"Animal Reproduction and Development" PPT

Description

"Animal Reproduction and Development" PPT

Part One: Situation Import

Do you know insects?

1. Many species: World: estimated 10 million species, 1 million species have been named.

China: estimated to be 600,000 to 1 million species, 70,000 species have been named.

2. Large number of individuals: There can be 500,000 individuals in a nest of ants.

3. Long history: Appeared 350 million years ago.

4. Winged: Most have wings to expand their range of activities.

5. Small body: The body length of most insects is 5 ~ 30mm.

6. Body specialization: It has an exoskeleton and can adapt to complex environments.

learning target

1. Explain that the development of insects belongs to metamorphosis.

2. Understand the characteristics of the two developmental types of complete metamorphosis and incomplete metamorphosis.

3. Pay attention to the relationship between insects and humans and form a correct understanding of insects.

Animal Reproduction and Development PPT, Part 2: Course Exploration

Explore theme one

Insect reproduction and development

Do you know where beautiful butterflies come from?

Did you grow up as a butterfly?

1. Reproduction and development of locusts

(1) Reproductive method - sexual reproduction

(2) Development process - eggs, nymphs, adults

(3) Incomplete metamorphosis - The development process of locusts goes through three stages: egg, nymph, and adult. Such a development process is called incomplete metamorphosis. For example: praying mantis, cricket, cicada, cockroach, dragonfly, aphid, etc.

Thoughts and Discussions

1. What kind of reproductive method does silkworm reproduce? What are the characteristics of this reproductive method?

2. Based on daily observations, talk about other animals whose reproduction and development methods are similar to those of silkworms.

3. "The spring silkworms will not run out of silk until they die, and the wax torches will dry up when they turn to ashes and shed tears" (Li Shangyin of the Tang Dynasty). Analyzing from the perspective of the development process, what are the inaccuracies in this poem? Can you make it both scientific and artistic by changing two words?

2. Reproduction and development of silkworm

(1) Reproductive method - sexual reproduction

(2) Development process - eggs, larvae, pupae, adults

(3) Complete metamorphosis - the development process goes through four stages: egg, larvae, pupa and adult.

For example: flies, mosquitoes, bees, butterflies, ants, fleas, beetles, etc.

Explore theme two

Similarities and differences in the reproduction and development of locusts and silkworms

Same point

sexual development

Metamorphosis

difference

Incomplete metamorphosis, development through three stages: egg, nymph, and adult

Complete metamorphosis, development through four stages: egg, larva, pupa, and adult

Animal Reproduction and Development PPT, Part 3: Class Summary

1. Reproduction and development of locusts - incomplete metamorphosis

1. Definition - Ontogeny goes through the development process of egg, nymph, and adult.

2. For example: crickets, stink bugs, dragonflies, mantises, etc.

2. Reproduction and development of silkworm - complete metamorphosis

1. Definition - During the development process, it goes through four stages: egg, larva, pupa and adult. The morphological structure and life habits of the larva are significantly different from those of the adult. This development process is called complete metamorphosis.

2. For example: bees, cabbage butterflies, mosquitoes, flies, etc.

Animal Reproduction and Development PPT, Part 4: Standard Training

1. The cocoon represents the silkworm ( )

A. Egg stage B. Larva stage C. Pupa stage D. Adult stage

2. (2010·Suzhou Academic Examination) In the idiom "The golden cicada escapes its shell", "shell" refers to ( )

A. Exoskeleton B. Cuticle

C. Horny scales D. Cell wall

3. Incomplete metamorphosis and development process of locusts ( )

A. Egg → nymph → pupa → adult B. Egg → pupa → nymph → adult

C. Egg→nymph→adult D. Egg→pupa→adult

4． Jumping flies are the larvae of locusts. The essential difference between them and adults is ( )

A. Different morphological structures B. Different living habits

C. Larger body D. Reproductive organs are immature

Keywords: Beijing Normal University version of the eighth grade biology PPT courseware for the first volume free download, animal reproduction and development PPT download, .PPT format;

For more information about the "Reproduction and Development of Biological Reproduction and Development of Animals" PPT courseware, please click the Reproduction and Development of Biological Ppt ppt Reproduction and Development of Animals ppt tag.

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Update Time: 2024-11-03

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