What does it mean that biological experiment variables are not the same?

1. Variables: conditions that are artificially altered or altered in a set of controlled trials;

2. For example, when the seeds germinate under environmental conditions, the seeds are submerged in order to prevent the seeds from coming into contact with the air, and the variable is air; The purpose of the seeds that are not watered is to keep the seeds from touching the water, and the variable is water, of course, the variable is not unique.

3. Under normal circumstances, there must be a control group and an experimental group in a group of control experiments, but sometimes there can also be two experimental groups, for example, if the organ that verifies transpiration is a leaf, then the two experimental groups will be more obvious in order to contrast; Sometimes there is no control, or a blank control, such as verifying that the product of photosynthesis is oxygen;

In junior high school, controlled trials are relatively simple, as long as you are good at accumulation and comparison, you will slowly find a pattern.

The variable is the degree to which the factors in the experiment change. The variables are different, and in order to minimize the influence of other factors, the experiment is carried out by a single variable, so that the results are more intuitive. However, large experiments with multivariate variables must be statistically processed.

Environmental conditions for seed germination: temperature, humidity, air, moisture. You just have more water and less water, and the temperature, humidity and air conditions of the environment are the same.

Of course, there is a control group to verify the control experiment.

The so-called variable is the quantity that only changes, and only this one quantity changes under the condition that other conditions are unchanged, so that it can be seen that the effect of this quantity on the whole, and the variable is different in the agreement ** problem, two quantities have been changed at the same time, so that it is impossible to determine which one has what effect, control a quantity change, and the others are exactly the same.

Controlling a single variable ...

Only this one will change, that is, the amount of water will change, more or less.

You know.

Variables in the control group versus the experimental group.

Let's take an example.

A: Place a seed in a moist, air-barren, 25-degree environment B: Place a seed in a moist, air-sufficient, 1-degree environment to demonstrate the conditions for seed germination.

In this case, temperature is the only variable.

And the conditions under which the seed germinates are the result of a test requirement.

Got it??

Agree with what was said upstairs!! Bonus points!! Hahaha.

The amount you control is called the independent variable. **The effect of different temperatures on enzyme activity should be set at different temperatures, and temperature is an independent variable.

pH is not related to the topic you are studying, it is an irrelevant variable. We want to avoid the influence of extraneous variables on the experiment, so the pH should be the same for each group.

The dependent variable is the amount that changes because the independent variable changes. For example, y=x+4, where x is the independent variable and y is the dependent variable.

The effect of temperature on enzyme activity, which varies with temperature, is the dependent variable.

Answer A, the temperature change will change the rate of activity of the enzyme, and the rate will change, and the corresponding activity products will change! The products after enzyme activity are generally acidic or alkaline, and the amount determines the pH value.

Variables can also be the type of enzyme decomposed product, the number of catalysts, the number of enzymes!!

It should be the time when the c** temperature changes the enzyme activity, and this is the temperature that you want to change, so it must be changed by you.

Although pH has an effect on the activity of the enzyme, it has nothing to do with the effect of the temperature you want to ** on the activity of the enzyme here, so this value should be kept the same for each sample, so it is an irrelevant variable.

In this experiment, the activity of the enzyme is what you have to observe, that is, the dependent variable, of course, the activity is very abstract, and the reaction is the decrease in the concentration of the substrate or the increase in the concentration of the product, these are the phenomena that are easy to observe, and the factors that will affect the experimental data are the factors that you have to control and keep them constant.

To control a variable is to control an irrelevant variable. Specifically, for independent variables, only a single variable is generally studied at the high school level. Follow the single-variable principle. A truly complex experiment can have multiple variables that are correlated, and there is no single variable.

There is no need to think too deeply in high school.

It's obviously light.

Because if there are more than three levels, you can't say whether there is or not.

For example, there are three gradients of light intensity, which are 10,000 lux, 20,000 lux, and 30,000 lux. Can you still say "with or without light"?

1. Whether the variable is written as "xx" or "with or without xx".

Answer: (with or without xx).

2Plant A should be placed in the light, and plant B should be placed in a dark place.

Should the variable be "lighting" or "presence or absence of lighting"?

Answer: (with or without light).

When you say "variable", you should mean an independent variable.

Variables are not just a matter of presence or absence, but more often than not, they should be quantitative changes. For example, in your example, there are only two treatments, "with or without light", but in the experiment, there may be other different treatments such as "strong light" and "weak light", so it is not accurate to say "with or without light".

And when we just say "light", we can't tell if your variables are light intensity, light duration, or whatever. For example, if you set up three treatments in the experiment, "strong light", "weak light" and "dark", the independent variable is "light intensity".

Can you understand that?

Variables are written as "xx" (personal opinion).

The premise is that this is a controlled trial, and here are two sets of almost identical experimental setups, with only one difference. Refers to variables, which are the differences between the two experimental setups.

Let's use character-type variables to illustrate, for example, the character variable a, when defined, the system allocates a certain amount of memory to variable, the value in the memory is uncertain, you can give a complex value (the value of the character type) at will, for example, a='f', and the variable can be modified after the complex value. The value of a constant cannot be modified.

For example, observation and validation experiments do not need to be used: such as observing mitochondria and chloroplasts, detecting sugars, lipids, proteins, etc. in biological tissues, and observing the distribution of DNA and RNA in cells, etc., do not need to design variables, while ** experiments such as conditions that affect enzyme activity generally need to design variables.

No, for example, observation and validation experiments do not need to be used to observe mitochondria and chloroplasts, to detect sugars, lipids, proteins, etc. in biological tissues, and to observe the distribution of DNA and RNA in cells, etc., there is no need to set up variables, and experiments such as conditions that affect enzyme activity generally need to design variables.

For the most part, a control group was set up first, and then the factors studied by Brother Mori were used as variables for experiments, and only one amount of variation could be changed at a time, but observational experiments such as organelle observation or pigment diffusion were not used.

The principle of (control variable or single variable) in biological experiments means that in a specific experiment, except for the variable to be studied, all other variables should be the same and controlled in an appropriate state.