Determine Whether the Study Depicts an Observational Study or an Experiment

question 88

Multiple Choice

Determine whether the study depicts an observational study or an experiment
-A scientist was studying the effects of a new fertilizer on crop yield. She randomly assigned half of the plots ona farm to group one and the remaining plots to group two. On the plots in group one, the new fertilizer wasused for a year. On the plots in group two, the old fertilizer was used. At the end of the year the average cropyield for the plots in group one was compared with the average crop yield for the plots in group two.

• A) experiment
• B) observational study

---

Definitions:

Texas Horned Lizard

A species of lizard native to the southern United States, characterized by its distinctive horns and ability to squirt blood from its eyes as a defense mechanism.

Invasive Species

Non-native organisms that spread widely and cause harm to the environment, economy, or health in a new area.

Primary Succession

A new community becomes established in an area where there was previously no soil.

Mosses And Lichens

These are diverse groups of non-vascular and composite organisms, respectively, that thrive in moist environments. Mosses are small, green, non-vascular plants, while lichens are symbiotic associations between fungi and photosynthetic algae or cyanobacteria.