"Who Choose Them" Biological Diversity PPT Teaching Courseware

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"Who Choose Them" Biological Diversity PPT Teaching Courseware

Part 1: Importing new lessons

The dinosaur family that once dominated the earth has disappeared, but the little praying mantis of the same era still lives on the earth. What determines the fate of life on Earth?

Who chose them PPT, part 2: new lesson learning

Just like a mother cat and a father cat give birth to kittens of different colors, so do the offspring of frogs. In the fields, green frogs are retained because of their good camouflage, while frogs of other colors are too conspicuous and are eaten by predators. The environment changes, green grass dies, and fields turn into deserts. Green frogs are extremely conspicuous on the yellow sand and are easily spotted by predators. In this way, the yellow frogs will be retained in future generations, and the frogs here will become mainly yellow frogs in the future. The emergence of yellow frogs is the result of natural selection.

Observe the foxes living in different environments in the picture. What are their different characteristics?

Natural selection, survival of the fittest.

When biologists compared living individuals in different places, they discovered an interesting phenomenon. That is, the colder the place where the same creature lives, the larger the individual is, the closer the shape is to a round shape, and the nose, ears, legs, etc. are exposed. The organs on the outside are smaller.

Small experiment: Can the arctic fox's round and large body really cool down slowly?

Choose 2 spherical flasks of different sizes, 1 glass bottle with a similar volume to the large beaker, and 3 thermometers. Put hot water of the same temperature into three containers at the same time. Use a thermometer to measure and observe which container's water temperature drops slowly.

Who chose them PPT, part three: conclusion summary

1. The same creature living in different places will have different body shapes and structures.

2. As the environment changes, the morphological structure of organisms will also change.

3． Natural selection and artificial selection change organisms and create biological diversity.

Who chose them PPT, Part 4: Classroom exercises

(1) Multiple choice questions

1. The main reason why wild animals become poultry and livestock is ( )

A. Changes in the natural environment B. Artificial domestication C. Animals’ own choices

2. The reason why giraffes’ necks become longer is ( )

A. In order to eat the leaves on the top of the tree B. In order to escape from enemies C. Those with short necks and small stature could not adapt to the environment at that time and were eliminated; while those with long necks adapted to the surrounding environment and survived.

(2) Judgment questions

1. Green frogs tend to survive in grass. ( )

2. Arctic foxes are smaller than gray foxes. ( )

3． Barnyard grass is more productive than rice. ( )

Who chose them PPT, Part 5: Homework assignments

Collect information on how natural selection and artificial selection change biological characteristics and communicate with the class.

Keywords: Free download of Chinese PPT courseware for the sixth grade in the textbook version, who chose them PPT download, biological diversity PPT download, .PPT format;

For more information about the PPT courseware "The Diversity of Biology Who Chooses Them", please click the Diversity of Biology ppt Who Chooses Them ppt tag.

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Update Time: 2024-11-10

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 1 industry PPT template

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