"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 4

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"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 4

Guess: Is the bird of paradise an animal or a plant?

Native to southern Africa. It likes a warm and humid climate and is afraid of frost and snow. It is a light-loving plant that needs full sunlight in winter and a little shade during strong light in summer. The soil needs to be loose, fertile and well drained.

Birds of paradise have special personalities and are loyal to love. Once they fall in love, they stay together for life. They never fight or fight, and they always care and love each other. Once they lose their partner, the other bird will never remarry or remarry, but will go on a hunger strike. die .

Characteristics that distinguish animals from plants

1: Generally able to move freely

2: Animals cannot produce organic matter through photosynthesis like plants. They can only obtain ready-made organic matter by ingesting food to survive and reproduce. (Different sources of nutrition: autotrophic, heterotrophic)

1. Coelenterates (there are 11,000 existing species of coelenterates)

Representative animal - hydra

1. Living environment and living habits

Hydroids mostly live in clean fresh water with slow water flow and abundant aquatic plants. They often attach to aquatic plants or other objects and feed on small water fleas and worms.

2. Morphological structure

Body color: light brown

Body shape: cylindrical, mouth upward, adaptable to sedentary life;

Body length: about 1CM,

Observe carefully: Can the body of the hydra be divided into back and ventral surfaces, left and right sides?

3. How many layers of cells does the body wall of a polyp consist of? How many cavities are there in the body? Where do food and debris come in and out?

The relationship between coelenterates and humans

1. Jellyfish can be processed into highly nutritious seafood;

2. Coral reefs are the main habitat and refuge for marine life;

Let us take care of this beautiful coral reef

Main characteristics of coelenterates

1. The body is radially symmetrical

2. Mouth but no anus

3. There are stinging cells on the body surface

Representative animal: Hydra. Jellyfish, jellyfish, sea anemone, coral polyps

practise

1. Which of the following are coelenterates ( )

A. Hydra B. Roundworm C. earthworm d. river mussel

2. Which of the following is not a common characteristic of coelenterates ( )

A. Complex structure b. live in water

C. There is a digestive cavity in the body D. With mouth but no anus

3. Which of the following is not a coelenterate ( )

A. Sea anemone B. Jellyfish c. Coral polyps D. trumpet bug

4. How do jellyfish and other coelenterates excrete food residues ( )

A. Expelled from the anus B. Expelled from the mouth C. Expelled from the anus D. discharged from cells

2. Flatworms

Representative animal - planarian

1. Body structure of planarian

⑴How do planarians hunt and digest food?

Catching food with the pharynx sticking out of the mouth

Food is digested in the small intestine

⑵What is the body shape of planarians?

What are the benefits of such a body shape?

The body's dorsoventrally is flat and can be divided into front and rear, left and right, dorsal and ventral, and is bilaterally symmetrical (left-right symmetry).

The front-end sensory organs are concentrated and have specialized motor organs that can produce directional movement. Such a body shape makes movement more accurate, rapid and effective, which is conducive to movement, predation and defense.

2. Other flat animals:

pork tapeworm

Schistosoma

1. What is the living environment of flatworms?

Most flatworms are parasitic in humans and animals, such as Clonorchis sinensis, schistosomiasis, and tapeworms, and a few live freely. Like planarians.

Parasitism: A lifestyle in which one organism lives outside, on, or inside another organism and obtains nutrients from it. (One party benefits and the other party suffers)

2. What are the characteristics of these parasites?

The digestive organs of these parasites are very simple, and some do not even have specialized digestive organs. They live by obtaining nutrients from the host body, and their reproductive organs are very developed.

3. What is the relationship between flatworms and humans?

Answer: Parasites that live in the human body can cause human diseases. For example, the schistosomiasis prevalent in some areas of southern my country is caused by __________ infection.

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"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 6:

"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 6 Coelenterates Representative Animals Hydra Ecological Habits Hydra mostly live in clear water streams with slow flow and abundant aquatic plants, often attached to aquatic plants or other objects, with small Feed on water fleas and worms. Explore..

"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 5:

"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 5 Study Guide 1. What is the living environment of hydra? 2. What is the shape of hydra? 3. What is the structure of hydra? The body wall is composed of several layers of cells. There are several cavities in the body. Where does food and debris come from...

"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 3:

"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 3 Characteristics that distinguish animals from plants 1: Animals cannot produce organic matter through photosynthesis like plants, and can only obtain ready-made organic matter by ingesting food to survive and reproduce. . 2:..

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Update Time: 2024-11-22

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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