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Authoritative PPT Summary
Hunan Education Edition 4th Grade Science Volume 2, PPT about Pianpian Female and Male
Part One: The Definition of Reproduction
reproduce
Reproduction means that organisms create individuals of the same kind through the production of children or eggs/ovulation, so that the species can continue to exist.
There are two main ways for animals to reproduce the next generation:
1. [Oviparous reproduction] ---- animals reproduce the next generation by laying eggs or laying eggs
2.【Viviparous Reproduction】----Animals give birth to babies directly within the mother’s body
Pianpian Female and Male PPT, Part 2: Various stages of embryonic development in eggs
The first picture shows the fertilized egg stage: focus on the small white dots on the yolk. This is the blastoderm of the egg, which is formed by the division of the fertilized egg and is the site of embryonic development.
The second to fourth pictures are the stages of embryonic development. During this period, the embryos continue to divide and develop into young individuals. The body structure gradually forms, and the beak and feathers gradually grow.
The fifth picture shows the birth stage. The mature chick pecks open the eggshell with its immature beak and leaps out.
The chick that emerges from the egg in the last picture has dried its feathers and can start walking around in search of food.
Watch the eggs:
From the outside to the inside, break the egg and observe it inside the glass dish.
Fertilized egg stage: small white dots on the yolk, placenta
Stages of embryonic development: the embryo develops to give birth to a chick,
The egg's oval shape can withstand greater pressure. There are small holes in the eggshell for ventilation. There are two layers of egg shell membrane inside the egg shell, which can protect the egg cells. The egg is larger at one end and smaller at the other. At one end of the large end of the egg, the eggshell membrane separates to form an air chamber, which supplies the oxygen needed for embryonic development.
The embryo of an egg is composed of egg white, yolk and blastoderm. Egg whites can protect egg cells and provide water and nutrients needed for embryonic development. The yolk stores nutrients for the development of the embryo.
What are the functions of each part of the egg?
Eggshell: breathable, protects the embryo
Eggshell membrane (two layers): protects the embryo.
Air chamber: Provides oxygen directly to the embryo.
Egg yolk (egg yolk): Provides nutrients directly to the embryo.
Ovalbumin (Egg White): Protects the embryo, acts as a buffer, and provides the protein and moisture the embryo needs as it grows.
Blastoderm: develops into chick
Pian Pian female and male PPT, the third part: summary and practice
There are two main ways for animals to reproduce the next generation:
oviparous reproduction
viviparous reproduction
1: The baby will be born after it matures in the mother's ( ).
A. Yolk B. Uterus C. Ovary
2: The largest cell in the human body is ( ).
A. Mature egg cells
B. Nerve cells
C. red blood cells
D. white blood cells
3: In chicken eggs, the structure included in the real egg cell is ( ).
A. Blastoderm, nucleus
B. Yolk, egg white and inner egg shell membrane
C. Blastoderm, yolk and vitelline membrane tightly wrapped around the yolk
D. Whole chicken egg
4: The most important part of the structure of bird eggs is ( ).
A. Yolk B. Egg white C. Blastoderm D. Egg shell
Keywords: Hunan Education Edition fourth grade science PPT free download, PPT download of Pian Pian female and male, .PPT format;
For more information about the PPT courseware "Pian Pian Female and Male", please click on the PPT tab of Pian Pian Female and Male.
Download PPT of "Placent Female and Male":
Hunan Education Edition, Fourth Grade Science, Volume 2, PPT download of Pianpian Female and Male. The first part: Observing chicken eggs. Materials and tools: fresh eggs, petri dishes, tweezers, magnifying glass, etc. Experimental steps: 1. Look at the shape 2. Use a magnifying glass to observe the eggshell 3. Observe the internal structure of the egg..
PPT courseware of "Pandian Female and Male":
Hunan Education Edition, fourth grade science in the second volume, PPT courseware of Pian Pian female and male. The first part of the content: independent introduction. There are flying swallows on the beam, Pian Pian female and male. Between the two rafters holding mud, four children are born in a nest. Bai Juyi's "Poetry of Yan to Liu Sou" How are chicks born? Oviparous: To lay eggs..