"Main Groups of Animals" PPT courseware

Description

"Main Groups of Animals" PPT courseware

Part One: Scenario Introduction

Please observe carefully, what kind of animals are they? What are their common characteristics?

learning target

1. Understand common segments, soft bodies, arthropods and echinoderms and their main characteristics.

2. Enhance observation ability, thinking ability, problem analysis ability, language expression ability, etc. by participating in learning activities such as "Observing Insect Specimens".

3. Through understanding of different groups of animals, you can further appreciate the diversity of animal species.

PPT on the main groups of animals, part 2: course exploration

Explore theme one

annelids

The body of annelids is cylindrical or long and flat, symmetrical from left to right, and composed of many body segments connected front to back. There are about 13,000 species of annelids, including earthworms, lugworms, leeches, etc. They live in seawater, fresh water, soil and terrestrial moist environments, and are widely distributed.

Earthworms live in moist, loose soil rich in organic matter. They burrow in the soil during the day and climb out of the ground at night to feed on organic matter in the soil or plant stems and leaves.

The body of earthworms is generally blue-gray or dark red and has a long cylindrical shape. The body surface is moist and slimy. There are bristles on the abdomen. The shapes of each body segment are similar. In mature individuals, there is a small swollen section at the front end of the body, which is dark in color and is called an annulus. Earthworms rely on muscle contraction and the assistance of body surface setae to move. There is a true coelom inside the body.

1. The main characteristics of annelids: the body is composed of many body segments; it has a true body cavity.

2. Common annelids: earthworms, leeches, lugworms, and leeches.

3. The relationship between annelids and humans

(1) Earthworms can improve the soil.

(2) Fish bait: Earthworms and lugworms can be used as fish bait. Since lugworms are preyed upon by fish, the number of lugworms can affect the distribution of fish.

(3) Affects the health of humans and animals: Most leeches suck the blood of humans or animals as food and are harmful to humans and animals.

(4) Medical and medicinal uses: Since leeches have the habit of sucking blood, leeches have been used to suck pus and blood to treat diseases since ancient times. Nowadays, leeches are still used for medical bloodletting in Europe and some countries. Leeches can be used as medicine to treat bruises, break blood and stimulate menstruation, reduce swelling and detoxification, and lower blood pressure.

Explore theme two

Mollusk

A type of invertebrate with a soft body. They live in a wide range of seawater, freshwater and land. There are more than 115,000 recorded species. Most of the animals in this phylum are covered with various shells, so they are often called shellfish.

1. Common molluscs include river clams living in fresh water, snails living in moist places on land, squid living in the ocean, etc.

2. Main characteristics of molluscs

body soft

Has a mantle

There is a shell on the surface of the body (or an inner shell wrapped by a mantle)

3. The relationship between molluscs and humans

(1) Many types can be eaten, such as clams, razor clams, oysters, squid, snails, river mussels, abalone, scallops, mussels, etc. Medicinal uses: Some molluscs can be used as traditional Chinese medicinal materials, such as abalone shells, squid jellyfish, etc.

(2) In the arts and crafts industry, the shells of some molluscs have unique shapes and beautiful colors, and can be used to make handicrafts, such as treasures, cone snails, torreya snails, harp snails, etc.

(3) There are also some species that are poisonous and can spread diseases and harm crops. For example, most species of snails eat plants and are harmful to agricultural production.

(4) Damage to harbor buildings and transportation facilities, harmful to human beings.

PPT on the main groups of animals, part 3: Class summary

1. Annelida: The body is composed of annular body segments (such as lugworms and earthworms) and is slender.

Soft, peristaltic, muscle contraction and bristles support movement, and breathe through the skin on the body surface.

application:

1. Loose the soil and increase soil fertility;

2. Promote material circulation;

3. Can be used as medicine.

2. Molluscs: The body is soft and divided into three parts: head, feet and viscera. There is a mantle outside the body and the body is protected by shells (such as squid, octopus, scallops, snails, etc.).

3. Arthropods: The body has many segments and divisions. The body surface has an exoskeleton, feet and tentacles.

Angular segmentation. It is the most diverse and numerous group in the animal kingdom. Class Insecta

(locusts), Crustacea (shrimps), Arachnida (spiders), Myriapoda (centipedes).

Characteristics of Insecta: 1. Most insects have wings and can fly.

2. It is divided into three parts: head, thorax and abdomen. The locomotion organs - wings and feet are all born in the thorax.

3. The exoskeleton is a tough shell covering the inside of the insect's body. It protects and supports the soft internal organs and prevents the evaporation of water in the body.

Insects are the only invertebrates that can fly.

4. Echinoderms: Living in seawater, five-radiation symmetry, such as starfish, sea urchins, and sea cucumbers.

PPT on the main groups of animals, part 4: training to meet standards

1. Among the following animals, which one is a mollusk ( )

A. Octopus B. Daphnia C. Sea anemone D. Chinese sturgeon

2. Which of the following is not an annelid ( )

A. Earthworm B. Nereis c. leech d. cocoon

3. The most diverse animal on earth is ( )

A. Molluscs B. Insects C. Birds D. mammal

4． Among the following statements about the impact of earthworms on the natural environment, which one is wrong ( )

A. Earthworms can improve soil fertility

B． Earthworms remove a lot of trash from the soil

C. Earthworms can improve soil structure and facilitate plant root respiration.

D. Earthworm activity can damage young plant roots

5. Which of the following organisms can cultivate precious pearls ( )

A. Sail clam B． Squid c. Bao D. Oyster

Keywords: Beijing Normal University Edition Biology PPT courseware for eighth grade volume 2 free download, PPT download of the main groups of animals, .PPT format;

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Update Time: 2024-11-20

This template belongs to biology courseware Beijing Normal University Edition Eighth Grade Biology Volume 2 industry PPT template

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