"Amphibians and Reptiles" PPT courseware on the main groups of animals

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"Amphibians and Reptiles" PPT courseware on the main groups of animals

1. Amphibians

Think about it, discuss it

Frogs and turtles can live in both water and land. However, frogs are amphibians and turtles are reptiles. Why is this?

1. The development process of frogs

Fertilized egg - tadpole with external gills - tadpole with external gills missing - tadpole with hind limbs growing - tadpole with limbs growing - young frog - adult frog

(1) Reproduction and development: Fertilization in water and development into tadpoles in water

(2) Living environment:

a. Larvae live in water, and most adults live on land and can also swim in water;

b. Live in green environments such as rice fields and ponds.

Observe and think

Discussion 1:

What color is the body surface?

What does this have to do with its living environment?

(1) The green surface of the frog’s body is consistent with the surrounding green plants;

(2) It is beneficial to protect yourself and capture food.

Discussion 2:

How do you feel when you hold a frog in your hand?

why is that?

The skin is exposed and can secrete mucus

Discussion 3:

Compare the morphological differences between the forelimbs and hindlimbs of frogs and think about it, what does this have to do with the functions of the forelimbs and hindlimbs?

(1) The forelimbs are short and can support the body;

(2) The hind limbs are well developed and have webs between the toes, which are convenient for jumping and paddling.

3. Main characteristics of amphibians

1. Larvae live in water and breathe with gills

2. Most adults live on land, but can also swim in water, breathe with their lungs, and their skin can assist breathing.

Emphasis: The characteristics of amphibians cannot be simply understood as being able to live in both water and land! ! !

For example: ducks can also live in water and on land, but they are birds.

2. Reptiles

Reptiles are true terrestrial vertebrates that are fully capable of adapting to life on land. However, the lives of fish and amphibians still cannot be separated from the constraints of water. Mainly manifested in respiratory, reproductive and other aspects.

1. Body structure, respiration and reproduction of lizards

3. Main characteristics of reptiles

A. Scales or nails covering the body surface

B. Breathe with your lungs

C. Lay eggs on land, with a tough shell on the surface of the eggs

4. The relationship between reptiles and human life:

Turtle - edible

Snake - medicinal

Refuge (Chameleon) - Prey on pests

Dinosaurs - once dominated the earth but have become extinct

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"Amphibians and Reptiles" Main Groups of Animals PPT Courseware 5:

"Amphibians and Reptiles" Main Groups of Animals PPT Courseware 5 Think about it and discuss it Frogs and turtles can live in both water and land. However, frogs are amphibians and turtles are reptiles. Why is this? What is the representative animal of amphibians? ..

"Amphibians and Reptiles" Main Groups of Animals PPT Courseware 4:

"Amphibians and Reptiles" Main Groups of Animals PPT Courseware 4 1. Amphibians 1. Representative animal frog: Fill in the names of each part of the frog: (1) Development of the frog. ①Tadpoles: have tails, breathe with ___, and can only live in _____. ②Frog:_______..

"Amphibians and Reptiles" Main Groups of Animals PPT Courseware 3:

"Amphibians and Reptiles" Main Groups of Animals PPT Courseware 3 What does amphibian mean in amphibians? The larvae live in water and breathe with gills. The adults live on land and breathe with lungs. 1. Observation and exploration. Take a look: 1. Observe the frog's body shape, color, green...

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Update Time: 2024-11-25

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

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