish are kept in colder water compared to tropical ones. Material from the site

In addition to fish, others are sometimes placed in the aquarium animals: shellfish, crayfish, turtles. The most common of them are the inhabitants of the aquarium - shellfish coils. Larger ones are less common snails — ampularia.

Very often, the illuminated glass of aquariums becomes overgrown with green mud- tiny algae. They release life-giving oxygen, but block the light. They come to the rescue coil snails, which clean algae from glass.

Rakov And turtles can be seen in aquariums much less often. After all, they are predators and eat fish, often gnaw and tear out plants. Therefore, it is better to keep crayfish and turtles separately from fish.

If you seriously want to have your own small artificial eco-system at home, first follow good advice. Find a book about aquariums and read it carefully. Then your underwater world will be truly stable and will delight you for a long time.

On this page there is material on the following topics:

Conclusion about the sustainability of an artificial ecosystem (aquarium)
An aquarium is an artificial ecosystem. inhabitants of the aquarium why did you choose this topic?
Laboratory work aquarium ecosystem
What is an aquarium ecosystem
Report of fish in an aquarium

Questions about this material:

Municipal educational institution "Gymnasium No. 23"

Lesson about the world around us.

An aquarium is a small artificial ecosystem.

Case lesson

Primary school teacher Strokova O.A.

Class: 3

Program: OS "School 2100".

Lesson 19.

ChapterIII . ECOLOGICAL SYSTEM

Tema: An aquarium is a small artificial ecosystem

Goals:

– Reinforce knowledge about the components of an ecosystem using the example of an aquarium ecosystem.

– Introduce students to the inhabitants of the aquarium.

– Learn how to maintain an aquarium ecosystem.

Equipment: illustrations of aquarium fish and plants, cases with information,

Lesson steps

During the classes

Formation of UUD

and technology for assessing educational success

Ι. Updating knowledge and setting educational problems.

1 3

– Look at the picture and read Lena’s question from the dialogue on p. 74.

Why is it difficult for the fish to breathe in Lena’s aquarium?

(Lena forgot to place plants in the aquarium. They release oxygen, and then the inhabitants of the aquarium will have something to breathe).

– Is an aquarium an ecosystem?

They remember everything they know about the ecosystem.

– Let's make a lesson plan.

A plan is drawn up based on the opinions expressed by the children.

– What were we doing now? (We were planning our activities.)

Cognitive UUD

1. We develop ability to extract information from diagrams, illustrations, texts.

2. Present information in diagram form.

3. Reveal the essence and features of objects.

4. Draw conclusions based on the analysis of objects.

5. Summarize and classify according to characteristics.

6. Focus on the spread of the textbook.

7. Find answers to questions in the illustration.

ΙΙ. Collaborative discovery of knowledge.

Working with cases.

Work in the textbook. Working in a workbook.

– Look at the picture on p. 74 and answer the question for him. Write your answers in your workbook, in task 1 on p. 35.

Indicate the parts of the “aquarium” ecosystem.

Questions for the student who did the work (the beginning of the formation of a self-assessment algorithm):

– What did you need to do?

– Did you manage to complete the task?

– Did you do everything right or were there any mistakes?

– Did you compose everything yourself or with someone's help?

– What was the task level?

–

– Now together with ... (student’s name) we were learning to evaluate our work.

– Let's get to know the inhabitants of the aquarium better. To do this you need to work in groups. We will be divided into 3 groups, because... We face three main questions:

Group 1 – Botanists. Students will learn what plants grow in aquariums and what role they play in this ecosystem.

Group 2 – Ichthyologists (scientists studying fish). They will tell you what fish live in aquariums and the peculiarities of their maintenance.

Group 3 – Zoologists. They will tell you what other animals live in aquariums.

You have several sources of information on your desks. After studying the sources (15 minutes are given for studying), you will have to compose a short speech and tell the most important things about your topic.

Case No. 1.

Source 1

Textbook by A.A. Vakhrushev, D.D. Danilov. The world. 3rd grade. Part 1. Publishing house "BALASS", Moscow, 2013. Pp. 75

Source 2.

