Well, first of all, the word BIODEGRADABLE refers to subsatnces, mostly organic substances which are easily decomposed by living organisms. However, the question says that the corn plastics are biodegradable, which means they decompose. So i believe the answer to this is that the corn plastics decompose faster than the regular plastics. So basically, the answer should be;
This means that plastics made from corn will DECOMPOSE FASTER than regular plastics. Hope i helped. Have a nice day.