"Reproduction and Development of Birds" PPT

Description

"Reproduction and Development of Birds" PPT

Part One: Objectives of this section:

1. Describe the reproductive and developmental processes of birds

2. List the common early birds and late birds

How to observe eggs

1. Crack the blunt end of the egg to make cracks.

2. Use tweezers to remove the egg shell and outer egg shell membrane.

3. Cut the inner shell membrane with scissors.

4. Pour the egg white and egg yolk into the petri dish together.

5. Comparative observation.

Part 2: Functions of each part

What are the functions of the egg shell, egg white and yolk, egg belt, and air chamber?

egg shell

Protect internal materials and exchange materials (there are many pores on the egg shell for ventilation)

Egg white and yolk (vitelline membrane outside)

Provide nutrients for the development of chicken embryos

egg belt

Fixed embryo position

Air chamber

Stores air to provide oxygen for embryonic development

Part Three: Classroom Thoughts

Think: Do all birds go through this period?

Answer: No

Some birds, such as cuckoos, do not build nests, incubate eggs, or raise chicks. Instead, they lay their eggs in the nests of other birds and let these birds incubate their eggs and raise their chicks.

What kind of scene is being described?

1. Several early orioles compete for warmth in the trees, but whose spring swallows peck at the spring mud and build their nests?

2. Going back and forth for a while, as if there is a fear of starvation in the nest.

3. There are two swallows on the beam, the male and female are mating gracefully.

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware for the second volume free download, bird reproduction and development PPT download, .PPT format;

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"Reproduction and Development of Birds" PPT courseware:

"The Reproduction and Development of Birds" PPT Courseware Part One: New Lesson Introduction The poet Bai Juyi mentioned in "Spring Journey to Qiantang Lake" that several early warblers competed for the warm trees, and whose new swallows pecked at the spring mud. , what reproductive behavior of birds does he describe? What are the implications? Please share your...

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Update Time: 2024-10-05

This template belongs to biology courseware Jiangsu Education Edition 8th Grade Biology Volume 2 industry PPT template

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