"Animal Reproduction Activities" New Life PPT Download

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"Animal Reproduction Activities" New Life PPT Download

Part One: New Knowledge Explanation

1. Reproductive activities of oviparous animals

Courtship

mating

nest

spawning

hatchery

Brooding

Many of the activities of animals are in preparation for reproduction

Courtship → Mating → Nest building → Egg laying → Egg incubation → Brooding

2. Plant reproduction

The stamens of plants are divided into ________ and ________. The ________ produced by the stamens travels to the stigma of the pistil, fertilizing the ovules in the ovary. The fertilized ________ develops and forms a seed.

3. Reproduction of viviparous animals

The way cats, dogs, rabbits, etc. reproduce their offspring is called _______.

Animals that reproduce viviparously are called ______________.

Animal Reproductive Activities PPT, Part 2: Knowledge Expansion

What are the ways of animal reproduction?

1. Oviparous

2.Viviparous

3. Ovoviviparous

Some species of sharks, as well as some fish, and various reptiles (basilisks, salamanders, and Alpine lizards) all give birth directly to their offspring. Compared with mammals, they do not simply stay in the uterus and receive nutrients from the placenta. Instead, they develop in the egg, grow on the nutrients in the egg, and then slide into the uterus before finally being born. This is the so-called ovoviviparous birth. . For cone-toothed sharks, the time between sliding into the uterus and giving birth is a little longer.

Animal Reproductive Activities PPT, Part 3: Consolidation Practice

1. Judgment

1. Nesting, incubation, and brood raising of birds are all related to reproduction. ( )

2. Human beings also use viviparous and lactating methods to give birth and nurture offspring. ( )

3. Oviparous animals are all cold-blooded animals, while viviparous and lactating animals are all endotherms. ( )

2. Fill in the blanks

1. The method of reproducing offspring like frogs, chickens, etc. is called ( ), and animals that reproduce by eggs are called ( ).

2. The method of reproducing offspring like cats, dogs, rabbits, etc. is called ( ), and animals that reproduce through viviparous reproduction are called ( ).

3. Eggs laid by female animals can develop into new life only after they are combined with the ( ) of male animals.

Animal Reproductive Activities PPT, Part 4: Class Summary

What did you learn in this lesson?

1. Animal reproduction involves many activities, such as courtship, mating, nest building, egg laying, egg incubation, brood raising, etc.

2. When the eggs of female animals and the sperm of male animals combine to form fertilized eggs, new life can begin.

3. Animals reproduce in various ways, most of which are oviparous. Such animals are called oviparous animals. The reproductive method of directly giving birth to small animals and nurturing them with milk is called viviparous.

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Update Time: 2024-11-18

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

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