1. Let's continue filling out the table.
2. Let us explain the above statement.
Annelids for the first time have a secondary body cavity and the cellular structure of the skin. A circulatory system appears in the internal structure. The excretory system is represented by more developed metanephridia. Most ringlets are free-living, some have something like legs - parapodia. Everyone has bilateral symmetry. There are sense organs.
3. Let's write about the protective function of partitions.
Each segment of annelids is separated by a septum and has a full set of nerve ganglia, nephridia, annular vessels and gonads. If the integrity of one segment is violated, this affects the life of the worm to a small extent.
4. Let us list the structural features of the rings.
Some types of ringbills have parapodia and setae for locomotion. Those species that do not have parapodia have bristles or their body is covered with mucus for better gliding. The muscular system of all rings is represented by circular and longitudinal muscles.
5. Let's finish the diagrams.
a) Digestive system of ringlets
b) Nervous system of ringlets
c) Sense organs of rings
6. Let's write about the division of the ring body.
Regeneration may occur and the worm will restore the lost parts. That is, asexual reproduction will occur.
7. Let's write an answer about the formation of the belt.
Maybe. In some polychaete worms living in the seas and belonging to the phylum Annelids, reproduction occurs in water, fertilization is external. But in most ringlets, reproduction occurs with the help of a belt.
8. Let's explain the relationship.
There is a direct relationship between the number of eggs laid and care for the offspring. Some polychaetes lay a few eggs, and the female guards them. This means that Annelids are more advanced than previous types of worms.
9. Let us list the feeding methods of polychaetes.
Among polychaete worms there are predators that feed on small marine animals. There are omnivores that filter water and eat plants.
10. Let's finish the sentences.
The development of polychaetes occurs with alternation of life forms. Their larvae do not resemble adults. Each life form performs different functions: reproduction, dispersal, self-preservation. Some polychaetes are observed caring for offspring.
11. Let's finish the diagram.
The meaning of polychaetes in nature
1. Filter the water.
2. They are fish food.
3. They feed on the remains of dead animals.
12. Let’s write down the differences in the nutrition of different worms.
Oligochaete worms feed on organic matter from plant remains of the soil, and among polychaetes there are also predators, omnivores, and herbivores.
13. Let’s write down the common adaptations of protozoa and oligochaetes.
To withstand unfavorable conditions, many protozoa form a cyst, and oligochaetes form a protective capsule, and enter diapause. These formations are similar in their functions.
14. Let us indicate in the figure the structure of an earthworm. Let's draw a conclusion.
Conclusion: The primary body cavity is supporting. It contains a liquid that gives the worm's body elasticity.
15. Let us list the features of leeches.
1) Constant number of body segments (33)
2) The presence of suction cups for attachment to the victim’s body or substrate.
3) Lack of bristles on the body.
4) All leeches live in an aquatic environment.
16. Let's name the types of food of leeches.
17. Let's determine the type and class of worms. 
18. Let’s explain the peculiarity of leeches.
Leeches have a better developed nervous system.
19. Let us explain the statement.
The statement is not true. Leeches are very sensitive to the purity of water and die if it is polluted. Oligochaetes withstand water pollution and can live for a long time in such reservoirs.
20. Write an answer about hirudia.
Hirudin is necessary to prevent blood clotting in the wound of the victim and in the stomach of the leech itself. If it is not produced, the leech will not be able to feed, as the blood will clot.
21. Let's name the role of leeches in medicine.
Leeches are used in medicine to reduce blood pressure in cases of hypertension and the threat of hemorrhage and stroke.
22. Let us indicate the characteristics of classes of annelids.
Classes of the type Annelids.
A - 1, 2, 8, 10, 16
B - 4, 6, 11, 12, 17
B - 3, 5, 7, 9, 14, 15
Let's write down the answers to crossword No. 1.
Answers:
1. Capsule
2. Belt
3. Polychaetes
4. Cavity
5. Chain
6. Oligochaetes
7. Tapeworm
8. Breathing
Keyword: rings
1. Find in the text of paragraph 1 the concepts indicated below and complete the sentences.
Zoology is the science of animals.
