Answer: It's an EXPERIMENT
Explanation: Experiment is done when we apply anything to a samples or conditions in other to study another sample or conditions.
Observation is done when, we study samples or conditions in it's natural way, without application of anything that may alter it's result.
Because the researcher has applied fertilizer to one side and did not apply to the other side, that means he has performed an experiment. Since he wasn't observing the two sample in it's natural way without any external application.
High use of fertilizers and pesticides leading to degradation in the fertility of the level of the soil.
<u>Explanation:</u>
Green revolution was started with the aim of increasing the level of production of the farm and to bring in new and innovative ways and methods to increase the productivity.
This helped the farmers to increase their yield and there fore their income for their survival. But with these positive effects, it also had some negative effects like there was excessive use of pesticides and fertilizers due to which the level of fertility of the soil degraded and fell down.
I think that the answer is B
<span>In contrast with correlational research, experimental research allows cause-and-effect conclusions. This is because experimental research limits the number of independent variables to one variable, so we know that the independent variable has an effect on the dependent variable. In correlational research the independent variable is not limited to one, so while we know there is a correlation between the independent and dependent variable, we don't know that it caused it. An example is that on a rainy day we see a people carrying umbrellas. However, the correlation between people carrying umbrellas and the rain does not mean the people carrying the umbrellas caused the rain.</span>
