"Insect World under a Magnifying Glass" Tiny World PPT download

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"Insect World under a Magnifying Glass" Tiny World PPT download

Part One: Exploring New Knowledge

(1) Unusual body structure

When a fly lands on a vertical smooth glass, it not only does not slip off, but can also crawl on it. This is related to the structure of its feet.

The distal pads of the fly's feet are hairy and secrete mucus.

The eyes of insects are divided into single eyes and compound eyes. The compound eyes are on both sides above the head.

Observing under a magnifying glass, you can see that the compound eye is composed of many small eyes, each of which is a hexagon.

Different insects have different numbers of ommatidia

Dragonflies have 10,000 to 280,000 small eyes, and they can see objects of 1 to 2 meters.

Butterflies have 12,000 to 17,000 small eyes.

(2) Aphids and their natural enemies - lacewings

Aphids are a common and very harmful pest. Their bodies are only as big as the eye of a needle. The general shape of their bodies can only be seen clearly under a 10x magnifying glass.

They often gather on the twigs of plants to suck their juices

Female aphids giving birth to baby aphids. Aphids can directly give birth to small aphids from the female without mating between male and female. This method of reproduction is called parthenogenesis.

observation report

Use a magnifying glass to observe that the lacewing larvae grabs an aphid with the pair of "sickles" in front of its mouth, then pierces the aphid's body and sucks its juice. After only more than 20 seconds, the lacewing larvae sucks the aphid. Only an empty shell is left, and then it hugs another aphid. You can also see that lacewing larvae carry the empty shells of aphids on their bodies to disguise themselves, which is very interesting.

PPT of the insect world under a magnifying glass, part 2: expansion and extension

The larger the viewing angle, the larger the image, and the more detailed the object can be distinguished. Moving objects can increase the angle of view, but is limited by the eye's ability to adjust focus. Hold a magnifying glass close to your eye and place the object within its focus, creating an upright virtual image.

Class summary

Through observation of the insect world, we know that using a magnifying glass tool can observe many details that are invisible to the naked eye.

PPT of the insect world under a magnifying glass, part three: classroom training

1. Fill in the blanks

1. When a fly lands on a vertical smooth glass, it not only does not slide off, but can also crawl on it. This is related to ( ).

2. ( ) is a common and very harmful pest. Its body is so small that you need a magnifying glass to see its general shape.

2. Multiple choice questions

1. House flies have ( ) small eyes.

A.3000 B.4000 C.30000 D.40000

2. Insect ears have various shapes, and their positions on the body are not fixed. The auditory hairs of cockroaches grow in ( )

A.Inside of foot B.Recess between chest and abdomen

C. On the tail whiskers D. On the antennae

The world of insects under a magnifying glass PPT, Part 4: Homework

After class, continue to observe the living habits of certain insects and make notes.

Keywords: Free download of Chinese PPT courseware for the second volume of the sixth grade in the textbook edition, PPT download of the insect world under the magnifying glass, PPT download of the tiny world, .PPT format;

For more information about the PPT courseware "The World of Insects under the Magnifying Glass of the Tiny World", please click the "The World of Insects under the Magnifying Glass of the Tiny World ppt" ppt tag.

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Update Time: 2024-11-16

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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