The main systematic category in biology is
2. Write what these scientists are famous for.
Aristotle - created a ladder of creatures.
A. Levenguk -
K. Linnaeus
M.V. Lomonosov -
3. Arrange the numbers of the following systematic categories in sequence from the “lowest” to the “highest” rank:
Answer: 1, 7, 2, 5, 3, 8, 4, 6.
4. What allows scientists from different countries to understand each other when describing animals?
5. After reading the text of paragraph 2, name the sciences that study animals:
Ethology is the science of animal behavior;
geography - the science of the patterns of distribution and distribution of animals on Earth;
Entology is the science of insects.
Ichthyology is the science of fish.
Ornithology is the science of birds.
6. Having studied the text of the paragraph, list the main areas of application of zoological knowledge.
There are examples of pairs or groups of cells that are in different locations and make essentially different connections, but that make similar connections to the cells they both contact and that share other common properties. However, a general search for such a grouping does not show anything statistically significant. One possible issue that may be important is that regional specialization of neurons, as discussed in, would create complications in any search for classes of neurons with equivalent synaptic potential.
Leeuwenhoek.
The entire body consists of one cell.
Because animals and plants feed on the same substances.
Roothoppers, radiolarians, sunfishes, sporozoans, flagellates, ciliates.
Root stalk - 7.
Formaminifera - 4.
Radiolaria - 1.
Volvox - 2.
Chlamydomonas - 5.
Euglena - 6.
Ciliates - 3.
All diseases come from dirty hands.
This does not mean that label-label agreement systems for determining synaptic connectivity do not exist, but simply that there are too few cells and too many variations exist to be inferred from the final connectivity data. A similar observation was made when a complete cell line was identified that was more reproducible than the nervous system. Although there are several suggestive repeat motifs, the overall layout of which progenitor cells produce is essentially disordered and mosaic, which correlates with position as a pattern in a line.
Lesson type: combined. Laboratory work .
Literature: Biology. Diversity of living organisms. 7th grade: educational for general education. institutions / N. I. Sonin, V. B. Zakharov. – 2nd ed., stereotype. – M.: Bustard, 2009. – 255 p.
Biology. Grade 7: lesson plans based on the textbook by N. I. Sonina, V. B. Zakharova / author. – comp. M. V. Vysotskaya. – Volgograd: Teacher, 2008. – 447 p.
Lesson progress: 45 min.
I. Organizational moment. 1 min.
II. Updating knowledge and skills, 10 min.
Frontal survey tests.
III. Learning new material, 25 min.
See lesson plans pp. 250-252.
IV. Consolidation of acquired knowledge. 5 minutes
Testing. See lesson plans pp. 251-252.
V. Homework.2 min.
Study the text on pp. 125-127; answer questions, prepare a speech about the classes of ringlets according to plan: taxonomy, diversity, habitats, living conditions, external structure, lifestyle, internal structure, reproduction, role.
VI. Summarizing. 2 minutes.
Subject general lesson: “Types: flatworms, roundworms, annelids”
Target: Summarize, consolidate knowledge about the organization and life of worms.
Tasks: Educational: Ensure that schoolchildren retain knowledge of basic biological concepts; skills to reveal relationships and interdependencies between organs, organ systems, as well as connections between the structure of worms and their environment; continue to build knowledge about the evolutionary process. Educational: Continue to develop students’ environmental culture and personal hygiene skills; to develop students’ cognitive interest and practical work skills; desire to independently search for knowledge; develop creative thinking; Developmental: Develop students' attention and observation skills; logical thinking, ability to establish cause-and-effect relationships, generalize, draw conclusions.
Equipment: “Worms” tables, wet preparations of liver fluke and
Lesson type: generalization of knowledge.
Methods: story, conversation, independent work, testing.
Providing classes: CP, ICT tables “Worms”, wet preparations of the liver fluke and
roundworms, earthworms, cards for independent work.
