"Who Choose Them" Biological Diversity PPT Courseware 4

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"Who Choose Them" Biological Diversity PPT Courseware 4

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?

Looking at the two frogs in the picture, what kind of environment might they live in?

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.

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.

Can we speculate on the differences in the environments in which these three species of foxes live? Three types of foxes live in different environments. What are the possible reasons?

Nature (that is, the environment) changes living things.

summary

Nature (changes in the environment) changes and selects organisms, and organisms form a variety of morphological structures due to changes in the living environment.

do you think so?

After being raised in captivity by humans, wild boars and wild ducks have become domestic pigs and ducks, and their bodies show different characteristics;

Crucian carp has been transformed into an ornamental goldfish through human cultivation and selection, and obvious changes have been found in its physical characteristics;

Hybrid rice is created by artificially crossing barnyard grass (wild rice) and rice;

Wheat and wheat are artificially bred into hybrid wheat.

Class summary

1. The same kind of creature lives in different places, and its body shape and structure will also be different.

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

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

1. True or False Questions (mark √ if correct, × if incorrect)

1. Green frogs are easy to survive in the grass. ( )

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

3. Barnyard grass has a higher yield than rice. ( )

4. The evolution of organisms is the result of artificial cultivation and screening. ( )

5. Environmental changes are the main cause of animal evolution. ( )

2. 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. The animal’s own choice

2. The reason why the giraffe’s neck becomes longer is ( )

A. In order to eat the leaves on the tree tops 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.

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For more information about the PPT courseware "Biological Diversity Who Chooses Them", please click the Biological Diversity PPT Who Chooses Them PPT tag.

"Who Choose Them" Biodiversity PPT teaching courseware:

"Who Choose Them" PPT Teaching Courseware on Biological Diversity Part One: Introduction of New Lessons The family of dinosaurs that once dominated the earth has perished, but the little mantis of the same era still lives on the earth. What determines the fate of life on earth? ..

"Who Choose Them" Biological Diversity PPT Download:

"Who Choose Them" Biological Diversity PPT Download Part One: New Course Lecture: The Departure and Residence of Frogs What kind of environment might they live in? Just like a mother cat and a father cat give birth to kittens of different colors, the offspring of frogs also have different colors...

"Who Choose Them" Biological Diversity PPT:

"Who Choose Them" Biological Diversity PPT Part One: The Go and Stay of Frogs Observe two frogs, what kind of environment might they live in? Just like a mother cat and a father cat give birth to kittens of different colors, the offspring of frogs also have different colors...

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Update Time: 2024-07-02

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

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