"Bread is Moldy" Food PPT Download

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"Bread is Moldy" Food PPT Download

Part One: New Knowledge Explanation

1. Observe moldy bread

Bread becomes moldy because a type of mold grows on it

Observation experiment requirements

Observe the appearance and color of the mold on the bread.

Be careful when observing!

Pay attention to hygiene during observation and use tweezers to pick up food.

After the observation, immediately return to the group to communicate. The recorder will take notes in time and send a representative to the stage to report.

1. Mold under a magnifying glass

2. Mold under the microscope

2. Conditions for bread to become moldy

Student discussion:

1. How does mold grow on bread?

2. What factors are related to moldy bread?

Guess: related to water, temperature...

Experiment: Which piece of bread mold grows faster?

1. Prepare two pieces of dry bread (use a toothpick to put some mold on each piece of bread), keep the first piece of bread dry, put 10 drops of water on the second piece of bread, and put them in two plastic bags respectively. Tie the mouth of the bag tightly with thread and place it on the table.

2. Prepare two pieces of dry bread (use a toothpick to put some mold on each piece of bread), add 10 drops of water to both, put them in two plastic bags respectively, tie the mouth of the bag tightly with a thread and put it on the table for the first time. Place one piece of bread in the refrigerator and keep the second piece of bread at warm room temperature.

Bread is moldy PPT, part 2: consolidation practice

1. Choice

1. ( ) Mold grows relatively quickly.

A. Dry bread on the table

B. Trendy bread on the table

C. Stylish bread in the refrigerator

D. Moist bread placed in a higher temperature place

2. As shown in the picture, the bread is hairy and smelly because ( ) grows on it.

A. Bacteria B. Mold C. Parasite

3. Place three identical pieces of bread in the following three environments. The one most likely to mold is ().

A low temperature, dry B, warm, moist C, warm, dry

2. Judgment

1. If a corner of the bread becomes moldy, just cut off the moldy part and the rest can still be eaten. ( )

2. The mold produced during the moldy process of food contains substances harmful to the human body, so moldy and spoiled food must not be eaten. ( )

3. An environment with very low temperature is not conducive to the growth of mold. ( )

Bread is moldy PPT, part 3 content: Class summary

1. Observe moldy bread

2. Conditions for bread to become moldy

high temperature, humidity

Keywords: Free download of Chinese PPT courseware for the second volume of the fourth grade in the textbook edition, download of moldy bread PPT, download of food PPT, .PPT format;

For more information about the PPT courseware "Food Bread Moldy", please click the Food PPT Bread Moldy ppt tag.

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Update Time: 2024-10-05

This template belongs to science courseware Fourth Grade Science Volume 2, Textbook Edition industry PPT template

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