Lesson plan:
I. Organizational moment. (Welcome, preparing the class for work, presence of students).
II. Motivation for learning activities. (Message of the topic, goals of the lesson, Use in further activities, showing the relevance of knowledge of the structure and functioning of the human body for everyone).
III. Updating knowledge.
What types of worms do we know?
IV. Generalization.
Exercise 1.
Write down the numbers of signs characteristic of each type of worm.
Flatworms________
Roundworms________
Annelids______
Signs
1 Bilateral symmetry of the body.
2.One layer of muscle
3. Many representatives develop with transformation
4. Closed circulatory system
5. All representatives have a circulatory system
6. Free-living people have sense organs
7. Excretory organs are represented by tubules with stellate cells
8. Powerful cuticle that forms the covering of the worm
9. Hermaphrodites
10. Regeneration
11. Larval development occurs in the intermediate host
Task 2.
On the given card, color the drawing of the worm's organ system (green for the digestive organs, red for the circulatory organs, yellow for the nervous system organs), write the name of the organs.
Task 3
Give reasons for the statement: “Among the various worms, annelids are the most
highly organized"_________
Task 4
Consider an earthworm, a roundworm wet mount, and a liver fluke.
What structural features allow them to live in a particular habitat?
Fill the table.
Task 5.
Write down the numbers of the correct statements.
What conclusion can be drawn based on these statements?
1.The development of a dense network of capillaries in earthworms is associated with cutaneous respiration.
2.The skin of the worm is formed by muscle tissue.
3.The blood of annelids carries nutrients from the intestines to all organs of the body.
4.Oxygen enters the body of free-living flatworms and carbon dioxide is removed through the skin.
VI. Reflection. Summarizing.
The sense organs in the human body work in concert; damage to some sense organs can be partially compensated by others. Such interaction and interchangeability testifies to the great and not fully understood capabilities of the organism.
Assess the degree to which the goals set during the lesson have been achieved.
Students' assessment of the progress and results of the lesson: Liked..., Didn't like..., Didn't understand..., Learned... It was difficult... Grade for the lesson to the teacher.
Teacher's assessment of the work of the class and students in the lesson.
VII. Homework message.
1- review everything about worms, prepare for testing
2-optional:
1 Prepare a report about one or two types of worms
2. Make a crossword puzzle
Question 1. What features of annelids allowed them to populate most of the planet?
Annelids have acquired a number of features in structure and physiology that allowed them to survive in a variety of environmental conditions.
Firstly, annelids developed specialized locomotion organs, which gave them relative independence from the physical properties of their environment. These are parapodia in polychaetes, which enable movement in the water column and along the bottom, and bristles in oligochaetes, which help with movement in the soil.
Secondly, the nervous system and sensory organs have achieved significant development in annelids. Which allows you to increase your active lifestyle.
Thirdly, annelids have mechanisms that make it possible to tolerate unfavorable environmental conditions. For example, soil species of oligochaetes are characterized by diapause (see answer to the question
2), and some types of leeches are capable of falling into suspended animation (see answer to question 2).
Question 2. What adaptations do annelids have to endure unfavorable conditions? How does this happen?
In soil species, in the event of unfavorable conditions, worms crawl to depth, curl up into a ball and, secreting mucus, form a protective capsule; they enter diapause - a condition in which the processes of metabolism, growth and development slow down.
Leeches living in cold waters can fall into suspended animation in winter - a state of the body in which life processes are so slow that all visible manifestations of life are absent.
Question 3. What allows scientists to classify polychaetes, oligochaetes and leeches as the same phylum?
All these animals have a number of characteristics that characterize them as belonging to the same type - annelids. All of them are multicellular animals with an elongated worm-like body, which has bilateral symmetry and consists of individual rings (segmented structure). The internal cavity of these worms is divided by partitions into separate segments, inside of which there is liquid.
10. Classes of rings. Oligochaetes, or Oligochaetes, and Leeches
Searched on this page:
- What features of annelids allowed them to populate most of the planet?
- formation of mucus that allows soil worms to tolerate unfavorable conditions
- What is common in adaptations to endure unfavorable conditions in protozoa and oligochaetes?
