What effect does sound have on photosynthesis in plant leaves?

As animals, it is not only us humans who are sensitive to sound (except for those with ear diseases), poultry and wild animals are even more sensitive in this regard. So some friends asked, does sound have any effect on plants?

Well, you know what, this sound really does have an impact on the photosynthesis of plant leaves. Friends who are interested can try it by themselves. Here are the experimental steps.

The first part is the experimental design, the second part is the materials, and the third part is the test.

01. Experimental Design

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In any case, controlling variables to set controls is one of the keys to experimental design. One variable, two experiments; two variables, four experiments…

1. To study the effect of sound on plants

The same lighting conditions, either all darkness or all daylight

2. If you want to study the effects of different sounds on plants, such as chaotic noise, DJ or classical music, etc.

3. If you want to add design

+ means yes, - means no

Other things you can research include:

Loudness: The size of a sound that people feel subjectively (commonly known as volume), which is determined by the "amplitude" and the distance between people and the sound source. The larger the amplitude, the louder the loudness, and the smaller the distance between people and the sound source, the louder the loudness. (Unit: decibel dB)

Pitch: The high or low pitch of a sound (high or low) is determined by the "frequency". The higher the frequency, the higher the pitch (frequency unit is Hz (hertz), Hertz[/url, the human ear's hearing range is 20 to 20,000 Hz. Sounds below 20 Hz are called infrasound, and sounds above 20,000 Hz are called ultrasound). For example, sounds at the bass end or higher sounds, such as the sound of a thin string.

Frequency is the number of sound waves that pass a given point per second and is measured in the unit called Hertz, named after Heinrich Rudolf Hertz, who set up a table to demonstrate how frequency is related to cycles per second.

One kilohertz or 1000 Hz means that there are 1000 cycles of the sound wave passing by a given point per second, one megahertz means there are 1,000,000 cycles per second, and so on.

Timbre: Also known as timbre, the waveform determines the timbre of the sound. Sound has different characteristics due to the characteristics of different materials. Timbre itself is an abstract thing, but the waveform is the intuitive expression of this abstraction. Different timbres have different waveforms. Typical timbre waveforms include square waves, sawtooth waves, sine waves, pulse waves, etc. Different timbres can be distinguished by waveforms.

Musical sound: regular, pleasing sound. Noise: from the perspective of physics, the sound produced by a sound-producing body when it vibrates irregularly; from the perspective of environmental protection, any sound that interferes with people's normal work, study and rest, as well as any sound that interferes with the sound people want to hear.

02. Test samples

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Test sample: The most common plant test sample is Arabidopsis thaliana, which is a model plant and is used in most standard biological laboratories.

If you don't have any, you can use geranium, which is available everywhere.

03. Detection Method

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From easy to difficult

1. Starch detection: Starch is produced by photosynthesis, and it turns blue when it comes into contact with iodine.

2. Measure weight. Photosynthesis will affect weight, so an analytical balance is required.

3. Detecting oxygen or carbon dioxide levels is more difficult

4. Detecting chlorophyll is even more difficult...

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Okay, that’s basically it, have you learned it?