"Bacteria" PPT courseware

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"Bacteria" PPT courseware

Part One: Observing Bacteria

Bacteria are very tiny individuals. A pile of about 1 billion bacteria would only be as big as a millet.

Please observe

These are several forms of bacteria observed under a microscope. Please observe them carefully and try to classify them.

The following is a schematic diagram of the bacterial structure. Please observe it carefully and fill in the name of the structure.

Flagella (some species of bacteria have them)

cytoplasm

Capsule (some species of bacteria have it)

cell wall

cell membrane

Part Two: Skills Training

Calculation: Suppose there are 100 bacteria on your hands at the moment, and the bacteria reproduce at a rate of one generation every 30 minutes. If you do not wash your hands, what will be the number of bacteria on your hands after 4 hours? What does this teach you about personal hygiene?

100X28=25600 (pieces)

Develop good personal hygiene habits, wash hands, bathe, and change clothes frequently to reduce the number of bacteria you carry and the possibility of getting sick from bacterial infection.

Part Three: Case Studies

The ability of spores to resist harsh environments may be higher than we imagine. There is a true thing:

Before humans landed on the moon, the United States launched an artificial satellite to the moon that carried a television camera. Two and a half years later, the American Apollo 12 spacecraft arrived at the moon, and the astronauts brought this camera back. Under strict sterile conditions, a small plastic isolation plate of the camera was placed in the nutrient solution. After a few hours of observation, strings of streptococci were found in the culture solution. It reproduces once every 25 minutes, so it can be inferred that at least one streptococcus is living on this camera. Before humans landed on the moon, this streptococcus bacteria actually lived in such a harsh environment on the moon without eating or drinking for two and a half years! We have to admire the ability of bacteria to survive!

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Update Time: 2024-11-23

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template

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