The answer is 3. Conclusions must be based on the original hypothesis made. It must support or answer the hypothesis given. It can either agree or disagree with the hypothesis.

3

The answer is 4. Since there are only two results to conclude, heads or tails, having to consider the surface of the coin wherein it landed could conclude a better result to see if they have a 50 50 chance or is it affected by the surface of the land.

4

The answer is 4. Since in the observed experiment, they have noticed that the penetration of the soil increases the development of the roots, the experiment must prove that this is actually true by relying on the aerated pumps connected.

4

The hypothesis being tested here is the increase in development of plant roots by the penetration of air into the soil.

One way this experiment can be improved if there would be a recorded time of the process of development.

If a frog was given food in a container with a high and low temperature, then it would make a difference in its breathing cycles and beating of the heart.

The answer is 2. The other choices are wrong because at a low temperature, frogs will eat less food and use less oxygen because there wouldn’t be much activity when the temperature is low.

2

The answer is 4. The independent variable is the pH of solution. It is the factor in a research wherein the researcher manipulates it in order to achieve different results. It is used to test the effect it has on the dependent variable.

4

The independent variable in this experiment is the change in pH values. The independent variable is the pH of a solution. It is the factor in research wherein the researcher manipulates it in order to achieve different results. It is used to test the effect it has on the dependent variable.

pH and relative activity

Enzyme activity at various pH

The answer is 1. As seen in the data or graph plotted, we can see that the greatest recorded enzyme activity is at pH 8 with an enzyme activity of 50.

1