In animals (including humans), the food we eat is broken apart into the glucose molecules used in cellular respiration. Since plants don’t “eat,” their glucose comes from another source.

Question

Use the graph to determine how plants get glucose.

A line graph showing the change in plant glucose levels over a 24-hour period. The y-axis shows plant glucose levels and the x-axis shows the time of day, from 2:00 AM to 12:00 PM. The glucose levels peak around 2:00 PM and decline to almost zero by 8:00 PM.

A
Plants break down rocks into glucose

B
Plants make glucose from sunlight

C
Plants absorb glucose from the soil

D
Plants collect glucose from animals

Answer 1

Based on the information provided in your description of the graph, the peak in plant glucose levels around 2:00 PM suggests a process that is likely related to photosynthesis, which occurs during the day when there is sunlight. Therefore, the correct answer is:

B: Plants make glucose from sunlight.

Plants utilize sunlight, along with water and carbon dioxide, to produce glucose through the process of photosynthesis.