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

Description

"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: Generally able to move freely

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 tasks

1. What are the main characteristics of coelenterates and platyhelminthes?

2. What is the relationship between coelenterates and platyhelminthes and human life?

Representative animal - hydra

1. Ecological 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,

Take a closer look at the shape of the hydra. What’s so special about it?

The role of stinging cells

Stinging cells are the unique attack and defense weapons of coelenterates. Most of them contain stinging wires and venom, especially in the tentacles. When encountering prey or predators, they can quickly eject the stinging threads and inject venom into the prey or predator through the stinging threads to anesthetize or kill them.

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 - 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.

Trial test

1. Main characteristics of coelenterates (cnidarians):

(1) The body is __________________;

(2) The body wall is composed of ______ germ layers;

(3) There is ______; there is no _______.

(4) There are ______ on the body surface.

2. Characteristics of flatworms;

(1) The body is ______ symmetrical (also called bilateral symmetry);

(2) dorsal and ventral ______;

(3) The body wall is composed of ______ germ layers;

(4) There is ______ but no ______.

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

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

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Update Time: 2024-09-26

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

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