"Animal Reproduction and Development" PPT courseware

"Animal Reproduction and Development" PPT courseware

Part One: Learning Objectives

1. Understand the development process of amphibians, birds and other animals, and describe the characteristics of different developmental stages of frogs, chickens and other animals.

2. Cultivate the ability of observation and analysis through experiments, diagrams, etc.

3. Understand the relationship between normal animal development and the environment; realize that protecting the environment is closely related to animal reproduction and offspring.

Animal Reproduction and Development PPT, Part 2: Course Exploration

Explore theme one

Amphibian reproduction and development

What is the significance of the frog's croaking?

frog hug

Hug it right

It is conducive to the direct discharge of semen on the eggs, which will increase the fertilization rate of the eggs.

discuss

1. What are the main developmental stages that frogs go through during reproduction and development?

2. What is the fertilization method of frogs?

After cuddling, the female frog releases eggs into the water, and the male frog also releases sperm into the water. The egg cells and sperm complete fertilization in the water. This fertilization method is in vitro fertilization.

3. Why is the development of frog also called metamorphosis?

During the development process from larvae to adults, frogs have significant changes in their living habits and morphological structure.

Explore theme two

General processes of reproduction and development in birds

Observe the structure of chicken eggs

First use a magnifying glass to observe the egg shell, then gently tap the blunt end of the egg to make cracks, and use tweezers to remove the broken egg shell together with the shell membrane to see if there is a small cavity underneath the egg shell. Then use scissors to cut the inner shell membrane under the small cavity, so that the egg white and yolk in the shell membrane flow into the petri dish. Observe the structure of the egg according to the chicken egg structure diagram, and pay attention to whether there are any small white spots on the yolk.

think

Some people say that the egg shell is the cell wall, the egg shell membrane is the cell membrane, the yolk is the cell nucleus, and an egg is a cell. Is that true? Why?

Unfertilized egg (egg cell)

Cell membrane: (vitelline membrane)

Cytoplasm: (yolk)

Nucleus: (located in the blastoderm)

Animal Reproduction and Development PPT, Part 3: Standard Training

1. The reproductive method of frogs is ( )

A. In vitro fertilization, viviparous B. In vitro fertilization, metamorphosis

C. Internal fertilization, egg laying D. internal fertilization, metamorphosis

2. "Butterflies can be seen deeply through flowers", "frogs are everywhere in green grass ponds". The similarities in reproduction and development between the butterfly and the frog described in the poem are ( )

A. Asexual reproduction, metamorphosis B. Sexual reproduction, no abnormal development

C. Sexual reproduction, metamorphosis D. Asexual reproduction, no metamorphosis

3. What in bird eggs can provide nutrients for embryonic development ( )

A. Yolk B. Egg white

C. Yolk and egg white D. Yolk and blastoderm

4. The part in the bird egg where the embryo develops is ( )

A. Blastoderm B. Yolk C. Egg white D. Air cell

5. Which of the following is not a general process of bird reproduction and development ( )

A. Courtship B. Nesting C. Mating D. Food storage

Keywords: Beijing Normal University version of the eighth grade biology PPT courseware for the first volume free download, animal reproduction and development PPT download, .PPT format;

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

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