- which allows scientists to classify the polychaetes of oligochaetes and leeches as one type
- what features of annelids allowed them to colonize large
9. Type Annelids, or Ringworms
10. Classes of rings
1. Continue filling out the pivot table on p. 13
2. Give reasons for the statement: “Among the various worms, annelids are the most highly organized.”
Annelids for the first time have a secondary body cavity and the cellular structure of the skin. A circulatory system appears in the internal structure. The excretory system is represented by more developed metanephridia. Most ringlets are free-living, some have something like legs - parapodia. Everyone has bilateral symmetry. There are sense organs.
3. Prove that the partitions present in the body of the annelid worm perform a protective function.
Each segment of annelids is separated by a septum and has a full set of nerve ganglia, nephridia, annular vessels and gonads. If the integrity of one segment is violated, this affects the life of the worm to a small extent.
4. List the structural features that help rings move well in different habitats.
Some types of ringbills have parapodia and setae for locomotion. Those species that do not have parapodia have bristles or their body is covered with mucus for better gliding. Developed vision, touch, balance, hearing
5. After studying the text of the paragraph, complete the diagrams
A) Digestive system of ringlets- genus, pharynx, esophagus, midgut, hindgut, anus
B) Nervous system of ringlets- peripharyngeal ring, ventral nerve cord
IN) Ring Sense Organs- vision, touch, taste, smell, hearing, balance
6. What happens if the ring body is divided into several parts?
Regeneration can occur and the lost parts will be restored.
7. Is it possible for sexual reproduction of ringlets without the formation of a girdle?
It’s not possible, eggs are getting into the girdle.
8. How are the number of eggs laid related to the care of offspring?
The fewer eggs, the more actively the female guards them
9. Name all possible ways of feeding polychaetes.
Among polychaete worms there are predators that feed on small marine animals. There are omnivores that filter water and eat plants.
10. Complete the sentences.
The development of polychaetes occurs in alternationlife forms . Their larvae not alike on adults. Each life form performs different functions: caring for offspring .
11. Complete the diagram “The significance of polychaetes in nature”
The meaning of polychaetes in nature:
- water filtration
- food for fish and aquatic animals
- destruction of decomposing residues in water bodies
12. What are the differences in the diet of polychaete and oligochaete worms?
Oligochaete worms feed on organic matter from plant remains of the soil, and among polychaetes there are also predators, omnivores, and herbivores.
13. What is common in the adaptations to endure unfavorable conditions among protozoa and oligochaetes?
Oligochaetes and protozoa are unpretentious to oxygen content and are resistant to unfavorable conditions. To withstand unfavorable conditions, many protozoa form a cyst, and oligochaetes form a protective capsule, and enter diapause. These formations are similar in their functions.
14. Using the text and pictures of the textbook, study the structure of an earthworm, and then complete laboratory work No. 3 “External structure of an earthworm.” Draw a drawing of an earthworm, marking the anterior and posterior ends of the body, segments, girdle, and bristles.
Draw a conclusion about what structural features allow worms to lead an underground lifestyle.
Conclusion:
The earthworm's body has a streamlined shape, which allows it to move freely underground. On the sides of each body segment there are two pairs of short bristles that help the worm move through the soil.
The longitudinal and circular muscles are well developed; the worm constantly contracts and compresses them, which helps it not only move underground, but also expand its passage.
15. List the characteristic features of leeches:
16. Name 2 types of food for leeches.
17. Look at the pictures. Label what type and class these worms belong to.
Type annelids
Tubifex class
Type Round
Class Ascaris
Leech Type
Class Cochlear
Type Annelids
Nemertine class
Type Flatworms
Class Ciliated worms
Type Flatworms
Class Tapeworm
18. After studying the text of the paragraph, explain why leeches are more sensitive than other worms to changes in the environment.
Leeches are very sensitive to the purity of the water in which they live, therefore, if it is polluted, they die
19. Is the statement true: “In dirty water it is difficult for oligochaetes to breathe, but leeches feel good”?
Not true. Oligochaetes are unpretentious to the purity of water and the lack of oxygen, so they can live in polluted waters, but leeches do not.
