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Authoritative PPT Summary
"Animal Eggs" New Life PPT Courseware 2
I find:
Differences: The size, color, number and spots of eggs of different animals are different.
Similarities: Egg (egg) shells are all oval.
Observe the most common egg - the egg
1. Observe the outside of the egg (use a magnifying glass and flashlight).
2. Observe the internal structure of the egg and draw a simple diagram. (In order from outside to inside)
3. Guess the function of each part of the egg.
Steps to peel eggs:
First use the handle end of the tweezers to crack the rounder end of the egg shell;
Then use tweezers to start peeling off the eggshell;
Finally, break off the egg whites to expose the yolks.
(Try to keep the yolk intact.)
I see:
(Fertilized) raw eggs are composed of shell, egg blue, egg yolk, and embryo. Unfertilized eggs have no embryo, so they cannot hatch chicks.
The protein of cooked eggs is what we often call (egg blue), and the small white dots on it are (embryos), which are formed by the division of fertilized eggs and are the parts that carry out embryonic development.
For the egg composition of other animals, we call it egg shell, egg white, yolk and embryo.
Speculation discussion:
Can I guess what role each part of the egg plays in embryonic development?
Observation record of frog egg hatching
Day 2
The frog eggs swell, and the small black dot in the middle of the egg becomes a long strip, with the middle slightly protruding and occasionally moving.
Day 4
The egg whites are mixed together and floating in the middle of the water. There are many tadpoles on it. The tadpoles are about 0.6 cm long, with a gray-black body and a light yellow belly.
Day 6
The head becomes larger and more flexible, and the tadpoles' heads gather together in one direction.
Day 8
The body is transparent, the head becomes round, and I sleep with my stomach turned over
…
The body grows long, and there is something like cartilage in the middle of the tail.
scientific concept
The way frogs and chickens reproduce their offspring is called oviparous reproduction.
Animals that reproduce by eggs are called oviparous animals.
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"Animal Egg" New Life PPT Download:
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"Animal Egg" New Life PPT:
"Animal Eggs" New Life PPT Part One: Animal Eggs Collect eggs of various animals and observe their similarities and differences. Butterfly eggs Frog eggs Toad eggs Fish eggs Eggs of various birds Use a magnifying glass to observe the outside of the egg, we will find...
"Animal Eggs" New Life PPT Courseware 3:
"Animal Eggs" New Life PPT Courseware 3 The functions of various parts inside the egg A. Proteins provide nutrients and moisture. B. Egg yolk provides nutrients. C. The embryo develops into a chick. D． The air chamber provides oxygen. E. The eggshell protects the embryo inside the egg. ....