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Qingdao edition third grade science volume 2, various animal PPT
Part One: Pre-class extension
The animal world is a huge kingdom. Do you know much about it?
There are a variety of animal specimens and objects in our biology laboratory. Fish, frogs, snakes, pigeons, rabbits, etc. are familiar to you. How do you observe them and get to know them?
Pre-class extension:
Refer to the skill card, observe specimens or real objects of fish, frogs, snakes, birds, beasts and other animals, and understand the external morphological characteristics of their bodies. What is the relationship between these characteristics and their living environment and living habits?
How to observe animals scientifically
When observing the shape of an animal, we usually first observe the whole body and then the parts. First observe the animal's body shape and color, and then gradually observe the various parts of the animal's body. The observation of each part is generally carried out from front to back. For example, the order of observing mammals is: head → neck → trunk → limbs → tail. After observing each part, you need to return from the part to the whole to understand the position of each part in the whole and the relationship between each part.
Various animal PPT, part 2 content: In-class exploration:
Through observation, did you find any characteristics of goldfish and carp?
Physical characteristics: Scales on the body surface
Living place: in the water
Breathing: gills
Movement: fin tail
Reproduction: eggs
Fish generally have scales on the surface of their bodies, use gills to breathe, and use fins to move. They live in the water throughout their lives and reproduce their offspring with eggs.
Various animal PPT, the third part: cooperation and communication:
What is the relationship between an animal's body shape and structure and its food, habits and living environment?
The morphological structure of animals is suitable for their feeding habits, habits and living environment. For example, a woodpecker has four toes on its feet, two toes pointing forward and two toes pointing backward. There are sharp claws on the ends of the toes, which are suitable for grabbing rough bark and jumping on the trunk. The beak is straight and hard, with a sharp end like a chisel. The beak can peck through the bark of trees to search for pests lurking beneath the bark. Another example is that the owl's feet are strong and powerful, with long and sharp claws on the toes. The beak is hard, pointed at the end, and curved downward. These characteristics make it easy for the owl to catch small animals, and are suitable for the owl's feeding habits.
How to observe animals
Observation is the most basic method for studying animals. Through observation, we can obtain first-hand material from the objective world. Therefore, observation is an important means of scientific discovery and an important way to test scientific hypotheses and theories. To objectively reflect the observed things, observation must use scientific methods and basic skills.
Commonly used scientific observation methods:
Sequential Observation Generally speaking, observations in biological experiments should follow the principles of from outside to inside, from top to bottom, from front to back, and from the whole to the part.
In-depth remarks:
1. Fish: Animals such as carp and crucian carp, which have scales on their body surface, breathe with their fins, move with their fins, live in water all their lives, and reproduce with eggs are all fish.
2. Reptiles: Animals such as turtles, geckos, snakes and other animals that have scales or armor on the surface of their bodies, crawl on their abdomens, breathe with their lungs, and reproduce their offspring with eggs are all reptiles.
3. Amphibians: Animals such as frogs and toads have exposed body surfaces and reproduce with eggs. When they are young, they live in water and breathe with their lungs. When they grow up, they can live on land and in water and breathe with their lungs. , animals that use eggs to reproduce offspring are all amphibians.
Various animal PPT, Part 4 content: Classroom exercises
1. Fill in the blanks:
1. Animals like carp and crucian carp, which have (scales) on their body surface, use (gills) to breathe, use (fins) to move, live in (water) all their lives, and use (eggs) to reproduce their offspring, are all fish.
2. Animals such as turtles, geckos, and snakes, which have scales or armor on their body surface, slide on their abdomens against the ground, breathe with lungs, and reproduce with eggs, are all reptiles.
3. Like frogs and toads, the surface of the body is exposed, and they reproduce with (eggs). When they are young, they live in (water) and breathe with (gills). When they grow up, they can live in (water) and (on land). , use (lungs) to breathe, such animals are called (amphibians).
Second, short answer:
1. What are the common characteristics of fish?
Answer: Fish have scales on their body surface (a few species have no scales), breathe with gills, move with fins, reproduce with eggs, and live in water all their lives.
2. What are the common characteristics of amphibians?
Answer: The common characteristics of amphibians are that their body surfaces are exposed, they reproduce with eggs, and undergo metamorphosis. When they are young, they live in water and breathe with their gills; when they grow up, most of them live on land and breathe with their lungs.
3. What are the common characteristics of reptiles?
Answer: There are scales or armor on the surface of the body. The body crawls close to the ground, breathes with lungs, and reproduces offspring with eggs.
Keywords: Qingdao version third grade science PPT courseware for the second volume free download, various animal PPT downloads, .PPT format;
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