"Basic Methods of Biological Research" PPT download

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"Basic Methods of Biological Research" PPT download

Part One: Discussion and Information

Review questions

1. What four representative scientists did we study in the last class? What were the results of their research?

2. What are their research methods?

student discussion

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. Think about what markings rattlesnakes might use to track their prey?

Profile information

1. A rattlesnake has poor eyesight. His 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 2 content: Design experimental plan:

Experiment 1: A rat that was poisoned by a rattlesnake was dragged out of a snake hole and dragged a long distance along a preset curved path.

Experiment 2: A dead rat that had not been attacked by a rattlesnake was dragged along a preset curved path for a long distance.

Experiment implementation and recording

Experiment 1: It was observed that the rattlesnake's head slowly moved left and right, while its tongue rapidly stretched and flicked. Then, it crawled along the path set by the scientists, and finally tracked down the poisoned dead rat. .

Experiment 2: It was discovered that the rattlesnake did not pursue the dead rat.

get conclusion

Rattlesnakes track injured prey based on the scent of their venom.

Basic methods of biological research PPT, part 3: problem study

1. Discover and raise issues

Please use short sentences to accurately express the questions you raised from the perspective of the relationship between organisms and the environment. The question you ask is: Does light affect the life of the Rat Woman?

2. Collect information related to the problem

Rat women, also known as "woodworms", use their gills to breathe, and their gills can only operate in a moist environment, so they live in humid places.

They need to live in a moist, warm and sheltered place. They stay diurnal and come out at night. They have negative phototaxis. Light has a great impact on the life of rat women.

3. Make assumptions

Based on this information, please provide a tentative explanation for the questions you raised. This is a hypothesis. Your hypothesis is: light affects the rat woman's life.

Hypothesis: The questions discovered and raised during the observation, after reviewing the data and thinking,

You'll come up with various tentative explanations for the problem, and that's the hypothesis. (Textbook page 30)

4. Design experimental plan

The environmental factors that you are exploring that affect the distribution of rat women are___________;

The experimental factor you studied is __________, and the control condition is __________.

Basic methods of biological research PPT, part 4: after-class exercises

1. What kind of prey can rattlesnakes hunt ( )

A. live unbitten rat

B． A rat bitten or killed by it

C. The mouse that was not bitten to death by it

D. All three of the above will work

2. How do rattlesnakes track prey ( )

A. Hearing b. Vision c. Sense of smell D. body temperature

3. How many dead mice are needed in an experimental design to study rattlesnakes preying on mice ( )

A. One B. Two C. Three D. No limit to quantity

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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.

"Basic Methods of Biological Research" PPT courseware:

"Basic Methods of Biological Research" PPT courseware Part 1: Situation introduction According to the teacher's requirements, search for and capture rat women in the community or campus where you live. When you captured the rat women, what kind of environment did you find the rat women living in? The outstanding features of this environment are...

"Basic Methods of Biological Research" PPT:

"Basic Methods of Biological Research" PPT Part One Content: Situation Introduction 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. , not...

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Update Time: 2024-07-31

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

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