"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 2

Description

"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 2

There are approximately 1.5 million known species of animals. Scientists divide them into two categories: vertebrates and invertebrates according to whether they have backbones in their bodies.

Do you also know which animals are invertebrates and which animals are vertebrates?

learning target

1. Take hydra as an example to understand the morphological structure and physiological characteristics of coelenterates

2. Take planarians as an example to understand the morphological structure and physiological characteristics of flatworms

3. Recognize the main characteristics of coelenterates and platyhelminthes and their relationship with humans

The relationship between coelenterates and humans

Jellyfish can be processed into highly nutritious seafood;

The calcareous material secreted by coral polyps constitutes coral reefs. Coral reefs can form islands, strengthen banks, and are also the main habitat and refuge for marine life.

However, due to factors such as over-exploitation and environmental pollution, coral reefs have been severely damaged.

Representative animal - planarian

1. Ecological habits

Planarians live under rocks in clear freshwater streams; they feed on small animals in the water;

2. External form

The body is soft, willow leaf-shaped, flat dorsally and ventrally, and symmetrical on both sides; the body length is generally 1~1.5 cm;

Front end: The front end is triangular in shape, with two photosensitive black eyespots on both sides of the back;

Ventral surface: light in color, with a mouth and a tubular pharynx inside the mouth. The food eaten is digested in the intestines, and the digested residue is still discharged from the mouth. There is a mouth but no anus. Planarians can crawl on surfaces like swimming

Life history of Japanese blood-sucking worms:

Final host: humans and livestock

Intermediate host: snail

The main characteristics of Platyhelminthes are: body dorsal and ventral _____;

_____ is symmetrical; there is _____ but there is no _____.

_____, _____, and _____ are all flatworms.

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For more information about the PPT courseware "The Main Groups of Animals Coelenterates and Platyhelminthes", please click the Main Groups of Animals ppt Coelenterates and Platyhelminthes ppt tag.

"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 4:

"Coelenterates and Platyhelminthes" Main Groups of Animals PPT Courseware 4 Guess: Is 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...

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Update Time: 2024-11-25

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

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