20. What happens if leeches stop producing hirudia?
Hirudin is necessary to prevent blood clotting in the wound of the victim and in the stomach of the leech itself. If it is not produced, the leech will not be able to feed, as the blood will clot.
21. For what purpose are leeches bought at the pharmacy?
Leeches are used in medicine to reduce blood pressure in cases of hypertension and the threat of hemorrhage and stroke.
22. Indicate the characteristics corresponding to each class of annelids.
Classes of the type Annelid worms:
A - Class Polychaete worms
B - Class Oligochaete worms
B - Leech Class
A - 2, 9, 16, 7, 17, 6
B - 10, 1, 12, 14, 15, 5
B - 13, 3, 8, 11, 15, 4
1. Continue filling out the pivot table on p. 13
2. Give reasons for the statement: “Among the various worms, annelids are the most highly organized”
Annelids for the first time have a secondary body cavity and the cellular structure of the skin. A circulatory system appears in the internal structure. The excretory system is represented by more developed metanephridia. Most ringlets are free-living, some have something like legs - parapodia. Everyone has bilateral symmetry. There are sense organs
3. Prove that the partitions present in the body of the annelid worm perform a protective function
Each segment of annelids is separated by a septum and has a full set of nerve ganglia, nephridia, annular vessels and gonads. If the integrity of one segment is violated, this affects the life of the worm to a small extent
4. List the structural features that help rings move well in different habitats
Some types of ringbills have parapodia and setae for locomotion. Those species that do not have parapodia have bristles or their body is covered with mucus for better gliding. The muscular system of all rings is represented by circular and longitudinal muscles
5. After studying the text of the paragraph, complete the diagrams
a) Digestive system of ringlets
b) Nervous system of ringlets
c) Sense organs of rings
6. What happens if the ring body is divided into several parts?
Regeneration may occur and the worm will restore the lost parts. That is, asexual reproduction will occur
7. Is it possible for sexual reproduction of ringlets without the formation of a girdle?
Maybe. In some polychaete worms living in the seas and belonging to the phylum Annelids, reproduction occurs in water, fertilization is external. But in most ringlets, reproduction occurs with the help of a belt
8. How are the number of eggs laid related to the care of offspring?
There is a direct relationship between the number of eggs laid and care for the offspring. Some polychaetes lay a few eggs, and the female guards them. This means that Annelids are more advanced than previous types of worms
9. Name all possible ways of feeding polychaetes
Among polychaete worms there are predators that feed on small marine animals. There are omnivores that filter water and eat plants.
10. Complete the sentences
The development of polychaetes occurs with alternation of life forms. Their larvae do not resemble adults. Each life form performs different functions: reproduction, dispersal, self-preservation. Some polychaetes are observed caring for offspring
11. Finish the diagram
The meaning of polychaetes in nature
1. Filter the water
2. They are fish food
3. They feed on the remains of dead animals
12. What are the differences in the diet of polychaete and oligochaete worms?
Oligochaete worms feed on organic matter from plant remains of the soil, and among polychaetes there are also predators, omnivores, and herbivores
13. What is common in the adaptations to endure unfavorable conditions among protozoa and oligochaetes?
To withstand unfavorable conditions, many protozoa form a cyst, and oligochaetes form a protective capsule, and enter diapause. These formations are similar in their functions
14. Using the text and pictures of the textbook, study the structure of an earthworm, and then complete laboratory work No. 3 “External structure of an earthworm.” Draw a drawing of an earthworm, marking the anterior and posterior ends of the body, segments, girdle, and bristles.
Draw a conclusion about what structural features allow worms to lead an underground lifestyle
Conclusion: The primary body cavity is supporting. It contains a liquid that gives the worm's body elasticity.
