"Reproduction and Development of Amphibians" Reproduction and Development of Biological Organisms PPT Courseware 5

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"Reproduction and Development of Amphibians" Reproduction and Development of Biological Organisms PPT Courseware 5

amphibian

The larvae live in water and use gills to breathe; the adults live amphibious lives, breathing with lungs and using skin to assist breathing. Such animals are called amphibians.

think

What kind of environment does the frog live in, and what are its morphological characteristics and living habits?

Can both female and male frogs sing?

What is the meaning of frog's croaking and hugging?

What are the similarities and differences between the development process of frogs and silkworms?

Amphibian reproductive development and environment

The reproduction and larval development of amphibians must take place in the water, and the larvae must undergo metamorphosis before they can live on land. Some people believe that this is one of the important reasons for the smaller distribution range and fewer species of amphibians.

Do you think this statement is correct?

Analyze reading materials and complete discussion questions

The above examples illustrate what impact environmental changes have on the reproduction of amphibians?

Deformed frogs appear in some areas. What may be the cause?

What lessons have you learned from the above examples?

Taking stock of harvest

Reproductive characteristics of amphibians: dioecy, in vitro fertilization

Developmental characteristics of amphibians: metamorphosis

The development process of frogs goes through four stages: fertilized egg, tadpole, young frog, and adult frog.

Frogs are "farmland guards" and good friends of crops. We should protect frogs and their living environment.

Use your brain

What does amphibian mean?

Are turtles, geese, and ducks amphibians?

Larvae live on _____ and breathe with _____; adults can live on _____ or on _____ and mainly breathe with _____. Amphibians are a transitional group from vertebrates to _____.

test you

1. Which of the following animals is not amphibians? ( ). �

A. Toad B. Salamander C. Turtle D. Giant salamander

2. The order of development of tadpoles is �( ). �

① Fertilized eggs ② Tadpoles with internal gills ③ Tadpoles with hind limbs ④ Tadpoles with forelimbs

⑤Tadpoles with external gills ⑥Young frogs ⑦Adult frogs

A. ①②③④⑤⑥⑦B. ①⑤②③④⑥⑦

C. ①③②④⑤⑥⑦D. ①④③②⑤⑥⑦

3. The starting point of frog ontogeny is �( ). �

A. tadpole B. egg

C. Young frog D. Fertilized egg

4. The reason why amphibians cannot become true terrestrial vertebrates is ().

A. Unsteady body temperature B. Underdeveloped lungs

C. Skin respiration D. Reproduction is inseparable from water

5. Before developing into young frogs, tadpoles use ( ) to breathe.

A. Internal gills B. External gills first and then internal gills

C. External gills D. Pulmonary respiration, skin-assisted respiration

6. Among frogs, the male frog is the one that can cry. It has a pair of singing sacs. The frog's cry of "croak, croak, croak" is �().

A. sing B. attract people’s attention

C. Show love to female frog D. Play

7. The characteristics of frog reproduction and development are (). �

A. Hermaphroditism, in vitro fertilization, in vitro development

B. Hermaphroditism, internal fertilization, external development

C. Dioecy, in vitro fertilization, in vitro development

D. Dioecy, internal fertilization, external development

8. The reproduction and development of frogs take place in �().

A. In water and on land B. In water

C. Proceed on land D. Proceed in mother body

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For more information about the PPT courseware "Reproduction and Development of Biological Reproduction and Development of Amphibians", please click the Reproduction and Development of Biological Things ppt Reproduction and Development of Amphibians ppt tag.

"Reproduction and Development of Amphibians" Biological Reproduction and Development PPT Courseware 6:

"Reproduction and Development of Amphibians" Reproduction and Development of Organisms PPT Courseware 6 Amphibians contain two meanings: First, from the perspective of the evolutionary history of vertebrates, amphibians are a group that transitioned from aquatic to terrestrial. The second is from the individual findings of amphibians...

"Reproduction and Development of Amphibians" Biological Reproduction and Development PPT Courseware 4:

"Reproduction and Development of Amphibians" Biological Reproduction and Development PPT Courseware 4 Questions before class 1. What stages does the development process of silkworm go through? 2. What are the similarities and differences in the external morphology of silkworm larvae and adults? 3. What stages does a locust go through in its development process? 4..

"Reproduction and Development of Amphibians" Biological Reproduction and Development PPT Courseware 3:

"Reproduction and Development of Amphibians" Reproduction and Development of Organisms PPT Courseware 3 What kind of animals are called amphibians? Frogs, toads, giant salamanders and newts, etc. The larvae live in the water and breathe with gills; the adults mostly live on land. Go up, breathe with your lungs, and use your skin at the same time...

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Update Time: 2024-11-21

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 2 industry PPT template

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