"Basic Methods of Biological Research" PPT

Description

"Basic Methods of Biological Research" PPT

Part One: Situation Import

When scientists were observing and studying rattlesnakes in the forest, they discovered a strange phenomenon: after the rattlesnake captures its prey, its fangs will quickly inject venom into the prey, and instead of swallowing the prey immediately, it will let the prey escape. After some time, the rattlesnake returns to pursue and devour its prey. What markings do rattlesnakes use to track down poisoned prey?

learning target

1. Try to design a simple experiment and control the experimental conditions.

2. Summarize the general steps of the experimental research process.

Basic methods of biological research PPT, part 2 content: Exploration topic one

How does a rattlesnake track down prey it lets loose?

The rattlesnake is a venomous snake. About 2 meters long. The body is greenish-yellow with diamond-shaped dark brown spots. There is a horny ring at the end of the tail, which makes sounds when it moves, so it is called a rattlesnake. Distributed in North America. There are also similar species in South America.

Thoughts and Discussions

After a rattlesnake captures its prey, its fangs will quickly inject venom into the prey. Instead of swallowing the prey immediately, it will let the prey escape. After a period of time, the rattlesnake will pursue and devour the prey again. Please think about this. , what markings might rattlesnakes use to track down poisoned prey?

Profile information

1. The rattlesnake has poor vision. Its eyes can only detect visible light but cannot see objects clearly.

2. There is a pair of heat-sensing structures under the eyes of rattlesnakes, which can sense the body temperature of nearby animals.

3. The rattlesnake’s tongue can sense the smell in the air.

4. An animal that has not been bitten by a rattlesnake cannot trigger the rattlesnake's tracking behavior.

Basic methods of biological research PPT, part three content: exploration topic two

General steps for studying organisms experimentally

student discussion

What was the only difference between the two dead mice in the experiment? Why design a dead rat that hasn’t been attacked by a rattlesnake?

Experimental research steps

1. Discover and ask questions

After a rattlesnake captures its prey, it first lets the prey escape, and then pursues and devours the prey. What markings might the rattlesnake use to pursue its prey?

2. Gather information relevant to the problem

Collect and read 4 information related to rattlesnakes

3. Make assumptions

Rattlesnakes hunt prey based on the smell of their venom

4. Design experimental plan

Scientists design 2 controlled experiments

5. Implement experiments and record them

Scientists conduct 2 controlled experiments and record the experimental phenomena

Basic methods of biological research PPT, part 4: training to meet standards

1. Study the method used by rattlesnakes to track prey ( )

A. Survey method B. Experimental method C. Observation method D. Classification method

2. Briefly describe the experimental method to study how rattlesnakes track their prey.

Experimental program:

(1) Drag a dead rat that has been attacked by a rattlesnake from a snake hole and drag it along a pre-set ___________ for a long distance.

(2) Conduct the experiment according to the design of (1) on a dead rat that has not been attacked by a rattlesnake.

Experimental results: The process _____ the rattlesnake pursued the dead rat, the process _____ the rattlesnake did not pursue the dead rat.

Conclusion of the experiment: Rattlesnakes pursue dead rats based on ___________.

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For more information about the PPT courseware "Exploring the Basic Methods of Biological Research of Life", please click the "Exploring the Basic Methods of Biological Research of Life ppt" tab.

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Update Time: 2024-09-03

This template belongs to biology courseware Beijing Normal University Edition Seventh Grade Biology Volume 1 industry PPT template

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