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Authoritative PPT Summary
"Reproduction and Development of Amphibians" PPT
Part One: Independent Learning and Collaborative Exploration
1. During the breeding season, is it the male frog or the female frog that sings? What is the purpose of tweeting?
2. What kind of behavior does a male frog and a female frog embrace? What does it mean to hold on right?
3. Where does the female frog lay her eggs? Where do male frogs lay their sperm? In what environment are frog eggs fertilized? What is in vitro fertilization?
4. What processes does the development of a frog go through? What kind of development does it belong to?
5. Compare the differences between tadpoles and adult frogs (table)
6. What are the common characteristics of amphibian reproductive development?
1. "The fragrance of rice flowers means a good harvest, and you can listen to the sound of frogs." What kind of frog sounds is the sound of frogs? What does it do?
Male frog attracts female frog
The cuddling of male and female frogs is a reproductive behavior.
Increase in vitro fertilization rates
The way the fertilization process occurs outside the body is called in vitro fertilization.
Female frog releases eggs into water
Male frog releases sperm into water
The fertilization process takes place in water
Amphibian reproduction and development PPT, part 2: summary of key points
1. Name the reproductive process in amphibians.
Late spring and early summer is the breeding season for frogs. Male frogs chirp to attract female frogs. The male and female frogs discharge sperm and egg cells into the water respectively through _______. The sperm and egg cells combine in the water to form _______. Therefore, the reproductive characteristic of amphibians is _______.
2. Know the development process and characteristics of amphibians.
During the development of frogs, there are many differences in morphological structure and life habits between larvae and adults. The larvae live in water and breathe with ____; the adults can live in both water and wet land and mainly breathe with ____. Therefore, the development process of frogs is ________.
Amphibian Reproduction and Development PPT, Part 3: Basic Breakthrough
1. The ontogeny of frogs is ( ).
A. Egg→young frog→adult frog
B． Egg→tadpole→young frog→adult frog
C. Fertilized egg→young frog→adult frog
D. Fertilized egg→tadpole→young frog→adult frog
2. Frogs must live in a humid environment. The fundamental reason is ( ).
A. Reproduction and development are inseparable from water
B． Helps the skin complete assisted breathing
C. The venous and arterial blood of young frogs are partially mixed
D. The lungs are underdeveloped and have a simple structure
3. The reason why frogs are called amphibians is ( ).
A. Larvae can only live in water, adults live on land
B． Reproduce in water and develop on land
C. Larvae live in water, adults can live both on land and in water
D. Adults live amphibiously on land and water
Keywords: Jiangsu Education Edition eighth grade biology PPT courseware for the second volume free download, amphibian reproduction and development PPT download, .PPT format;
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"Reproduction and Development of Amphibians" PPT courseware:
"Reproduction and Development of Amphibians" PPT Courseware Part One: New Lesson Introduction In late spring and early summer, frogs croak, croak, croak one after another. What is the significance of frog calls? Can both female and male frogs sing? Learning Objectives 1. Describe the reproduction and development of amphibians..