A botany student counted 11 blades of grass in one square centimeter of lawn and measured the lawn as a rectangle 61 m by 31 m. She reported that there were 208,010,000 blades of grass in the lawn. The precision of her conclusion:

the answer is A. correctly represents her measurements.

20801000

D. Excessive given her measurements

This statement is correct. The precision of her conclusion is represented by the reported value of 208,010,000 blades of grass in the lawn. It indicates that she counted the blades of grass accurately and provided a precise estimate of the total number of blades in the given lawn area.

To determine the precision of the botany student's conclusion, we need to compare her reported number of blades of grass to the actual number of blades of grass in the lawn, based on her measurements.

First, we need to calculate the area of the lawn using the given dimensions:
Area of lawn = length × width = 61 m × 31 m = 1891 m²

Next, we need to calculate the number of square centimeters in the lawn:
Number of square centimeters in the lawn = Area of lawn × 10,000 (since there are 10,000 square centimeters in 1 square meter)
Number of square centimeters in the lawn = 1891 m² × 10,000 = 18,910,000 square centimeters

If the botany student counted 11 blades of grass in one square centimeter of lawn, then the total number of blades of grass in the lawn can be calculated as:
Total number of blades of grass in the lawn = Number of square centimeters in the lawn × 11
Total number of blades of grass in the lawn = 18,910,000 square centimeters × 11 = 208,010,000 blades of grass

Therefore, the botany student's conclusion is precise because it accurately represents her measurements. The reported number of 208,010,000 blades of grass matches the calculated number based on her measurements, indicating that her conclusion is correct.