"The Growth Period of Animals" PPT courseware

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"The Growth Period of Animals" PPT courseware

Part One: Animal Classification

What are the five categories of animals from lower to higher?

Fish, amphibians, reptiles, birds, mammals

What is an animal whose larvae are in water and adults are on land?

Amphibians

1. Please fill in the corresponding empty boxes with the names of frogs in different growth stages according to the order of growth and development of frogs.

2. Use your existing knowledge to fill in the main differences between tadpoles and adult frogs.

During the development process from larvae to adults, great changes will occur in lifestyle and morphological structure. This is one of the common characteristics of amphibians such as frogs, toads, and salamanders.

Animal growth period PPT, part 2 content: thinking

1. What stages do humans, frogs, silkworms and locusts go through in their lives?

Animals go through _____, _____, _____, _____ and other growth periods throughout their lives. These growth periods constitute the animal's life cycle.

2. What stages do frogs and silkworms go through in their lives? What are the common characteristics?

Answer: They experience fertilized eggs, larvae and adults together; their common feature is that their larvae and adults often have major changes in morphology and lifestyle.

Animal growth period PPT, part 3 content: Consolidation exercises:

1. The reason why the human race can continue is that there are ( ) in the human life cycle

A. Birth B. Growth and development C. Reproduction D. Death

2. Have you ever watched Dragonfly Dianshui? Do you know what it is doing at this time?

3. Frogs belong to ()

A. Fish B. Amphibians C. Jumping species and reptiles

Animal growth period PPT, part 4 content: thinking and discussion:

1. In what environment do fertilized eggs formed by animals undergoing in vitro fertilization generally develop?

2. Which of these two methods of fertilization is superior? (It helps to increase the probability of fertilization)

3. In animals with internal fertilization, does the development of the embryo occur inside the mother’s body?

Thinking: 1. Are insects, fish, amphibians, reptiles, birds, and mammals oviparous or viviparous?

2. In addition to oviparous and viviparous, are there other types of embryonic development?

3. What are the differences between the three modes of embryonic development: ovoviviparous and viviparous and ovoviviparous?

discuss:

1. The eggs of oviparous animals are much larger than those of viviparous animals. What does this mean for embryonic development?

The nutrients required by oviparous animals come from the yolk of the egg cell

2. What significance do viviparous and lactation have on the reproduction of mammals?

Tell me why.

Viviparity and lactation greatly increase the survival rate of the next generation

Advantages of viviparous birth: warmth, safety, nutrition and oxygen guarantee

Advantages of breastfeeding: Breast milk is rich in nutrients and disease-fighting substances.

Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume free download, animal growth period PPT download, .PPT format;

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"Growth Period of Animals" PPT:

"Growth Period of Animals" PPT Part One Content: Animal Reproduction Methods Sexual reproduction: The reproductive method that combines sperm and egg cells to form fertilized eggs to produce new individuals. Asexual reproduction: It does not require the combination of sperm and eggs and is produced directly from a mother. New...

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Update Time: 2024-11-21

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 2 industry PPT template

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