Decorative role of aquarium plants

Aquarium plants- a necessary element of any aquarium. If you decorate your aquarium beautifully and tastefully with plants, they will become a real decoration. The appearance of the aquarium is determined by the plants. Lush thickets aquatic plants, located in the water column, create new specific possibilities for spatial arrangement, inherent only in the water element. By changing the direction and intensity of light sources, you can force plants to change the color of their leaves and their orientation in accordance with the composition you have in mind. Optimal selection of aquarium plants allows you to create a beautiful underwater landscape without excessive maintenance efforts and additional costs.

Source 3.

Biological role of aquarium plants

Aquarium plants perform not only a decorative role. They establish the biological balance of the aquatic environment, enrich the water with oxygen, and play an important role in the metabolism necessary for the life of fish and plants themselves.

For the amount of oxygen entering the water, the total surface of aquatic plants is decisive; it is not broad-leaved plants that have a larger surface, but, on the contrary, plants with many thin, feathery leaves - such as cabomba, yarrow, egeria, Javan and Indian water ferns.

Another important task performed by aquarium plants is water purification. Unlike many land plants, water dwellers have the ability to absorb minerals not only through their roots, but also through special pores on their leaves.

Some plants reduce water hardness and absorb calcium, acting as a kind of filter. Thus aquarium plants play an important role in maintaining biological balance in the aquatic environment of an aquarium.

Source 4.

The importance of plants for aquarium fish

Many species of fish simply need plants during the spawning period, as they lay their eggs on the leaves of plants or in safe dense thickets. Some plant elements are used to build the nest. After spawning, floating algae serve as a refuge for the fry.

For herbivorous fish, algae is the main food, and for omnivorous fish it is a vitamin supplement in the diet. Plants, bringing the aquarium closer to a more natural habitat, encourage fish to more fully express their behavioral characteristics.

Source 5.

Poster “Aquarium Ecosystem” from the set “Visual materials on the surrounding world for 3rd grade.”

Case No. 2.

Source 1

Textbook by A.A. Vakhrushev, D.D. Danilov. The world. 3rd grade. Part 1. Publishing house "BALASS", Moscow, 2013. Pp. 75- 76

Source 2.

Having decided to have one or another type of aquarium fish, first of all, it is important to familiarize yourself with the conditions of their habitat in their natural environment, since the choice of the shape and size of the glass tank intended to contain them will depend on this. For example, and mollies are demanding for the presence of a large amount of oxygen dissolved in water, and therefore they need big size. For For viviparous fish, a medium-sized tank is suitable. But for catfish and labyrinthine fish species that are able to breathe oxygen from the atmosphere, their habitat in natural conditions is the bottom layers of reservoirs, so for them the size of the aquarium is not significant.

Ornamental fish were able not only to adapt to existence in an artificial environment, but were also able to maintain high reproductive capacity. Nevertheless, despite this, the aquarist needs to make efforts to, if possible, recreate conditions that are as close to natural as possible and, moreover, suitable for a specific breed of fish. Imitating various features characteristic of the fish’s native habitats will help achieve excellent results. It is also worth paying attention to the quality of food, since a balanced and varied diet can have a good effect on the size and color inherent in a particular type of fish.

An important factor for the successful keeping and breeding of aquarium fish is their compatibility with each other. Firstly, special attention must be paid to the size of the fish. There is no need to place small and large breeds in the same aquarium, as this can lead to complete or partial extermination of small individuals. Secondly, fish, which by nature are predators, should not be kept with other species; in addition, their aggression can spread to other inhabitants of the aquarium, for example, snails. Thirdly, it is important to take into account the temperament of the fish, since an attempt to combine nimble and active ones with calm and slow ones can lead to undesirable consequences.

Source 3.

Fish, like all other animals, need food to live, grow and reproduce. Food provides the energy necessary to support metabolic processes in fish, and, in addition, contains everything that is required for the growth and development of tissues.

Proper feeding of fish is one of the most important aspects in an aquarium. Improper feeding is, along with poor water quality (which is also caused, for example, by overfeeding) the main cause of fish death.

