"Coelenterates and Platyhelminthes" PPT courseware on the main groups of animals

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"Coelenterates and Platyhelminthes" PPT courseware on the main groups of animals

In this chapter, animals are classified into coelenterates, platyhelminthes, linear animals, annelids, molluscs, arthropods, fish, amphibians, reptiles, birds, and mammals in order from lower to higher organisms.

learning target:

1. By observing the pictures, we can recognize the morphological structure of hydra and summarize the main characteristics of coelenterates.

2. By observing the pictures, we can understand the morphological structure of planarians and summarize the main characteristics of flatworms.

3. Combined with daily life, understand the relationship between coelenterates, platyhelminthes and humans.

【Self-learning】

Read 2 to 5 pages of the text, think about the following questions, and mark them in the textbook.

1. Significant differences between animals and plants: Animals, like plants, use ____ to ____ organic matter and can only rely on ____ food to obtain ____ to survive and reproduce.

2. Most species of common coelenterates live in the ocean, such as ___, ___, ___, ___, etc.; a few species live in fresh water, such as ___.

3. Hydra lives in fresh water with slow water flow and lush aquatic plants. The body is almost transparent and about ____cm long. One end is on water plants and other objects, and the other end has ____, with ____ tentacles extending around it, used for exploration and __________.

4． The body of the hydra can only be divided into ____, and there are ____ sections through the longitudinal axis of the body to divide the body into two symmetrical parts. This shape is called _______. This kind of body structure makes it easier for it to catch prey from all directions and defend itself from the surrounding environment.

5. Looking at the schematic diagram of a longitudinal section of a hydra, its body is composed of two inner and outer germ layers - ___________ and ___. The cavity enclosed in the center is called __________. It is connected with the mouth, and both __________ and __ come in and out through the mouth. In the ectoderm there is __________, which is the attack weapon of coelenterates __________ and __________, especially in __________.

6. The main characteristics of coelenterates: __________;

【Cooperative Research】

Students in groups work together to discuss and complete the following questions:

1. Can the body of a hydra be divided into back and ventral surfaces, left and right sides? What does this body shape have to do with predation?

2. How do hydra prey on water fleas? Presumably how it digests water fleas?

3. There are stinging cells in the ectoderm of Hydra. Why are they especially numerous in the tentacles? Someone was stung by a jellyfish while swimming at the beach. Why?

【Standard Compliance Test】

1. The special cells possessed by coelenterates are ( )

A. Glandular cells B. cnidocytes c. Amoebocytes D. collar cells

2. Among the following animals, the free-living coelenterate is ( )

A. Schistosomiasis B. Pork tapeworm C. Planarian d. sea ​​anemone

3. Hydra will perform ( ) when nutritional conditions are good

A. Sexual reproduction b. Schizogony C. Budding reproduction D. sporogeny

4． Which germ layer of the planarian body forms the muscle layer of the body ( )

A. Ectoderm B. Mesoderm C. Endoderm D. lateral germ layer

5. The mouth of the planarian is located ( )

A. Nearly 1/3 of the rear end of the ventral surface of the head B. Nearly 1/3 of the rear end of the ventral surface of the body

C. Nearly 1/3 of the front end of the ventral surface of the head D. 1/2 of the ventral surface of the body

6. The free-living flatworm is ( )

A. Schistosomiasis B. Planarian C. Plasmodium D. pork tapeworm

7. Schistosoma is transmitted by which of the following methods ( )

A. Contact with infected water B. Eating undercooked fish C. Mosquito bites D. Not hygienic

think

1. What is the connection between flatworms and our lives?

2. Compared with platyhelminthes and coelenterates, which one is more advanced? Why?

Representative animal - Schistosoma japonicum

1. Harm: schistosomiasis, hepatosplenomegaly, ascites, loss of labor, death

2. Parasite site: portal vein and mesenteric vein of mammals;

3. Intermediate host: snail

4. Infection status: larvae

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Update Time: 2024-10-02

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

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