"Who Choose Them" Biological Diversity PPT Download

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"Who Choose Them" Biological Diversity PPT Download

Part One Content: New Course Teaching

The Frog's Departure and Stay

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.

First row: Two male and female green frogs with stripes on their skin living in green fields mate and give birth to offspring. The skin color of their offspring generally shows four different traits.

Second row: A bird is eating a yellow frog among their offspring. This describes the fact that because it lives in a green field, the yellow color is quite different from the surrounding green, so it is easily discovered by natural enemies and eaten.

Third row: offspring frogs with different skin colors. A bird is eating a green frog, indicating that the environment has changed from fields to deserts. Green frogs are easily discovered by natural enemies, leaving mostly yellow frogs.

nature chose them

The choice of frogs is the result of natural selection. The foxes with different looks living in different places are also the result of natural selection.

When biologists compared individual organisms in different places, they discovered a very interesting phenomenon. That is, the same organism becomes larger in cold places and its body becomes more round; its nose, ears, legs, etc. are exposed. The organs on the outside are smaller.

Choice changes living things

From the appearance of simple life forms on the earth 3.8 billion years ago to the rich and colorful life world today, changes in the earth's environment are an important reason. Humans also played an important role in changing the living environment of organisms and domesticating some animals.

Who chose them PPT, part two: expansion and extension

Phenology is the science that studies the relationship between seasonal phenomena of plants and animals in nature and cyclical changes in the environment. It mainly observes and records phenomena such as the growth and prosperity of plants, the migration and reproduction of animals, and changes in the environment throughout the year.

Class summary

Changes in the environment select and change organisms, and organisms form a variety of morphological structures due to changes in the living environment. Human beings also change organisms according to their own needs and enrich biological diversity.

Who chose them PPT, Part 3: Classroom exercises

1. Fill in the blanks

1. ( ) has caused changes in living things, and ( ) has also enriched the diversity of species.

2. ( ) changes, the morphological structure of organisms will also change.

3. The same kind of creature lives in different places, and its body shape and structure will also change ( ).

2. Judgment questions

1. Just like a mother cat and a father cat give birth to kittens of different colors, the offspring of frogs also have different body colors. ( )

2. The appearance of yellow frogs is the result of natural selection. Foxes with different looks living in different places are also the result of natural selection. ( )

3. Gray foxes live in southern America. ( )

Who chose them PPT, Part 4: Homework

Collect information on how biological characteristics have been changed by natural selection and artificial selection.

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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: 2024-09-09

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

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