The main categories of nutrients required by fish are proteins, lipids (fats) and carbohydrates, as well as some certain minerals and biochemicals - particularly vitamins. Fish differ from other vertebrates in the relative amounts of nutrients they require. In particular, many groups of fish, especially carnivores, can digest a higher percentage of dietary proteins (from 35 to 55%) than birds and mammals, which can digest up to 25% of proteins.

There is also some difference in the amount of food consumed by fish compared to other animals. In addition, fish of different species also differ from each other in terms of nutrition.

In order to properly feed fish in captivity, it is important to know how they feed in natural conditions and what feeding habits fish of each specific species have.

Source 4.

Some of the most recommended for beginner aquarists and beyond are aquarium fish guppy. And not only because they are small (which means they eat less) and beautiful, but first of all because they are absolutely not demanding in terms of living conditions. So!

The northern part of South America, as well as the islands of Trinidad and Barbados, are considered the homeland of these cute creatures.

Guppy fish belong to the Poeciliidae family. Currently classify guppy incredibly difficult (yes, almost impossible), since, thanks to selection, more and more new species are born every year. But, nevertheless, the basis for classification is the body color of the males, as well as the shape, size and color of the fins.

The male aquarium guppy fish is always much smaller than the female: the “height” of the male barely reaches three centimeters, while the female has a “height” of 6 and sometimes 7 centimeters. In principle, the difference in size is the main visual difference when determining the sex of guppies. But there are other signs: the male’s body is slender, elongated, flattened on the sides and resembles a bullet. In females, in principle, everything is the same, with the exception of a more flattened rear part of the body.

The color of the male is very bright and rich. In addition to the stunning color, males have truly gorgeous fins: both dorsal and caudal! The anal fin of the male is transformed into a reproductive organ called the gonopodium.

But the females are deprived of Mother Nature: they have nothing outstanding except “growth.”

By the way, any novice aquarist should take into account the fact that guppies are schooling fish. Therefore, I strongly recommend keeping at least 8-10 of them in one aquarium.

I would like to add this point: never put other types of fish in an aquarium with guppies. I know, I know, now someone will say: they say that they are peaceful and get along with those who are also peaceful, etc., etc. It’s true, guppy fish are extremely peaceful, but their fins are very luxurious and many species of peaceful aquarium inhabitants (,) love to chew off these fins. So, if you don’t want to have an aquarium full of “ragamuffins,” let your guppies live on their own: believe me, they won’t be bored!

Source 5.

Poster “Aquarium Ecosystem” from the set “Visual materials on the surrounding world for 3rd grade.”

Case No. 3.

Source 1

Textbook by A.A. Vakhrushev, D.D. Danilov. The world. 3rd grade. Part 1. Publishing house "BALASS", Moscow, 2013. Pp. 77

Source 2.

Do you want to change the world of your aquarium a little? Freshwater shrimp will help you with this! So let's talk about it.

If you have peaceful fish in your aquarium, then shrimp are the best neighbors for them!

But shrimp is different from shrimp! Only very small species of freshwater shrimp can be selected for the aquarium, such as neocaridina shrimp, cherry shrimp, black crystal shrimp, amano or bee shrimp. All of the shrimp listed are small in size - from 2 to 5 centimeters.

Take the neocaridina shrimp for example.

This is perhaps the most unpretentious shrimp from the world of crustaceans. Neocaridina is perfect , since it does not require any special conditions for its maintenance. Neocaridina feeds on tubifex and the remains of live and dry food, which sinks to the bottom of the aquarium.

The best soil for neocaridina is river pebbles and a little sand. The crustacean is not aggressive towards the fish with which it will live in the same aquarium. Quite the opposite: you shouldn’t put neocaridina in an aquarium with large aggressive fish!

The water temperature for the shrimp does not play a special role; it feels great at both +19 and +26*C. however, you should not allow sudden temperature changes: shrimp get sick too! Favorite habitats for shrimp are grottoes, empty shells or cavities in rocks. So take care of this: place a couple of small empty shells on the bottom of the aquarium. There are also precautions when it comes to shrimp. During the breeding season, aquarium fish can easily eat shrimp eggs. Therefore, I advise you to take care in advance of a separate aquarium in which you will breed neocaridina. Regarding the number of shrimp in the aquarium, I will say this: too many is bad! In general, “crush” in an aquarium does not lead to anything good. Therefore, it is enough to keep only 4-5 shrimp in an aquarium with a volume of 50 liters.

