Final answer:
The statement is false. Greater absorption efficiency in biological systems is associated with increased surface area, as seen with the microvilli in the small intestine. Absorptive surfaces are more indicative of a perfect blackbody. so, option 2 is the correct answer.
Step-by-step explanation:
The statement that 'The absorptive surface would become more efficient at its job and shrink' is false. In biological systems, particularly when considering organs like the small intestine, greater efficiency in absorption is typically associated with an increased surface area. For example, absorptive cells that line the small intestine have projections called villi and microvilli that greatly increase surface area to aid in the absorption of nutrients. This increased surface area allows for more contact with digested food, thus improving the efficiency of absorption.
Regarding the concept of a perfect blackbody, absorptive surfaces more closely model a perfect blackbody. A blackbody is an idealized physical body that absorbs all incident electromagnetic radiation. An absorptive surface would not reflect much light and would be a better model of a blackbody compared to a reflective surface.