Interesting facts about the bucculent mollusks presentation. Interesting facts about mollusks. Method of mining

"Mollusk description" - Malacology. Luzhanka. Ammonites. Explain errors from the statement. A variety of mollusks. Characteristic signs mollusks. Classification of mollusks. Squid. Write the numbers of the right statements. Some species have no shell. Methods of movement. Parts of the body of mollusks. Laboratory work. Mollusks.

"Octopus" - it all depends on the temperature of the surrounding water. Octopus breeds twice a year mostly in spring and autumn. Bivalve. Octopuses. The octopus in shallow water dwells to a hundred meters deep, prefers a rocky bottom. The octopus is hunting mainly at dusk and in the evening. Octopus. Intellect of octopuses is much higher than in a number of other vertebrates.

"Class of the Brojonogius Mollusks" - blood vessels. Lung. The string is clearly distinguishable 3 parts of the body. Nervous system. Due to the body asymmetry, there is underdevelopment of the authorities of the right side of the body. Gastropoda Labor Class. Nervous trunks internal organs. Anal hole. Blood vessels develop in the mantle, and the mantle cavity becomes a pulmonary cavity.

"Characteristics of classes of mollusks" - a general characteristic. Types of mollusks. Grape snail. Angelfish. Molluscs. The role of mollusks in ecosystems. CHONE CLASS. Mollusks. Type: Mollusks. Club class. Bivalve class.

"Molluskiy Molluski" - ancient animals that existed 500 million years. Type Icharkin. Almost everyone is protected by a sink formed by the skin fold - mantle. Calculated withdrawal of more than 150 thousand tons. Purpose. Getting acquainted with today's material, you need to fill out data in the table. Felic milk. Table 1. "The value of mollusks".

Total in the subject of 17 presentations

Tasks:

To acquaint students with manifold, organization and the value of the bunthogged mollusks.
Learning to establish causal relations between the characteristics of the structure, livelihoods and the habitat of snails.
Develop the ability to listen carefully, analyze information.
Intensify the cognitive activities of students through independent work on tasks.
Continue to learn children to learn in the drawings, the schemes of the organs, the system of mollusk organs and call them.
Develop a desire to know the animal world.

Equipment:

a computer,
projector,
screen,
separate material of the "Sinks of Labor Mollusks" (one at the desk)
DI. Tritek, S.V. Sudochin. Biology: Animals. 7 CL: studies. For the general form. Institutions. - M.: Mnemozina, 2008
THEM. HFELD. Zoology Grade 7: Workbook, 1997

Lesson plan:

I. Organization and motivation of students' activity.

Verification of knowledge on the topic "The overall characteristic of mollusks":

1. 1-2 student perform a computer test. At this time, the 1-2 student tells at the board the overall characteristic of mollusks (from paragraph 15 of the textbook).

2. Front work on the interactive scheme "Building of mollusk system systems" and a simulator "System of mollusks".

II. Studying a new material.

1. Actualization of the topic, the purpose of the lesson (installation by the teacher of the urgency of the topic and the designation of the problem of the lesson. Writing learning theme lesson and homework. Slides 1-2, presentation).

2. Characteristics Labor clam. (Teacher's story with elements of conversations on the slides: Slide 3 - the number of types of snails; slides 4-12 - the habitat of the snails; slides 13-15 - body structure listed on the slide 16 - the shells of the buncrounds of mollusks). Slide 17 - respiratory organs and food specialization).

Dynamic pause.

3. Building and lifestyle of an ordinary, grape snail and wildlife slim. ( Independent work By options: read and tell the text of the tutorial on page 64-65 about the structure and lifestyle of the Life of Labor Mollusks. Student story. Discussion of the question: What is common in the structure of studied mollusks. Slides 19-20).

4. Sea mollusks: Predatory Snails Cone and Murek, planktonian Pubractor - Marine Angel. (Teacher's story with elements of conversation on slides: 21-23).

5. Communication between the characteristics of the structure, vital activity and the habitat of snails. (Front discussion of the problematic question: What is the relationship between the characteristics of the structure, livelihood and the habitat of the snails. Recording students of the feature of the habitat of the buncelopus of mollusks. Slides 24 - 25.)

6. The value of snails in nature. (Talk conversation. Slide 26.)

7. The value of snails in a person's life. (Story-conversation. Slide 27. Independent work on the task: from the article "Do you know?" On with 45 workbooks you know the answer to the question of what value in the life of a person is mollusks Kauri and Mureks. Slide 28 - 29.)

III. Fixing the material studied (Conversation on questions: Slide 30. Performance of the test followed by self-examination: slides 31-32).

IV. The result of the lesson, evaluation for the lesson.

Labor, or snails, is the richest class of mollusks of species. Most bucculent marine animals. Some representatives of this class during evolution adapted to life in fresh reservoirsOthers moved to ground existence. In the seas, the bunthrodium are found at various depths, on land in various climatic conditions. They are hardy to high and low temperatures, partly due to the ability to fall into the hibernation: in the north in winter, in the south in summer and often in winter.

