"Flying Elf" Various Animals PPT Courseware 2

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"Flying Elf" Various Animals PPT Courseware 2

Why can birds fly freely?

Because it has wings.

Are all birds with wings?

What animals can the students name that can fly but are not birds?

Discussion and exchange: What are the characteristics of the wings of the three animals?

The wings of a bat are composed of membranes between the forelimbs, hindlimbs, and tail, and there are no feathers on the body surface.

Pigeon wings: large in area, the right feathers form a densely structured plane, and there are dense down feathers underneath.

Dragonfly wings: long and narrow, membranous, equal lengths of front and rear wings, no feathers on the body surface.

The secret of feathers:

Feathers are unique to birds, are slightly elastic and waterproof, and have functions such as body protection, heat preservation, and flight. Feathers are usually divided into three types: straight feathers, down feathers and hairy feathers (fiber feathers).

The feather base is hollow, which can reduce the weight of the bird and increase its strength.

Design experiments to study feathers in your own hands!

Question 1: What do feathers look like?

Covered on the body surface, it is light, tough and slightly elastic.

Question 2: Are the feathers hollow? Why does it look like this?

Yes, because when a bird wants to fly, its feathers are empty to reduce the weight of flying.

What are the morphological characteristics of birds suitable for flight?

1. The outside of the bird's body is made of light and warm feathers. The feathers not only have a thermal insulation effect, but also give the bird a streamlined appearance. It receives the least resistance when moving in the air, which is conducive to flying. When flying, two The wings continuously flap up and down, causing the airflow to generate huge downward pressure resistance, causing the bird to fly forward quickly.

2. The bones of birds are thin and light. The bones are hollow and filled with air. This unique structure of bird bones reduces the weight and enhances the ability to support flight.

3. Birds have very well-developed chest muscles and a unique respiratory system that is adapted to flying life. When a bird inhales once, its lungs can complete two gas exchanges during flight, ensuring that the bird can There is enough oxygen.

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"Flying Elf" Various Animals PPT Courseware 3:

"Flying Elf" Various Animal PPT Courseware 3 The body is covered with feathers: for heat preservation and flight. The forelimbs become wings: fan-like shapes adapted to fan the air. The feathers that play a major role in bird flight are ( ), and the down jackets we wear are filled with ( ). Quick facts: ..

"Flying Elf" various animal PPT courseware:

"Flying Elf" a variety of animal PPT courseware. Think about it: What animal can be called a flying elf? Discussion and exchange: What are the characteristics of the wings of the three animals? Bat wings: composed of the membrane between the forelimbs, hindlimbs, and tail, the body...

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Update Time: 2024-11-18

This template belongs to science courseware Hunan Education Edition Fourth Grade Science Volume 1 industry PPT template

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