Source 3.

Source 4.

Ampularia
This is the name of a genus of large freshwater snails that live in the tropical zone of Asia and South America. These snails breathe both atmospheric oxygen and oxygen dissolved in water. They have both gills and lungs, so the snail can live out of water for a long time. The 2 eye antennae are very long, the eyes are located on stalks at their base. There is a very long breathing tube.
Ampularia lays eggs in the form of clusters on the walls of the aquarium protruding from the water. The eggs have a grayish tint. Young snails hatch approximately 2 weeks after the eggs are laid. The caviar must be protected from drying out, making sure that the lamp is not too close. Young snails can be fed with cyclops, finely chopped plants such as riccia and duckweed. Adults are omnivores.
Ampularia is undemanding to the characteristics of water, but likes to be warm. The suitable temperature for it is 22-30 °C. You need to make sure that the snails in the aquarium have enough food, otherwise they will take on aquatic plants. You can feed them with bread crumbs, lettuce leaves, and meat.
If you keep an ampoule, you must close the top well.
The most popular types of ampullaria among aquarists are australis, giant and golden (a type of giant ampullaria)

"Coil"
The Horn Coil (Planorbarius corneus) is found almost everywhere in rivers, ponds and lakes. It is very easy to distinguish a coil by the characteristic appearance of the shell, which is twisted in a spiral in one plane. The color of the shell can range from dark brown, almost black, to red. The diameter of the shell of the horny coil in nature reaches 3 cm. In aquariums, these snails are usually much smaller.
The reels are extremely durable and can survive even in very dirty water. This is possible due to the fact that they can breathe both atmospheric air, taking it into the pulmonary cavity formed by the walls of the mantle, and oxygen extracted from water. They do not have real gills, but there is a thin protrusion of the mantle, which in its function replaces the gill. Moreover, the coils resort to pulmonary breathing only when there is little oxygen in the water.
Coils, like other snails, move with the help of their legs, and orient themselves through a pair of tentacles located on the head and eyes, which are located at the base of the tentacles. These snails can also move along the surface of a reservoir, attaching themselves to the surface tension film of the water.

Source 5.

Poster “Aquarium Ecosystem” from the set “Visual materials on the surrounding world for 3rd grade.”

Presentation of speeches.

Now that the speeches have been completed, I ask for one representative from each group. These guys will speak at the conference, and the rest will try to imagine themselves as alien guests who are not familiar with the substance being presented. And at the end of each speech, you can ask questions to the earthlings.

Questions for the group:

– What did you need to do?

– Did you manage to complete the task?

– What was the task level?

– What skills were developed during this task?

– How can we answer the lesson question?

(An aquarium is an artificial ecosystem in which there are organisms of different “professions”, a closed cycle, but the existence of the ecosystem is supported by humans.)

– What were we doing now?

– What skills did you develop? (cognitive, communicative)

Communicative UUD

1. We develop the ability to listen and understand others.

2. Construct a speech utterance in accordance with the assigned tasks.

3. Express your thoughts orally.

4. Ability to work in pairs and groups.

Personal results

1. We develop the ability to express our attitude towards heroes,

express your emotions.

2. Evaluate actions in accordance with a specific situation.

3. Forming motivation for learning and purposeful cognitive activity.

ΙΙΙ. Independent application of knowledge.

1. Work in the textbook.

Organization and execution of work:

Students complete assignments 1–17 in writing. The order of completing tasks is arbitrary. Children need to be explained that it is better to complete tasks sequentially, but in case of difficulty, they need to move on and return to the missed task again. The result is influenced by how many tasks are completed and the quality of their completion.

Test work plan.

№ tasks

Task group

Difficulty level

Form

Points

necessary

multiple choice

Learning to understand text and find facts

necessary

multiple choice

Learning to understand text and find facts

necessary

multiple choice

Learning to understand text and find facts

necessary

with a short answer

Learning to understand text and find facts

elevated

with a short answer

Learning to understand text and find facts

elevated

multiple choice

necessary

multiple choice