15. List the characteristic features of leeches:
1) Constant number of body segments
2) The presence of suction cups for attachment to the victim’s body or substrate
3) No bristles on the body
4) All leeches live in an aquatic environment
16. Name 2 types of food for leeches
17. Look at the pictures. Label what type and class these worms belong to
18. After studying the text of the paragraph, explain why leeches are more sensitive than other worms to changes in the environment
Leeches have a better developed nervous system
19. Is the statement true: “In dirty water it is difficult for oligochaetes to breathe, but leeches feel good”?
The statement is not true. Leeches are very sensitive to the purity of water and die if it is polluted. Oligochaetes withstand water pollution and can live for a long time in such reservoirs
20. What happens if leeches stop producing hirudia?
Hirudin is necessary to prevent blood clotting in the wound of the victim and in the stomach of the leech itself. If it is not produced, the leech will not be able to feed, as the blood will clot
21. For what purpose are leeches bought at the pharmacy?
Leeches are used in medicine to reduce blood pressure in cases of hypertension and the threat of hemorrhage and stroke
22. Indicate the characteristics corresponding to each class of annelids
A - 1, 2, 8, 10, 16
B - 4, 6, 11, 12, 17
B - 3, 5, 7, 9, 14, 15
Crossword No. 1. "Worms"
1) Give reasons for the statement: “Among the various worms, annelids are the most highly organized.”1. Capsule
3. Polychaetes
4. Cavity
5. Chain
6. Oligochaetes
8. Breathing
Keyword: rings
___________________________________________________________________
2) List the characteristic signs of leeches:
1)______________________________________________
2)______________________________________________
3)______________________________________________
4)______________________________________________
2. segmentation of protozoa, sponges, coelenterates, roundworms, flatworms, annelids, mollusks, echinoderms.
3. fertilization of protozoa, sponges, coelenterates, roundworms, flatworms, annelids, mollusks, echinoderms.
4. protection of protozoa, sponges, coelenterates, roundworms, flatworms, annelids, mollusks, echinoderms.
Please answer any of these points, otherwise the teacher will kill me and give me a 2, urgently needed by tomorrow, thanks in advance!)))
only from lime; b) only from a horn-like substance; c) from lime and horn-like substance; d) from a horn-like substance, lime and mother-of-pearl. 3. A shell formed by two valves has a) pearl barley, toothless mussels, and mussels; c) pond snails, reels, rapana b) squid, cuttlefish, octopus; d) slugs, grape snail. 4. The body of gastropods is divided into: a) head, torso and muscular leg; b) head, tentacles and torso; c) torso and muscular leg; d) head and torso. 5. Bivalves feed mainly on: a) filamentous algae; b) fresh crustaceans - daphnia and cyclops; c) organic particles and microorganisms; d) worms and insect larvae. 6. In the phylum of mollusks, eyes have: a) only bivalve eyes; c) gastropods and cephalopods; b) only cephalopods; d) representatives of all classes. 7. The most highly organized of mollusks include: a) gastropods; c) cephalopods; b) bivalve; d) spadefoot. 8. Gastropods move: a) with the help of a muscular leg; b) with the help of a muscular leg and tentacles; c) only due to water pushed out of the mantle cavity; d) with the help of tentacles and water pushed out of the mantle cavity. 9. Toothless respiration is ensured by the supply of oxygen through a) gills; c) the entire surface of the body; b) inlet siphon; d) lungs. 10. The largest animals among modern invertebrates: a) octopuses; c) deep-sea squids; b) tapeworms; d) jellyfish. II. Distribute representatives of the mollusc type into classes
1) Class Gastropods_________________ a)
pearl barley; g) oyster; 2) Class Bivalves______________ b) cuttlefish; e) octopus; 3) Class Cephalopods ________________ c) slug; h) pond snail d) grape snail; e) oyster;
1. Continue filling out the pivot table on p. 13.
2. Give reasons for the statement: “Among the various worms, annelids are the most highly organized.”
Annelids for the first time have a secondary body cavity and the cellular structure of the skin. A circulatory system appears in the internal structure. The excretory system is represented by more developed metanephridia. Most ringlets are free-living, some have something like legs - parapodia. Everyone has bilateral symmetry. There are sense organs.
