"The Life Cycle of Silkworms" Animal Life Cycle PPT Courseware 3

Description

"The Life Cycle of Silkworms" Animal Life Cycle PPT Courseware 3

What are we going to do in this lesson?

Animals have life cycles, we need to understand them.

Different animals have different shapes, changes, and reproduction methods during their growth process, and their life spans are also different. We also need to know this.

The life cycle time is the lifespan of the animal.

Changes in living environment factors such as climate, food, and enemies will have a greater impact on the lifespan of animals.

summary:

1. Animals go through growth periods such as birth, growth and development, reproduction, and death throughout their lives, which constitute the animal's life cycle.

2. The fundamental meaning of the recurring life cycle is to pass life from generation to generation and ensure the continuation of life.

The life cycle of animals goes through:

Birth - Growth and Development - Reproduction - Death

But what are the similarities and differences in the life cycles that animals go through?

Some animals change greatly throughout their lives, while others change little.

Different animals have different life cycles

Knowledge: Metamorphosis

Some animals look very different in their infancy and adulthood, changing from one form to another. This change is called metamorphosis.

Note: Many animals in nature undergo metamorphosis throughout their lives. For example, toads, do you know any other animals that undergo metamorphosis in their life cycle?

What is the biggest difference in their life cycles?

Chickens hatch from eggs. Simply put, they are oviparous.

Sheep are born directly from their mothers, which is simply called viviparous.

Let's classify animals according to this

think:

1. What stages do silkworms, pandas, flies and other animals go through in their lives?

Answer: They all go through growth periods such as birth, growth and development, reproduction, and death.

2. Why do animal species not become extinct as individuals age and die?

Answer: Because when animals grow to a certain period, they will reproduce through reproduction.

Summary

Various animals have their own life cycle, including birth, growth and development, reproduction and death.

The stages that different animals go through in their life cycles are not necessarily the same, nor are the lengths of the cycles.

Some animals undergo metamorphosis throughout their lives, while others remain unchanged in form but change in size.

Some animals hatch from eggs (oviparous), and some are born directly from their mothers (viviparous).

Operation

Reading textbook P39: Metamorphosis of insects

Provide study guidance

Preview Lesson 7 Our Life Cycle.

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"The Life Cycle of Silkworms" Animal Life Cycle PPT Download:

"The Life Cycle of Silkworms" PPT Download of Animal Life Cycles Part One: Introduction of New Knowledge Looking back at our silkworm raising process, think about the life of silkworms, what processes have they gone through? ... ... ... The life cycle of silkworms PPT, part 2: new knowledge explanation 1..

"The Life Cycle of Silkworms" Animal Life Cycle PPT:

"Life Cycle of Silkworms" Animal Life Cycle PPT Part One: Summary of the Life of Silkworms Review our silkworm raising process and organize our observation records. How many stages does a silkworm go through in its life? What are the differences in form and behavior among the various stages? A silkworm's life is...

"The Life Cycle of Silkworms" Animal Life Cycle PPT Courseware 2:

"Life Cycle of Silkworms" Animal Life Cycle PPT Courseware 2 Moths and silkworm eggs hatch into silkworms and turn into pupae and moths, repeatedly completing the cycle of new generations. This is the life history of silkworms. The color of silkworm eggs is light yellow or yellow when first laid. It turns into light red bean color or red bean color after 1 to 2 days, and then after 3...

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Update Time: 2024-09-24

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

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