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

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"Reproduction and Development of Birds" 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.

Blastoderm - contains the nucleus and is the site of embryonic development.

Air chamber - stores air and supplies the oxygen needed for embryonic development.

Tie - suspends the yolk, fixes and absorbs shock, and facilitates hatching.

Yolk - stores nutrients needed for embryonic development and is the main nutritional part of the egg cell.

Apply what you learn

1. Some people say that an egg is just an egg cell, right?

2. Can all eggs hatch into chicks? If you were the director of a chicken hatchery, what kind of eggs should you choose?

3. If the egg shell of an egg is completely coated with glue, can a chick be hatched?

4. What structures of eggs are suitable for life on land?

1. Is an egg an egg cell?

The blastoderm, yolk, and vitelline membrane constitute an egg cell. The blastoderm contains the nucleus of the egg cell, the yolk is the cytoplasm of the egg cell, and the vitelline membrane is the cell membrane of the egg cell.

tips:

There are about 7,000 pores on an egg shell. Contaminated eggs cannot hatch chicks because the dirt blocks the pores in the eggshell and prevents the embryo from breathing. The reason why eggs cannot be washed with water is because there is a film of solidified mucus on the outside of the eggshell. Washing with water will destroy this protective film, and bacteria will take advantage of it and cause the eggs to spoil.

Experimental inquiry: Can you conduct any experiments to prove the existence of stomata?

2. Development of birds

Does a bird's fertilized egg begin to develop after it is laid?

If the bird's egg cell has been fertilized, the fertilized egg has already begun to develop in the female bird's body, so it will already be a small embryo when it is produced.

1. What role does the nest play in the reproduction and development of birds?

(1) The bird's nest keeps the eggs in a pile and prevents them from rolling away, making it easier for the parent birds to hold them and hatch them.

(2) The bird's nest is conducive to maintaining a relatively constant temperature and humidity, reducing the impact of adverse climate, and is conducive to the development of embryos in eggs.

(3) In addition to early adult birds, the nest is also the place where young birds live and where they receive feeding from their parent birds.

(4) Bird nests are conducive to the safety of eggs and chicks.

2. A female toad can lay up to 10,000 eggs per year, while a female bird can only lay a few eggs per year. why?

answer. Toads are fertilized in vitro, oviparously, and the fertilization process and early development of larvae are mostly carried out in water, resulting in low fertilization rate, low hatching rate, and low survival rate; birds are fertilized internally and lay large eggs with hard shells, and the eggs are rich in nutrients. Substances, and pro-bird nesting, egg-incubation and brood-raising behaviors, all of which make birds have high fertilization rates, high egg hatching rates, and high survival rates.

Basic pass

1. The nutrients required for the development of bird embryos come from bird eggs ( )

A. Egg white B. Egg yolk c. blastoderm D. Yolk and egg white

2. The function of the peacock spreading its tail is ( ).

A. For tourists to enjoy B. Courtship

C. Show off to someone of the same sex D. demonstrate against the enemy

3. Birds are more complex and advanced than insects and amphibians, and their reproduction performance is ( ).

A. Building nests, incubating eggs, and raising chicks B. oviparous

C. Viviparous, lactation D. in vitro fertilization

4． Birds can produce offspring with higher survival rates. What is not directly related to the high survival rate of bird offspring is ( ).

A. Internal fertilization b. incubation behavior

C. Brooding behavior D. dioecious

5. Eggs laid by hens in chicken farms cannot hatch chicks. The reason may be ( ).

A. Eggs are too small b. Eggs store too few nutrients C. Eggs are not fertilized D. Too little air stored in the egg

6. Among the following items, the stages that all birds must go through during reproduction and development are ( ).

A. Mating b. Nesting c. Hatching eggs D. Brooding

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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 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...

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

"Bird Reproduction and Development" Biological Reproduction and Development PPT Courseware 3 Premature bird chicks are fully developed when they hatch. They have dense down feathers, their eyes have been opened, and their legs and feet are strong. After the down feathers dry, they can Parent birds looking for food. Most ground-dwelling birds (such as chickens) and nomadic birds (ducks)..

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Update Time: 2024-11-18

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

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