3. Prove that the partitions present in the body of the annelid worm perform a protective function.
Each segment of annelids is separated by a septum and has a full set of nerve ganglia, nephridia, annular vessels and gonads. If the integrity of one segment is violated, this affects the life of the worm to a small extent.
4. List the structural features that help rings move well in different habitats.
Some types of ringbills have parapodia and setae for locomotion. Those species that do not have parapodia have bristles or their body is covered with mucus for better gliding. The muscular system of all rings is represented by circular and longitudinal muscles.
5. After studying the text of the paragraph, complete the diagrams.
a) Digestive system of ringlets
b) Nervous system of ringlets
c) Sense organs of rings
6. What happens if the ring body is divided into several parts?
Regeneration may occur and the worm will restore the lost parts. That is, asexual reproduction will occur.
7. Is it possible for sexual reproduction of ringlets without the formation of a girdle?
Maybe . In some polychaete worms living in the seas and belonging to the phylum Annelids, reproduction occurs in water, fertilization is external. But in most ringlets, reproduction occurs with the help of a belt.
8. How are the number of eggs laid related to the care of offspring?
There is a direct relationship between the number of eggs laid and care for the offspring. Some polychaetes lay a few eggs, and the female guards them. This means that Annelids are more advanced than previous types of worms.
9. Name all possible ways of feeding polychaetes.
Among polychaete worms there are predators that feed on small marine animals. There are omnivores that filter water and eat plants.
10. Complete the sentences.
The development of polychaetes occurs with alternation of life forms. Their larvae do not resemble adults. Each life form performs different functions: playback, resettlement, self-preservation. Some polychaetes are observed caring for offspring.
11. Complete the diagram.
The meaning of polychaetes in nature:
1. Filter the water.
2. They are fish food.
3. They feed on the remains of dead animals.
12. What are the differences in the diet of polychaete and oligochaete worms?
Oligochaete worms feed on organic matter from plant remains of the soil, and among polychaetes there are also predators, omnivores, and herbivores.
13. What is common in the adaptations to endure unfavorable conditions among protozoa and oligochaetes?
To withstand unfavorable conditions, many protozoa form a cyst, and oligochaetes form a protective capsule, and enter diapause. These formations are similar in their functions.
14. Using the text and pictures of the textbook, study the structure of an earthworm, and then complete laboratory work No. 3 “External structure of an earthworm.” Draw a drawing of an earthworm, marking the anterior and posterior ends of the body, segments, girdle, and bristles. Draw a conclusion about what structural features allow worms to lead an underground lifestyle.
15. List the characteristic features of leeches:
- Constant number of body segments (33).
- The presence of suction cups for attachment to the body of the victim or substrate.
- Lack of bristles on the body.
- All leeches live in an aquatic environment.
16. Name 2 types of food for leeches.
17. Look at the pictures. Label what type and class these worms belong to.
18. After studying the text of the paragraph, explain why leeches are more sensitive than other worms to changes in the environment.
Answer: Leeches have a better developed nervous system.
19. Is the statement true: “In dirty water it is difficult for oligochaetes to breathe, but leeches feel good”?
The statement is not true. Leeches are very sensitive to the purity of water and die if it is polluted. Oligochaetes withstand water pollution and can live for a long time in such reservoirs.
20. What happens if leeches stop producing hirudia?
Answer: Hirudin is necessary to prevent blood clotting on the wound of the victim and in the stomach of the leech itself. If it is not produced, the leech will not be able to feed, as the blood will clot.
21. For what purpose are leeches bought at the pharmacy?
Answer: Leeches are used in medicine to reduce blood pressure in case of hypertension and the threat of hemorrhage and stroke.
22. Indicate the characteristics corresponding to each class of annelids.
Answer:
A - 1, 2, 8, 10, 16
B - 4, 6, 11, 12, 17
B - 3, 5, 7, 9, 14, 15
Let's write down the answers to crossword No. 1.
Answers:
1. Capsule
2. Belt
3. Polychaetes
4. Cavity
5. Chain
6. Oligochaetes
7. Tapeworm
8. Breathing
Keyword: rings