"Fish" Main groups of animals PPT courseware 4

"Fish" Main groups of animals PPT courseware 4

Knowledge Point 1: Groups of Animals

Animals are diverse, and there are about ___ million species known so far. According to the presence or absence of ___ in animals, they are divided into ___ animals and ___ animals. According to their living environment and movement methods, animals can be divided into ____ animals, ____ animals, and ____ animals.

Knowledge point 2: The most common aquatic animal—fish

Fish can be divided into ___ fish and ___ fish. Among them, ___, ___, ___, and ___ among freshwater fish are called the “four major fish” in my country. There are two important features of fish adapting to life in the water: first, they can obtain food and defend against enemies by swimming, and second, they can ___ in the water.

Knowledge point 3: Fish swimming

1. Observe the appearance of the fish and the movements of various fins when swimming:

(1) The body shape is ____, and the body surface is covered with ____; the body surface can secrete ____, which can reduce the resistance to movement in water.

(2) Fins: Fins are locomotion organs. The pectoral fins, pelvic fins, and dorsal fins play the role of maintaining the forward direction. The left and right swings of ____ and ____ generate forward momentum, and various fins play a coordinating role.

2. Explore the role of fish fins in swimming: To explore the functions of fish fins, you can use _____, _____, and _____.

(Hint) An experiment made by imitating an experimental subject or conducting an experiment imitating an experimental _____ is called a simulation experiment.

discuss

1. When a fish swims, it mainly relies on the left and right swings of the body's trunk and tail to stir up the water flow to generate forward momentum, and the fins play an auxiliary role. When a fish is moving, its pectoral fins, pelvic fins and dorsal fins all play a role in maintaining the balance of the fish body, and the tail fin plays a role in determining the direction of the fish's movement.

2.Can’t. Because various fins often move at the same time, it is difficult to tell what functions each fin plays by just direct observation in nature.

The Chinese sturgeon is a national first-level protected animal. It is a migratory fish in rivers and seas. The largest individual can reach more than 500 kg. It is the largest fish in the Yangtze River, so it is known as the "King of Yangtze River Fish". The general life span can reach more than 30 years.

Chinese sturgeons mainly live in my country's offshore continental shelf waters and migrate to the Yangtze River when breeding. There are also distribution records in the Pearl River and Minjiang River in my country. Listed as endangered by the World Conservation Union (IUCN).

Chinese sturgeon is very precious. It is a rare "living fossil" that first appeared in the Mesozoic Era 150 million years ago. In terms of taxonomic status, the Chinese sturgeon is between cartilaginous fish and bony fish. Its bones are cartilage and its body has hard bony scales. It is a cartilaginous teleost fish. Chinese sturgeon occupies an extremely important position in classification and is an important reference for studying fish evolution.

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For more information about the "Main Groups of Animals Fish" PPT courseware, please click the "Main Groups of Animals ppt Fish ppt" tag.

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