The shape of the body of the buncelopus is diverse. The head is clearly isolated from the body, 12 pairs of supreets and a couple of eyes bears. The foot is well developed and usually has a wide clad sole. The torso forms the growing in the form of a large intrinsic bag. Feature All buchelogium asymmetry of the structure arising from the formation of a spiral-twisted shell. Dimensions of buchelichi range from 23mm to several centimeters (grape snail, slug, pondovik

The mouth of the mollusks leads to the oral cavity, moving into a muscular pharynx, in which the language with the Radule is located. In addition, in the oral cavity there are local thickening of the cuticle (the so-called jaws). In the thumb open with one pair salivary glands. The throat goes into the esophagus, some at its end is formed expansion - goiter. The middle intestine has an extension - the stomach, followed by a small intestine, turning into the rear, ending poroshires. Some lower buchetic revenues passes through the ventricle of the heart. The liver allocates secrets contributing to digestion of food (mainly carbohydrates), and the liver is capable of sucking food and glycogen and fats are deposited in it.

The bunthogged mollusks in most have one left atrium (the right reducing sometimes completely) and one ventricle. The heart of mollusks is surrounded by pericardium. Aorta is moving away from the ventricle, which is soon divided into a head aorta and an internal aorta (goes to the intestines, liver and gender). From the branching of the arteries, blood gets into the lacuna, loses oxygen and is going to venous lacuna, hence the blood returns to the gills or light and, oxidized, falls directly in the heart.

The nervous system of animals consists of several pairs of ganglia, associated with the Comisors. The buchetic eyes are eating, the equilibrium authorities are stampeted, tanging (tentacles) and chemical feelings. The separation system of mollusks consists of a cup of everything from one left kidney, one end communicating with the pericardium, and by another side of the mantle cavity on the side of the poroshires.

Among the brickelogs there are separate animals and hermaphrodites (snail). They always have one, the fertilization is always cross, and the hermaphrodite has each individual and as a male, and as a female. Fertilization in most animals is internal. In pulmonary mollusks - the development is direct and proceeds to the end in the egg shell, in the rest - with the formation of the larvae (three phophores or sailboat).

The economic importance of the buncelopus is small. Slug and grape snails in agriculture pests. But grape snails in some countries, especially in France, are considered a delicacy and specifically bred. Many large sea snails (trumpeters) are in food. Sinking sinks with a well-developed pearlescent layer are used to make decorations.

In antiquity, Kauri's special shells in southern countries served a broken coin. A number of types of buchelogs are the first intermediate hosts of parasitic flat worms, dangerous and for humans. Two kind of tropical mollusks cone and Terebra have poisonous glands and can seriously "worry" with a careless person.

Theme lesson: Brojonogi mollusks .

(snails)

The purpose of the lesson:

Get acquainted with the systematics of mollusks and their meaning.
Show complication of the level of the organization of mollusks compared to ringed worms.
Remove the features of the structure, vital activity and the origin of mollusks.
Continue the formation of skills to analyze; establish causal relationships.

Prudovik

Coil horny

Ground mollusks

Grape snail

Yancar

Sea mollusks

kauri

miter

Cone

Mureks

Signs for comparison

Poultry

Habitat

Bivalve

Sink

Poglogo

Body division to departments

Motion authorities. Way to travel.

Lifestyle.

View of food.

Method of mining.

Breath

Most snails are formed openPiral shells when all its turns are visible outside

Some snails have a latter curl of all previous curls. Such sinks are called hiddospirals

Kauri (English Cowry) - Tropical clam shells used as money on Oceania Islands. Kauri - sea bubble-legged mollusk of the Cypraeidae family. Peoples inhabiting coastal regions are familiar with them for several thousand years. It is known that Kauri's sinks were used as money in China, India, in the Arabian Peninsula and Africa. They believed that they were protected from evil, and therefore Kauri's sinks, their clay models were invested in the walls of buildings and in the graves. Tiger Kauri is perhaps the most famous among other species. Big sizes, a shiny surface and a large spot on the sink, it attracts even a random observer. Kauri - predators that eat soft beings living on the rocks. The foot almost completely wraps the sink, when the mollusk moves, and the siphon sticks out in front, like a small periscope. Female Kauri lay eggs into small capsules, attaching them clusters to stones. They guard these capsules, covering them with their foot until the offspring hatch.

Muries

Muries, or bugres one of the most popular groups of group collectors. The sinks of these snails are decorated with numerous growing, ridges or spikes and brightly painted. Many Murgers reach impressive sizes. Representatives of the family are distributed throughout the World Ocean from the polar latitudes to the equator, but the most bright and large species inhabit tropical zone. Muries - carnivorous snails. Their victims are bivalve mollusks whose sash they are drilled with their Radules.

Cone - Predatory snail, with a poisonous. They hunt with the help of the tooth - pierce them with the victim as harpoon. Feed on with sea worms, molluscs and small fish .. May be so horrid no worse than bee - and the consequences can be quite unpleasant. Even fatal outcome is possible. There are about 600 types of cones. They are concentrated in the tropical seas and oceans around the world. Most of the cones live on or near coral reefs. His name snail received the shape of the shell in the form of a bullet. In many of the cones, the surface of the shell is brightly painted. Of course, the sink is hard, and the "foot" at the snail is only alone, so these animals move extremely slowly. What forces them to stop fast-lived prey with the help of a poisonous harpoon. This harpoon is a modified tooth. In general, the teeth (in the snails they are called Radules), are needed in order to better sort and digest food. Each tooth is in the rear wall of the oral cavity. Snail paralyzes the sacrifice, the Radules retract it, dislike. And the inconvenient material, including one-time harpoon, remaining in the sacrifice body, the snail is spewing back. The harpoon becomes another tooth. The snails they grow constantly.