"Fish" PPT courseware on the main groups of animals

Description

"Fish" PPT courseware on the main groups of animals

learning target

1. Understand the types and differences between invertebrates and vertebrates.

2. Name the common types of fish.

3. Explore the way fish move and breathe, and outline the main characteristics of fish.

4. Pay attention to the relationship between fish and human life.

Crucian carp skeleton

Observe the crucian carp spine and the vertebrae that make up the spine in the picture above.

Which animals have no spine? Is the spine involved in fish movement?

animal

Invertebrates

Coelenterata: polyps, jellyfish, sea anemones

Platyhelminthes: planarians, tapeworms, schistosomiasis

Phylum Nematoda: roundworms, pinworms, filarial worms

Annelida: earthworms, leeches, lugworms

Molluscs: mussels, octopus, razor clams

Arthropods: locusts, dragonflies, shrimps

vertebrate

Fish class: herring, Chinese sturgeon, shark

Amphibians: frogs, toads, giant salamanders (salamanders)

Reptiles: turtles, turtles, snakes, lizards

Order Birds: chicken, duck

Mammalia: pig, horse, sheep, human

1. A variety of fish

Bighead carp: Bighead carp has a large head, also known as "fat-headed fish". Its back is dark black with irregular black spots. It is commonly known as silver carp. It lives in the middle and upper layers of the water and feeds on water fleas and other zooplankton.

Silver carp: It has a lighter body color and is also called silver carp. It moves in the upper layers of the water and feeds on diatoms, green algae and other phytoplankton.

Grass carp: The body color is greenish-yellow. It lives in the middle and lower layers of the water and on the shores with many aquatic plants. It mainly feeds on aquatic plants.

Black carp: The body color is blue-black. It lives in the middle and lower layers of the water and mainly feeds on molluscs such as snails and clams.

Grouper: The body color is similar to the color of the surrounding rocks. The larvae are female fish, and when they develop to a certain stage, they can transform into male fish.

Main characteristics of fish

Observe and think:

1. What are the characteristics of the fish’s appearance? What structures are there on the body surface? Is it helpful to overcome the resistance of water movement?

The body of the fish is divided into head, trunk and tail; most of them have flat sides, which is helpful for overcoming the resistance of water.

2. Observation and thinking

(1) What are the characteristics of the fish’s appearance? What does it mean for fish’s aquatic life?

The body of the fish is divided into head, trunk and tail; most of them have flat sides, which is helpful for overcoming the resistance of water.

(2) Touch the surface of the fish with your hands and see what it feels like. Talk about your opinions.

Fish have scales and mucus on their body surface; they both protect the body and help overcome the resistance of the water.

(3) Observe the movement of fish. Is it true that fish only rely on their fins for locomotion?

Incomplete. Fish have a spine in their body, and the muscles attached to the spine can generate power for movement.

Fish complete swimming movements through the swing of the trunk and tail and the coordinated action of the fins.

Class summary

1. Animals are divided into vertebrates and invertebrates based on whether they have a backbone made of vertebrae.

2. Main characteristics of fish

Live in water; body surface is often covered with scales; breathe with gills; swim through the swing of tail and trunk and the coordination of fins.

Standard training

1. Fish are vertebrates because ( )

A. Fish have fins for flexible movement

B. Fish have swim bladders that allow them to stay in different water layers

C. Fish have a spine, which is made up of vertebrae

D. Fish have scales that reduce swimming resistance

2. Which of the following has nothing to do with the aquatic life of crucian carp ( )

A. The body is streamlined

B. There are fins on the body

C. There is a spine made up of vertebrae

D. Breathe with gills

3. The way oxygen in the water enters the fish body is ( )

A. Water → mouth → gills → blood

B. Water → gills → blood

C. Water → nose → gills → blood

D. Water → mouth → nose → gills → blood

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

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File Info

Update Time: 2024-11-01

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

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