Question

1. which of the following is an experiment in which a person can easily control a variable?

a. observe the behavior of ants and other environmental factors around anthills.
b. tell whether it rained on wednesday for an entire month.
c. count the number of insects in a piece of ground measuring 1 m square.
d. determine whether plants grow better in full sunshine or partial sunlight.

Explanation:

• Option a: Observing ant behavior and environmental factors around anthills is mainly observation, not an experiment with controlled variables as environmental factors are hard to control.
• Option b: Telling if it rained on Wednesdays for a month is just data collection (observation of a natural event), no variable control.
• Option c: Counting insects in a 1m² area is a survey/observation, no variable manipulation.
• Option d: Determining if plants grow better in full or partial sunlight involves controlling the independent variable (sunlight exposure) and observing the dependent variable (plant growth), so it's an experiment with controlled variables.

Answer:

d. Determine whether plants grow better in full sunshine or partial sunlight.