"Animal Reproduction" New Life PPT Courseware

Description

"Animal Reproduction" New Life PPT Courseware

The reproduction method like dragonflies is called oviparous, and animals that reproduce by laying eggs are called oviparous animals.

Eggs laid by female animals can only develop into new life after being combined with the sperm of male animals.

Like puppies, the fertilized egg is gestated in the mother's body. After a period of growth and development, the fetus is born directly from the mother's body. This method of reproduction is called viviparous. Animals that reproduce by giving birth are called viviparous animals.

Suggestions for after-school development activities:

1. Understand yourself – where did I come from?

2. Investigate other methods of animal reproduction.

3. Read Section 9 of Fabre's "Insects" "The Emergence of the Cricket"

Animal reproductive behavior—the behavior of insects protecting their eggs

Parent insect protects eggs

After most insects lay their eggs, they no longer have any interaction with the eggs, but some insects will take care of and protect the eggs themselves by their parent insects!

Egg protection cover

Some adult moths or butterflies have long hairs on the end of their abdomen. When they lay eggs, they attach the hairs to the eggs to form a protective shield. In addition, mantises and locusts secrete a foamy gel to cover the eggs. When the gel hardens, it will also become a protective shield for the eggs.

Egg protection---sticking to parents

The female worm lays her eggs on the male's back, and the male holds them until they hatch.

Seahorses The female seahorse lays her eggs in a brood pouch on the male's abdomen until the calves hatch.

Shrimps and crabs: Female shrimps and crabs use their special feet to place eggs under their bodies for protection until they hatch.

Tilapia females will hold the egg masses in their mouths to hatch them and take care of them until they can live independently.

Animal reproductive behavior--methods of fertilization

in vitro fertilization

1. Target: Most fish and amphibians.

2. Process: The sperm and eggs are released from the parents into the water and then combined. This kind of fertilization outside the body depends entirely on chance, so the probability of successful fertilization is low.

3. Characteristics: Male and female individuals need to produce a large number of sperm and eggs, and the time and place of releasing sperm or eggs need to be as consistent as possible.

body fertilization

1. Target: Most terrestrial animals.

2. Process: Male animals need to mate, send sperm into the female body, and meet the eggs to complete fertilization. The success rate of fertilization is greater than that of in vitro fertilization.

3. Features: No need to produce large amounts of sperm and eggs.

Keywords: New life teaching courseware, Animal Reproduction teaching courseware, Educational Science Edition fourth grade science PPT courseware download, Volume 2, Fourth grade science slide courseware download, New Life PPT courseware download, Animal Reproduction PPT courseware download, .PPT Format;

For more information about the "New Life Animal Reproduction" PPT courseware, please click the "New Life ppt Animal Reproduction ppt" tab.

"Animal Reproduction Activities" New Life PPT Download:

"Reproductive Activities of Animals" New Life PPT Download Part One Content: New Knowledge Explanation 1. Reproductive Activities of Oviparous Animals Courtship, Mating, Building Nests, Laying Eggs, Hatching, and Brooding Many activities of animals are to prepare for reproduction. Courtship, mating, building nests, laying eggs, hatching, and brooding. two,..

"Animal Reproductive Activities" New Life PPT:

"Animal Reproductive Activities" New Life PPT Part One: Reproductive Activities of Oviparous Animals Many animals reproduce by laying eggs. Many of the activities of animals are in preparation for reproduction. The stamens of plants are divided into stamens and pistils. Flowers produced by stamens..

"Animal Reproduction" PPT courseware:

"Animal Reproduction" PPT Courseware The Concept and Significance of Reproduction Reproduction means that animals create individuals of the same kind by giving birth to babies or laying eggs so that the species can continue to exist. Butterflies reproduce the next generation by laying eggs. What other animals are similar to butterflies?

File Info

Update Time: 2024-11-14

This template belongs to science courseware Fourth Grade Science Volume 2, Textbook Edition industry PPT template

Preview