To solve this problem, we need to match the items in List I with the appropriate descriptions in List II related to the digestive system of a cockroach. Let's analyze each item:$\newline\newline \bullet\$The structures used for storing food:$\newline$In cockroaches, the crop is the structure used for storing food.$\newline$This matches with IV. Crop.$\newline\newline \bullet\$Gizzard:$\newline$The gizzard is a muscular structure used for grinding food.$\newline$This matches with I. The structures used for grinding the food.$\newline\newline \bullet\$Ring of 6-8 blind tubules at junction of foregut and midgut:$\newline$These are known as gastric caeca, which secrete digestive enzymes.$\newline$This matches with II. Gastric Caeca.$\newline\newline \bullet\$Ring of 100-150 yellow coloured thin filaments at junction of midgut and hindgut:$\newline$These are Malpighian tubules, which are involved in excretion and osmoregulation.$\newline$This matches with III. Malpighian tubules.$\newline\newline$Now, let's match the items from List I with List II:$\newline$I. The structures used for storing food$\rightarrow$IV. Crop$\newline$II. Gizzard$\rightarrow$I. The structures used for grinding the food$\newline$III. Ring of 6-8 blind tubules at junction of foregut and midgut$\rightarrow$II. Gastric Caeca$\newline$IV. Ring of 100-150 yellow coloured thin filaments at junction of midgut and hindgut$\rightarrow$III. Malpighian tubules$\newline \textbf{This corresponds to Option 3:} I \rightarrow IV, II \rightarrow I, III \rightarrow II, IV \rightarrow III.$