"Reproduction and Development of Birds" Reproduction and Development of Biological Organisms PPT Courseware

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"Reproduction and Development of Birds" Reproduction and Development of Biological Organisms PPT Courseware

structure of bird eggs

Egg shell: There are pores on it to allow gas exchange and protect the internal structure.

Eggshell membrane: protects egg white and yolk

Egg white: rich in nutrients and water, needed for embryonic development

Yolk: The main nutritional part of the egg cell, providing nutrients for embryonic development

Blastoderm: small white dots in the yolk, containing the nucleus. The blastoderm of unfertilized eggs is light and small, while the blastoderm of fertilized eggs is thick and slightly larger.

Vitelline membrane: protects the yolk

Air chamber: Provides oxygen for embryonic development

Frenulum: fixes the yolk

Characteristics of bird eggs suitable for life on land

1. The egg shell and egg shell membrane have a protective effect

2. The air chambers and stomata provide oxygen for embryonic development

3. Egg white provides a water environment for embryonic development

4. Egg yolk provides nutrients needed by the embryo in the early stages of development.

early bird

1.Open your eyes

2. There is dense villi all over the body

3. Strong legs and feet

4. Find food on your own

late blooming bird

1. The eyes are not opened.

2. There is very little fluff on the body.

3. Weakness of legs and feet.

4. Fed by parent birds

1. In the fertilized eggs of domestic pigeons, the part that will develop into young pigeons is

A yolk B blastoderm C egg white D frenulum

2. Strictly speaking, the eggs laid by hens after mating should be one

A egg cell B fertilized egg C multicellular embryo D chick

3. To determine whether a bird egg is fertilized, mainly observe its blastoderm and the blastoderm of the fertilized egg.

A is a light color and small B is a dense and large color C is a light and large color D is a dense and small color

4. The main function of the air chamber is

A provides oxygen for embryonic development B makes bird eggs relatively lighter

C is beneficial to the balance of bird eggs D can slow down the oscillation of the central yolk

5. The eggs that people usually eat are

A fertilized egg B unfertilized egg

C may be a fertilized egg or an unfertilized egg

D embryo has developed egg

6. Bird reproductive development goes through multiple stages. For a kind of bird, the stages that the parent bird itself must go through are:

A build a nest B hatch eggs C brood D lay eggs

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

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

"Bird Reproduction and Development" Biological Reproduction and Development PPT Courseware 6 What is the role of the structure of each part of the egg? Protein has a protective effect and can also provide nutrients and water needed for embryonic development. The blastoderm contains the nucleus, the site of embryonic development. The air chamber stores air..

"Reproduction and Development of Birds" Biological Reproduction and Development PPT Courseware 5:

"Bird Reproduction and Development" Biological Reproduction and Development PPT Courseware 5 Teaching Objectives 1. Name the structural characteristics of bird eggs that are suitable for development on land. 2. Describe the reproductive and developmental processes of birds. 3. Pay attention to the relationship between birds and human life by visiting or participating in poultry breeding activities.

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

"Reproduction and Development of Birds" Reproduction and Development of Biological Organisms PPT Courseware 4 1. Observe the structure of bird eggs, ask questions and communicate. You may have raised chickens, ducks or domestic pigeons, or you may have seen about the reproduction and development of birds on TV. situation. Regarding the reproduction and development of birds, you...

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Update Time: 2024-11-24

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

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